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Publisher: Springer-Verlag (Total: 2348 journals)

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Showing 1 - 200 of 2348 Journals sorted alphabetically
3D Printing in Medicine     Open Access   (Followers: 1)
3D Research     Hybrid Journal   (Followers: 21, SJR: 0.222, CiteScore: 1)
4OR: A Quarterly J. of Operations Research     Hybrid Journal   (Followers: 10, SJR: 0.825, CiteScore: 1)
AAPS J.     Hybrid Journal   (Followers: 22, SJR: 1.118, CiteScore: 4)
AAPS PharmSciTech     Hybrid Journal   (Followers: 7, SJR: 0.752, CiteScore: 3)
Abdominal Imaging     Hybrid Journal   (Followers: 15, SJR: 0.866, CiteScore: 2)
Abhandlungen aus dem Mathematischen Seminar der Universitat Hamburg     Hybrid Journal   (Followers: 4, SJR: 0.439, CiteScore: 0)
Academic Psychiatry     Full-text available via subscription   (Followers: 24, SJR: 0.53, CiteScore: 1)
Academic Questions     Hybrid Journal   (Followers: 8, SJR: 0.106, CiteScore: 0)
Accreditation and Quality Assurance: J. for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 26, SJR: 0.316, CiteScore: 1)
Acoustical Physics     Hybrid Journal   (Followers: 11, SJR: 0.359, CiteScore: 1)
Acoustics Australia     Hybrid Journal   (SJR: 0.232, CiteScore: 1)
Acta Analytica     Hybrid Journal   (Followers: 7, SJR: 0.367, CiteScore: 0)
Acta Applicandae Mathematicae     Hybrid Journal   (Followers: 1, SJR: 0.675, CiteScore: 1)
Acta Biotheoretica     Hybrid Journal   (Followers: 4, SJR: 0.284, CiteScore: 1)
Acta Diabetologica     Hybrid Journal   (Followers: 18, SJR: 1.587, CiteScore: 3)
Acta Endoscopica     Hybrid Journal   (Followers: 1)
acta ethologica     Hybrid Journal   (Followers: 4, SJR: 0.769, CiteScore: 1)
Acta Geochimica     Hybrid Journal   (Followers: 6, SJR: 0.24, CiteScore: 1)
Acta Geodaetica et Geophysica     Hybrid Journal   (Followers: 2, SJR: 0.305, CiteScore: 1)
Acta Geophysica     Hybrid Journal   (Followers: 10, SJR: 0.312, CiteScore: 1)
Acta Geotechnica     Hybrid Journal   (Followers: 7, SJR: 1.588, CiteScore: 3)
Acta Informatica     Hybrid Journal   (Followers: 5, SJR: 0.517, CiteScore: 1)
Acta Mathematica     Hybrid Journal   (Followers: 12, SJR: 7.066, CiteScore: 3)
Acta Mathematica Hungarica     Hybrid Journal   (Followers: 2, SJR: 0.452, CiteScore: 1)
Acta Mathematica Sinica, English Series     Hybrid Journal   (Followers: 6, SJR: 0.379, CiteScore: 1)
Acta Mathematica Vietnamica     Hybrid Journal   (SJR: 0.27, CiteScore: 0)
Acta Mathematicae Applicatae Sinica, English Series     Hybrid Journal   (SJR: 0.208, CiteScore: 0)
Acta Mechanica     Hybrid Journal   (Followers: 21, SJR: 1.04, CiteScore: 2)
Acta Mechanica Sinica     Hybrid Journal   (Followers: 5, SJR: 0.607, CiteScore: 2)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 7, SJR: 0.576, CiteScore: 2)
Acta Meteorologica Sinica     Hybrid Journal   (Followers: 3, SJR: 0.638, CiteScore: 1)
Acta Neurochirurgica     Hybrid Journal   (Followers: 6, SJR: 0.822, CiteScore: 2)
Acta Neurologica Belgica     Hybrid Journal   (Followers: 1, SJR: 0.376, CiteScore: 1)
Acta Neuropathologica     Hybrid Journal   (Followers: 5, SJR: 7.589, CiteScore: 12)
Acta Oceanologica Sinica     Hybrid Journal   (Followers: 3, SJR: 0.334, CiteScore: 1)
Acta Physiologiae Plantarum     Hybrid Journal   (Followers: 2, SJR: 0.574, CiteScore: 2)
Acta Politica     Hybrid Journal   (Followers: 14, SJR: 0.605, CiteScore: 1)
Activitas Nervosa Superior     Hybrid Journal   (SJR: 0.147, CiteScore: 0)
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 7, SJR: 0.103, CiteScore: 0)
ADHD Attention Deficit and Hyperactivity Disorders     Hybrid Journal   (Followers: 23, SJR: 0.72, CiteScore: 2)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 9)
Administration and Policy in Mental Health and Mental Health Services Research     Partially Free   (Followers: 16, SJR: 1.005, CiteScore: 2)
Adsorption     Hybrid Journal   (Followers: 4, SJR: 0.703, CiteScore: 2)
Advances in Applied Clifford Algebras     Hybrid Journal   (Followers: 4, SJR: 0.698, CiteScore: 1)
Advances in Atmospheric Sciences     Hybrid Journal   (Followers: 37, SJR: 0.956, CiteScore: 2)
Advances in Computational Mathematics     Hybrid Journal   (Followers: 19, SJR: 0.812, CiteScore: 1)
Advances in Contraception     Hybrid Journal   (Followers: 3)
Advances in Data Analysis and Classification     Hybrid Journal   (Followers: 52, SJR: 1.09, CiteScore: 1)
Advances in Gerontology     Partially Free   (Followers: 8, SJR: 0.144, CiteScore: 0)
Advances in Health Sciences Education     Hybrid Journal   (Followers: 28, SJR: 1.64, CiteScore: 2)
Advances in Manufacturing     Hybrid Journal   (Followers: 3, SJR: 0.475, CiteScore: 2)
Advances in Polymer Science     Hybrid Journal   (Followers: 44, SJR: 1.04, CiteScore: 3)
Advances in Therapy     Hybrid Journal   (Followers: 5, SJR: 1.075, CiteScore: 3)
Aegean Review of the Law of the Sea and Maritime Law     Hybrid Journal   (Followers: 6)
Aequationes Mathematicae     Hybrid Journal   (Followers: 2, SJR: 0.517, CiteScore: 1)
Aerobiologia     Hybrid Journal   (Followers: 3, SJR: 0.673, CiteScore: 2)
Aesthetic Plastic Surgery     Hybrid Journal   (Followers: 9, SJR: 0.825, CiteScore: 1)
African Archaeological Review     Hybrid Journal   (Followers: 16, SJR: 0.862, CiteScore: 1)
Afrika Matematika     Hybrid Journal   (Followers: 1, SJR: 0.235, CiteScore: 0)
AGE     Hybrid Journal   (Followers: 7)
Ageing Intl.     Hybrid Journal   (Followers: 7, SJR: 0.39, CiteScore: 1)
Aggiornamenti CIO     Hybrid Journal   (Followers: 1)
Aging Clinical and Experimental Research     Hybrid Journal   (Followers: 3, SJR: 0.67, CiteScore: 2)
Agricultural Research     Hybrid Journal   (Followers: 5, SJR: 0.276, CiteScore: 1)
Agriculture and Human Values     Hybrid Journal   (Followers: 14, SJR: 1.173, CiteScore: 3)
Agroforestry Systems     Hybrid Journal   (Followers: 20, SJR: 0.663, CiteScore: 1)
Agronomy for Sustainable Development     Hybrid Journal   (Followers: 12, SJR: 1.864, CiteScore: 6)
AI & Society     Hybrid Journal   (Followers: 8, SJR: 0.227, CiteScore: 1)
AIDS and Behavior     Hybrid Journal   (Followers: 14, SJR: 1.792, CiteScore: 3)
Air Quality, Atmosphere & Health     Hybrid Journal   (Followers: 4, SJR: 0.862, CiteScore: 3)
Akupunktur & Aurikulomedizin     Full-text available via subscription   (Followers: 1)
Algebra and Logic     Hybrid Journal   (Followers: 6, SJR: 0.531, CiteScore: 0)
Algebra Universalis     Hybrid Journal   (Followers: 2, SJR: 0.583, CiteScore: 1)
Algebras and Representation Theory     Hybrid Journal   (Followers: 1, SJR: 1.095, CiteScore: 1)
Algorithmica     Hybrid Journal   (Followers: 9, SJR: 0.56, CiteScore: 1)
Allergo J.     Full-text available via subscription   (Followers: 1, SJR: 0.234, CiteScore: 0)
Allergo J. Intl.     Hybrid Journal   (Followers: 2)
Alpine Botany     Hybrid Journal   (Followers: 5, SJR: 1.11, CiteScore: 3)
ALTEX : Alternatives to Animal Experimentation     Open Access   (Followers: 3)
AMBIO     Hybrid Journal   (Followers: 10, SJR: 1.569, CiteScore: 4)
American J. of Cardiovascular Drugs     Hybrid Journal   (Followers: 16, SJR: 0.951, CiteScore: 3)
American J. of Community Psychology     Hybrid Journal   (Followers: 28, SJR: 1.329, CiteScore: 2)
American J. of Criminal Justice     Hybrid Journal   (Followers: 7, SJR: 0.772, CiteScore: 1)
American J. of Cultural Sociology     Hybrid Journal   (Followers: 16, SJR: 0.46, CiteScore: 1)
American J. of Dance Therapy     Hybrid Journal   (Followers: 4, SJR: 0.181, CiteScore: 0)
American J. of Potato Research     Hybrid Journal   (Followers: 2, SJR: 0.611, CiteScore: 1)
American J. of Psychoanalysis     Hybrid Journal   (Followers: 21, SJR: 0.314, CiteScore: 0)
American Sociologist     Hybrid Journal   (Followers: 12, SJR: 0.35, CiteScore: 0)
Amino Acids     Hybrid Journal   (Followers: 8, SJR: 1.135, CiteScore: 3)
AMS Review     Partially Free   (Followers: 4)
Analog Integrated Circuits and Signal Processing     Hybrid Journal   (Followers: 7, SJR: 0.211, CiteScore: 1)
Analysis and Mathematical Physics     Hybrid Journal   (Followers: 5, SJR: 0.536, CiteScore: 1)
Analysis in Theory and Applications     Hybrid Journal   (Followers: 1)
Analysis of Verbal Behavior     Hybrid Journal   (Followers: 5)
Analytical and Bioanalytical Chemistry     Hybrid Journal   (Followers: 32, SJR: 0.978, CiteScore: 3)
Anatomical Science Intl.     Hybrid Journal   (Followers: 2, SJR: 0.367, CiteScore: 1)
Angewandte Schmerztherapie und Palliativmedizin     Hybrid Journal  
Angiogenesis     Hybrid Journal   (Followers: 3, SJR: 2.177, CiteScore: 5)
Animal Cognition     Hybrid Journal   (Followers: 19, SJR: 1.389, CiteScore: 3)
Annales françaises de médecine d'urgence     Hybrid Journal   (Followers: 1, SJR: 0.192, CiteScore: 0)
Annales Henri Poincaré     Hybrid Journal   (Followers: 3, SJR: 1.097, CiteScore: 2)
Annales mathématiques du Québec     Hybrid Journal   (Followers: 4, SJR: 0.438, CiteScore: 0)
Annali dell'Universita di Ferrara     Hybrid Journal   (SJR: 0.429, CiteScore: 0)
Annali di Matematica Pura ed Applicata     Hybrid Journal   (Followers: 1, SJR: 1.197, CiteScore: 1)
Annals of Biomedical Engineering     Hybrid Journal   (Followers: 18, SJR: 1.042, CiteScore: 3)
Annals of Combinatorics     Hybrid Journal   (Followers: 4, SJR: 0.932, CiteScore: 1)
Annals of Data Science     Hybrid Journal   (Followers: 12)
Annals of Dyslexia     Hybrid Journal   (Followers: 10, SJR: 0.85, CiteScore: 2)
Annals of Finance     Hybrid Journal   (Followers: 30, SJR: 0.579, CiteScore: 1)
Annals of Forest Science     Hybrid Journal   (Followers: 7, SJR: 0.986, CiteScore: 2)
Annals of Global Analysis and Geometry     Hybrid Journal   (Followers: 1, SJR: 1.228, CiteScore: 1)
Annals of Hematology     Hybrid Journal   (Followers: 15, SJR: 1.043, CiteScore: 2)
Annals of Mathematics and Artificial Intelligence     Hybrid Journal   (Followers: 12, SJR: 0.413, CiteScore: 1)
Annals of Microbiology     Hybrid Journal   (Followers: 11, SJR: 0.479, CiteScore: 2)
Annals of Nuclear Medicine     Hybrid Journal   (Followers: 4, SJR: 0.687, CiteScore: 2)
Annals of Operations Research     Hybrid Journal   (Followers: 10, SJR: 0.943, CiteScore: 2)
Annals of Ophthalmology     Hybrid Journal   (Followers: 11)
Annals of Regional Science     Hybrid Journal   (Followers: 7, SJR: 0.614, CiteScore: 1)
Annals of Software Engineering     Hybrid Journal   (Followers: 13)
Annals of Solid and Structural Mechanics     Hybrid Journal   (Followers: 9, SJR: 0.239, CiteScore: 1)
Annals of Surgical Oncology     Hybrid Journal   (Followers: 13, SJR: 1.986, CiteScore: 4)
Annals of Telecommunications     Hybrid Journal   (Followers: 9, SJR: 0.223, CiteScore: 1)
Annals of the Institute of Statistical Mathematics     Hybrid Journal   (Followers: 1, SJR: 1.495, CiteScore: 1)
Antonie van Leeuwenhoek     Hybrid Journal   (Followers: 5, SJR: 0.834, CiteScore: 2)
Apidologie     Hybrid Journal   (Followers: 4, SJR: 1.22, CiteScore: 3)
APOPTOSIS     Hybrid Journal   (Followers: 8, SJR: 1.424, CiteScore: 4)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2, SJR: 0.294, CiteScore: 1)
Applications of Mathematics     Hybrid Journal   (Followers: 2, SJR: 0.602, CiteScore: 1)
Applied Biochemistry and Biotechnology     Hybrid Journal   (Followers: 43, SJR: 0.571, CiteScore: 2)
Applied Biochemistry and Microbiology     Hybrid Journal   (Followers: 17, SJR: 0.21, CiteScore: 1)
Applied Cancer Research     Open Access  
Applied Categorical Structures     Hybrid Journal   (Followers: 2, SJR: 0.49, CiteScore: 0)
Applied Composite Materials     Hybrid Journal   (Followers: 49, SJR: 0.58, CiteScore: 2)
Applied Entomology and Zoology     Partially Free   (Followers: 4, SJR: 0.422, CiteScore: 1)
Applied Geomatics     Hybrid Journal   (Followers: 3, SJR: 0.733, CiteScore: 3)
Applied Geophysics     Hybrid Journal   (Followers: 8, SJR: 0.488, CiteScore: 1)
Applied Intelligence     Hybrid Journal   (Followers: 12, SJR: 0.6, CiteScore: 2)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 4, SJR: 0.319, CiteScore: 1)
Applied Mathematics & Optimization     Hybrid Journal   (Followers: 6, SJR: 0.886, CiteScore: 1)
Applied Mathematics - A J. of Chinese Universities     Hybrid Journal   (SJR: 0.17, CiteScore: 0)
Applied Mathematics and Mechanics     Hybrid Journal   (Followers: 5, SJR: 0.461, CiteScore: 1)
Applied Microbiology and Biotechnology     Hybrid Journal   (Followers: 64, SJR: 1.182, CiteScore: 4)
Applied Physics A     Hybrid Journal   (Followers: 9, SJR: 0.481, CiteScore: 2)
Applied Physics B: Lasers and Optics     Hybrid Journal   (Followers: 24, SJR: 0.74, CiteScore: 2)
Applied Psychophysiology and Biofeedback     Hybrid Journal   (Followers: 8, SJR: 0.519, CiteScore: 2)
Applied Research in Quality of Life     Hybrid Journal   (Followers: 12, SJR: 0.316, CiteScore: 1)
Applied Solar Energy     Hybrid Journal   (Followers: 18, SJR: 0.225, CiteScore: 0)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 5, SJR: 0.542, CiteScore: 1)
Aquaculture Intl.     Hybrid Journal   (Followers: 23, SJR: 0.591, CiteScore: 2)
Aquarium Sciences and Conservation     Hybrid Journal   (Followers: 1)
Aquatic Ecology     Hybrid Journal   (Followers: 34, SJR: 0.656, CiteScore: 2)
Aquatic Geochemistry     Hybrid Journal   (Followers: 4, SJR: 0.591, CiteScore: 1)
Aquatic Sciences     Hybrid Journal   (Followers: 13, SJR: 1.109, CiteScore: 3)
Arabian J. for Science and Engineering     Hybrid Journal   (Followers: 5, SJR: 0.303, CiteScore: 1)
Arabian J. of Geosciences     Hybrid Journal   (Followers: 2, SJR: 0.319, CiteScore: 1)
Archaeological and Anthropological Sciences     Hybrid Journal   (Followers: 20, SJR: 1.052, CiteScore: 2)
Archaeologies     Hybrid Journal   (Followers: 12, SJR: 0.224, CiteScore: 0)
Archiv der Mathematik     Hybrid Journal   (Followers: 1, SJR: 0.725, CiteScore: 1)
Archival Science     Hybrid Journal   (Followers: 60, SJR: 0.745, CiteScore: 2)
Archive for History of Exact Sciences     Hybrid Journal   (Followers: 7, SJR: 0.186, CiteScore: 1)
Archive for Mathematical Logic     Hybrid Journal   (Followers: 3, SJR: 0.909, CiteScore: 1)
Archive for Rational Mechanics and Analysis     Hybrid Journal   (SJR: 3.93, CiteScore: 3)
Archive of Applied Mechanics     Hybrid Journal   (Followers: 5, SJR: 0.79, CiteScore: 2)
Archives and Museum Informatics     Hybrid Journal   (Followers: 142, SJR: 0.101, CiteScore: 0)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 5, SJR: 1.41, CiteScore: 5)
Archives of Dermatological Research     Hybrid Journal   (Followers: 7, SJR: 1.006, CiteScore: 2)
Archives of Environmental Contamination and Toxicology     Hybrid Journal   (Followers: 14, SJR: 0.773, CiteScore: 2)
Archives of Gynecology and Obstetrics     Hybrid Journal   (Followers: 16, SJR: 0.956, CiteScore: 2)
Archives of Microbiology     Hybrid Journal   (Followers: 8, SJR: 0.644, CiteScore: 2)
Archives of Orthopaedic and Trauma Surgery     Hybrid Journal   (Followers: 8, SJR: 1.146, CiteScore: 2)
Archives of Osteoporosis     Hybrid Journal   (Followers: 2, SJR: 0.71, CiteScore: 2)
Archives of Sexual Behavior     Hybrid Journal   (Followers: 10, SJR: 1.493, CiteScore: 3)
Archives of Toxicology     Hybrid Journal   (Followers: 17, SJR: 1.541, CiteScore: 5)
Archives of Virology     Hybrid Journal   (Followers: 5, SJR: 0.973, CiteScore: 2)
Archives of Women's Mental Health     Hybrid Journal   (Followers: 14, SJR: 1.274, CiteScore: 3)
Archivio di Ortopedia e Reumatologia     Hybrid Journal  
Archivum Immunologiae et Therapiae Experimentalis     Hybrid Journal   (Followers: 2, SJR: 0.946, CiteScore: 3)
ArgoSpine News & J.     Hybrid Journal  
Argumentation     Hybrid Journal   (Followers: 5, SJR: 0.349, CiteScore: 1)
Arid Ecosystems     Hybrid Journal   (Followers: 2, SJR: 0.2, CiteScore: 0)
Arkiv för Matematik     Hybrid Journal   (Followers: 1, SJR: 0.766, CiteScore: 1)
Arnold Mathematical J.     Hybrid Journal   (Followers: 1, SJR: 0.355, CiteScore: 0)
Arthropod-Plant Interactions     Hybrid Journal   (Followers: 2, SJR: 0.839, CiteScore: 2)
Arthroskopie     Hybrid Journal   (Followers: 1, SJR: 0.131, CiteScore: 0)
Artificial Intelligence and Law     Hybrid Journal   (Followers: 11, SJR: 0.937, CiteScore: 2)
Artificial Intelligence Review     Hybrid Journal   (Followers: 15, SJR: 0.833, CiteScore: 4)
Artificial Life and Robotics     Hybrid Journal   (Followers: 9, SJR: 0.226, CiteScore: 0)
Asia Europe J.     Hybrid Journal   (Followers: 5, SJR: 0.504, CiteScore: 1)
Asia Pacific Education Review     Hybrid Journal   (Followers: 12, SJR: 0.479, CiteScore: 1)
Asia Pacific J. of Management     Hybrid Journal   (Followers: 16, SJR: 1.185, CiteScore: 2)
Asia-Pacific Education Researcher     Hybrid Journal   (Followers: 12, SJR: 0.353, CiteScore: 1)
Asia-Pacific Financial Markets     Hybrid Journal   (Followers: 2, SJR: 0.187, CiteScore: 0)
Asia-Pacific J. of Atmospheric Sciences     Hybrid Journal   (Followers: 19, SJR: 0.855, CiteScore: 1)
Asian Business & Management     Hybrid Journal   (Followers: 9, SJR: 0.378, CiteScore: 1)
Asian J. of Business Ethics     Hybrid Journal   (Followers: 9)
Asian J. of Criminology     Hybrid Journal   (Followers: 5, SJR: 0.543, CiteScore: 1)
AStA Advances in Statistical Analysis     Hybrid Journal   (Followers: 3, SJR: 0.548, CiteScore: 1)
AStA Wirtschafts- und Sozialstatistisches Archiv     Hybrid Journal   (Followers: 5, SJR: 0.183, CiteScore: 0)
ästhetische dermatologie & kosmetologie     Full-text available via subscription  

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Journal Cover
Accreditation and Quality Assurance: Journal for Quality, Comparability and Reliability in Chemical Measurement
Journal Prestige (SJR): 0.316
Citation Impact (citeScore): 1
Number of Followers: 26  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 0949-1775 - ISSN (Online) 1432-0517
Published by Springer-Verlag Homepage  [2348 journals]
  • Correction to: Measurement uncertainty: requirements set in the
           accreditation standards
    • Authors: Kyriacos C. Tsimillis
      Pages: 253 - 253
      Abstract: Unfortunately, the references 12 and 13 were incorrectly published in the original publication. The correct references are:
      PubDate: 2018-08-01
      DOI: 10.1007/s00769-018-1323-y
      Issue No: Vol. 23, No. 4 (2018)
       
  • Application of post-column reaction GC for accurate and direct
           determination of musty odor substances in standard solution
    • Authors: Yuko Kitamaki; Naoki Saito; Masahiko Numata; Toshihide Ihara
      Abstract: By using post-column reaction GC, a method for accurate and direct characterization of musty odor substances (2-methylisoborneol and geosmin) in a candidate standard solution has been developed. Because the GC system gives a response depending on the number of carbon atoms constituting the organic compound by combustion and conversion to methane, naphthalene and diethyl phthalate, purity of which had been accurately assessed, were used as reference materials for calibration. To verify the method, concentrations of 2-methylisoborneol and geosmin in the sample determined by the method were compared with the concentrations calculated based on gravimetric mixing that is one of the general methods for the characterization of the organic standard solutions. The analytical results of each analyte obtained by the two methods agreed within a deviation of about 0.5 % or less.
      PubDate: 2018-08-06
      DOI: 10.1007/s00769-018-1338-4
       
  • Congresses, conferences, workshops and courses
    • PubDate: 2018-07-24
      DOI: 10.1007/s00769-018-1340-x
       
  • Taking laboratory uncertainties into account in the Hampel estimator
    • Abstract: According to ISO/IEC 17025:2017, testing and calibration laboratories should apply procedures for estimating measurement uncertainty. It would thus make sense to include these uncertainty estimates in the evaluation of laboratory performance in proficiency testing. According to ISO 13528:2015, submitted laboratory-specific uncertainties can be taken into account in the assessment of the performance of PT participants by means of \(\zeta\) (or \(E_{n}\) ) scores. It is important to note, however, that the laboratory uncertainties are not taken into account in the actual estimation of consensus means. In this paper, a proposal for a modification of the Hampel estimator is presented. In the original Hampel estimator, the laboratory weights are determined on the basis of a single reference quantity (e.g. \(\sigma_{\text{pt}}\) ). In the modified estimator, this single reference quantity is replaced by the laboratory-specific uncertainties. Thus, all available information is taken into consideration in the estimation of the consensus mean, ensuring a greater level of reliability. Moreover, since \(\sigma_{\text{pt}}\) is no longer needed in the computation of the consensus mean, the requirements regarding minimum participant numbers can be relaxed.
      PubDate: 2018-07-18
      DOI: 10.1007/s00769-018-1332-x
       
  • Evaluation of the reproducibility standard deviation in the pesticide
           multi-residue methods on olive oil from past proficiency tests
    • Authors: Patrizia Stefanelli; Tiziana Generali; Silvana Girolimetti; Danilo Attard Barbini
      Abstract: The data reported in the frame of proficiency testing (PT) exercises organized from 2007 to 2016 have been statistically re-evaluated using Algorithm A of the ISO 13528:2015, and the relative standard deviation for reproducibility of multi-residue methods for the determination of pesticides in olive oil was evaluated. Usually, the assigned between-laboratories variability in PTs on pesticide residues is fixed/set to 25 %. This value was compared to the calculated robust relative standard deviation (RRSD). A total of 1527 analytical results were collected in the ten PTs for the determination of pesticides in olive oil. An RRSD of 21 % was obtained, below the maximum value of 25 %. If all participants use the same analytical approach (e.g., multi-residue method and same instrumental technique), a lower value of the reproducibility standard deviation should be expecting. The QuEChERS method, coupled with LC–MS/MS and GC–MS/MS, has become an important methodology for the analysis of pesticide residues. This is due to its simplicity, the use of low quantities of acetonitrile, the possibility to analyze a large number of pesticides with fewer steps and high efficiency. This method may harmonize the future of pesticide residue analyses. Recently, it was successfully applied to the analysis of olive oil by 70 % of the laboratories participating to our last PT exercise. An expanded uncertainty of 50 % was systematically applied in Europe since 2006 for the analyses of pesticides; the use of the QuEChERS methodology may reduce to 40 %. This work could contribute to promote the comparability of measurements of pesticide residues in foodstuffs.
      PubDate: 2018-07-12
      DOI: 10.1007/s00769-018-1330-z
       
  • Experience of the implementation of EA-4/18
    • Authors: Ian Mann
      Abstract: The standard ISO/IEC 17025 (sub-clause 5.9) requires that the validity of tests results is monitored by laboratories and one of the tools that can be used is the participation in proficiency testing (PT). To give guidance to accreditation bodies (ABs) on how to evaluate the level and frequency of participation in PT and to assist laboratories in determining their own levels and frequency of participation, a guidance document, EA-4/18 (Guidance on the level and frequency of proficiency testing participation), was established in 2010 by the European Cooperation for Accreditation (EA). There has been various feedback from the analytical community in Europe suggesting that some laboratories have experienced mixed messages from different assessors as to the level and frequency of PT participation required and that there may be a lack of harmonization between accreditation bodies. Given the concerns raised, the EEE-PT (EA-Eurachem-Eurolab) WG undertook a survey, with the support of the EA Laboratory committee, to ascertain the experience from the EA accreditation bodies with implementing the guidance. The survey was sent to the EA full and associate members. The outcome of the survey showed that EA-4/18 is implemented in a harmonized way throughout the accreditation bodies, but the concept included in EA-4/18 can be difficult to understand. As there are no specific indications in EA-4/18, on the level and frequency of participation, the implementation by each laboratory of the concept found in EA-4/18 can vary, even if the laboratories are active in the same field. In the same way, different assessors can have different views on the strategy established by the laboratory, therefore leading to the impression that the laboratories are treated differently. A majority of ABs wish to revise EA-4/18 as it is considered as a helpful guidance, but more clarification of the concept and additional examples should be included in the revised version, if EA decides to do so.
      PubDate: 2018-07-12
      DOI: 10.1007/s00769-018-1337-5
       
  • Evaluation of implementation of good quality management practices related
           to the support processes in the laboratories of Moroccan faculties of
           sciences and techniques
    • Authors: Meriem Outaki; Ebrahim Kerak
      Abstract: The evaluation practices in the higher education in Morocco constitute a constitutional and legal requirement and also respond to the requirements of the national and international environment in perpetual evolution. To identify the level of application of good quality management practices related to the scientific research in Morocco, a questionnaire was administered to the research laboratories managers of the faculties of sciences and techniques on a national scale with a percentage of answer of 33 %. This paper concerns the evaluation of the implementation of theses good practices related to the support processes such as the management of material, human and informational resources. The results of this study showed the dissatisfaction of the majority of laboratories managers with regard to their availability. Besides, a minority of the laboratories respect practices related to the control of the function metrology and to the storage and the traceability of reagents. More than two-thirds managers asserted that their research teams are established on the basis of the affinities of the thematic of research of the researchers and are convinced of the homogeneity of the composition of the laboratory teams. This study emphasizes the necessity of increasing investment in the domain of scientific research to improve the availability of the resources. It is also necessary to sensitize the laboratory staff to the importance of the implementation and control of the metrology function to assure reliability of the research results.
      PubDate: 2018-07-10
      DOI: 10.1007/s00769-018-1336-6
       
  • Validation of an in-house measurement procedure for determination of
           selected priority hazardous substances in water and estimation of
           measurement uncertainty
    • Authors: Marijana Kragulj Isakovski; Jelena Molnar Jazić; Snežana Maletić; Aleksandra Tubić; Jasmina Agbaba; Jelena Tričković; Božo Dalmacija
      Abstract: This study investigates measurement procedure validation for the determination of hexachlorobenzene, pentachlorobenzene and trifluralin as priority hazardous pesticides in water with suspended solids  < 12 mg/L by liquid–liquid extraction with hexane and gas chromatography with electron capture detector analysis. Two water matrices were used: synthetic matrix and a natural matrix—Danube surface water. Limit of detection was in the range 2.2 ng/L–3.9 ng/L. Trueness expressed as recovery was determined at pesticide concentrations of 20 ng/L and 50 ng/L in both water matrices. The intermediate precision was determined as relative standard deviations (RSD) and represents an agreement between replicates. Trueness was 72 %–121 % with RSD < 20 %. Expanded uncertainty of measurement was similar for all compounds (33.3 %–37.5 %) with a 95 % confidence level, for coverage factor k = 2. The validity of the measurement procedure was confirmed by participation in a PT Scheme with satisfactory z -score smaller than 2. Based on these results, it can be concluded that this low-cost measurement procedure is fit for the intended use measurements.
      PubDate: 2018-07-07
      DOI: 10.1007/s00769-018-1334-8
       
  • Preparation of items for a textile proficiency testing scheme
    • Authors: Juana Isabel Ferreiro López-Riobóo; Natalia Crespo González; Purificación López Mahía; Soledad Muniategui Lorenzo; Dario Prada Rodríguez
      Abstract: One of the fundamental stages in planning and developing any interlaboratory comparison is the selection and preparation of the test items to be distributed to the participants. In the case of compositional testing of textile materials, it is essential (1) to correctly identify the nature of the fibres which composes the fabric and (2) to check the homogeneity of the each test item. The Galician Laboratory of Consumer Products organized a proficiency testing (PT) in 2016 for textile fibres. Initial preparatory work was carried out with the assistance of the University of A Coruña, to identify the nature of the textile fibres using several complementary techniques specified in ISO/TR 11827 (e.g. optical microscopy, scanning electron microscopy, solubility tests and infrared spectroscopy). The fibres were compared with those from reference fabrics which were supplied by the Institute of Textile Research and Industrial Cooperation of Terrassa (INTEXTER). After the complete identification of the fibres, an assessment of homogeneity of the fabrics was performed according to the requirements in ISO 13528. Subsequently, five PT items were distributed and analysed according to the requirements set by ISO 1833 parts 3, 4, 7, 11 and 12, respectively. Eighteen laboratories from nine countries reported results, and the statistical treatment of results was performed according to ISO 13528. The assigned values were established by consensus, while the uncertainties were evaluated using the Naji Plot.
      PubDate: 2018-07-03
      DOI: 10.1007/s00769-018-1325-9
       
  • A fitness for purpose approach to validation and verification of
           analytical measurements
    • Authors: M. Alvarez-Prieto; J. Jiménez-Chacón
      Abstract: Validation (and in some extension verification) are concepts often applied to analytical procedures (or methods). The new edition of ISO/IEC 17025 clearly distinguishes between them. However, the established practice in analytical chemistry is not in harmony with the definitions given in the International Vocabulary of Metrology. It is stressed that both concepts should be applied to the analytical process (i.e., the measurement) instead of to the written analytical procedure (or method). Formal new definitions of basic and complementary metrological characteristics are given in order to properly understand the concepts of metrological requirements (MRs), verification and validation, and how they should be applied in practice. Also, validation is conceptually linked to the intended use of results, that is, to make the correct decision with a given high probability. To understand the rationale behind these concepts, a logical flow diagram is discussed. The way to compare basic metrological characteristics and the previously obtained ones for verification, as well as how to compare them with MRs for validation is discussed. Conversion of product characteristics into MRs plays an important role in this latter case. Some general guidelines on extension (and depth) of verification and validation are offered. Some of the discussed ideas could be applied in other branches of metrology.
      PubDate: 2018-07-03
      DOI: 10.1007/s00769-018-1331-y
       
  • Influence of probability distribution in measurement uncertainty of
           plane-strain fracture toughness test
    • Authors: Daniel Antonio Kapper Fabricio; Carla Schwengber ten Caten; Lisiane Trevisan; Afonso Reguly
      Abstract: The evaluation of measurement uncertainty by testing laboratories has a direct impact on the interpretation of the results. In several cases, it is recommended to determine the measurement uncertainty by the Monte Carlo method (MCM), which considers the propagation of distributions rather than the propagation of uncertainty. Measurement uncertainty of plane-strain fracture toughness KIC test was evaluated through the MCM and an examination of the influence of the probability distribution on the uncertainty values was performed through analysis of variance (ANOVA). In addition, results were compared to those obtained by the Guide to the Expression of Uncertainty in Measurement (GUM). Results demonstrate the importance of using the Monte Carlo method for the evaluation of measurement uncertainty and confirm that the probability distribution of input data has a significant influence on the expanded uncertainty values obtained for the plane-strain fracture toughness test.
      PubDate: 2018-07-02
      DOI: 10.1007/s00769-018-1326-8
       
  • Characterisation of folic acid by mass balance versus quantitative NMR
    • Authors: Andrea Lodi; Cees-Jan Nap; Silvia Metzger-Maurer; Christelle Schwartzenberger
      Abstract: Two approaches were used to determine the mass fraction of a sample of folic acid, one indirect (mass balance) where the components other than folic acid were measured, and one direct, using quantitative nuclear magnetic resonance (qNMR). The procedures used for the mass balance were essentially those described in the European Pharmacopoeia monograph for folic acid. qNMR is a technique for quantifying the main component within an organic compound (Quantitative NMR (qNMR)—BIPM in https://www.bipm.org/en/bipm/chemistry/organic-analysis/qnmr/, Santosh and Raja in Trends Anal Chem 35:5–26, 2012), whereas mass balance quantifies its minor components. The results obtained with the two approaches are independent. In this study, their joint application generated information that was used in a more than complementary fashion. The mass balance characterisation, in particular the results obtained by liquid chromatography with ultraviolet detection (LC–UV), allowed to improve the accuracy of the qNMR result by subtracting the interfering contribution of a related structure impurity. On the other hand, qNMR enabled concluding that the non-uniform response of UV detection at a single wavelength was not critically biasing the LC–UV results. In the end, the mass fractions obtained by mass balance and qNMR were not that different. It is concluded that mass balance and qNMR may be not only complementary but also synergistic. It was also observed that access to monographs of the European Pharmacopoeia, when available, gives skilled analysts an important tool for improved substance characterisation.
      PubDate: 2018-06-28
      DOI: 10.1007/s00769-018-1327-7
       
  • Correction to: Motivations, benefits and challenges on ISO/IEC 17025
           accreditation of higher education institution laboratories
    • Authors: Inês Hexsel Grochau; Carla Schwengber ten Caten; Maria Madalena de Camargo Forte
      Abstract: Unfortunately, figure 3 was incorrectly published in the original publication and the correct version is updated here.
      PubDate: 2018-06-18
      DOI: 10.1007/s00769-018-1333-9
       
  • Results of the 16th proficiency test on the determination of pesticide
           residues in olive oil
    • Authors: Tiziana Generali; Patrizia Stefanelli; Silvana Girolimetti; Danilo Attard Barbini
      Abstract: The Italian National Reference Laboratory (NRL) for pesticide residues yearly organizes proficiency tests (PTs) on olive oil in cooperation with the International Olive Council, addressed to European laboratories (NRLs, official control laboratories, and private laboratories), involved in the National and European monitoring programs. The main aim of these PTs is to compare the performances of the laboratories in Mediterranean and European countries and to promote mutual acceptance of pesticide residue data regarding the analytical controls of olive oil. In this paper, a description of the last PT named COIPT-16 is presented. The test material consisted of a commercial olive oil spiked with six different pesticides. The assigned value of each analyte was determined as a consensus value based on the results of the participants calculated using Algorithm A of the ISO 13528:2015. As relative target standard deviation in the z score formula, the 25 % of the robust mean value was considered. The global performance of each participating laboratory was assessed by calculating the average of the squared z scores only for laboratories that have detected at least 80 % of the analytes present in sample achieving the sufficient scope as indicated in the initial protocol. Two compounds, alpha-endosulfan and beta-endosulfan have been analyzed again in this PTas in the previous PT to compare the performances of the laboratories whose supplied results both PTs. The quick, easy, cheap, effective, rugged, and safe methodology was used by the majority of laboratories corresponding to 64 % of participants.
      PubDate: 2018-06-14
      DOI: 10.1007/s00769-018-1329-5
       
  • Standardization and improvement program for creatinine measurement in
           human serum
    • Authors: H. Gasca-Aragon; M. Balderas-Escamilla; V. M. Serrano-Caballero; M. A. Avila-Calderon; A. G. Pabello-Poegner; R. Sierra-Amor; R. Ruiz-Arenas; A. M. Cueto-Manzano; L. Cortes-Sanabria; H. R. Martinez-Ramirez; G. Garcia-Garcia; M. Arce-Osuna; Y. Mitani-Nakanishi
      Abstract: Current practices, quality control systems and proficiency testing schemes in clinical laboratories are likely unable to detect intrinsic bias in the in vitro diagnostic kits for creatinine as characterized or applied. A standardization program for clinical laboratories to determine the concentration of creatinine in human serum prior to estimate the glomerular filtration rate (eGFR) was conducted by the Mexican Association for Prevention of Chronic Diseases (AMPEC) and CENAM in 2016. In this study, 21 public and private clinical laboratories participated voluntarily and contributed with results of 27 measurement methods. These results were used to build a set of specific bias models, respectively, and then applied by each laboratory to correct their new measurements. A two-stage study was conducted; the first stage consisted of a blind experiment using certified reference material (CRM) DMR-574a of creatinine in human serum at three levels. The participating laboratories measured all three CRMs samples under a proficiency testing protocol using their routine methods. Linear regression with error in variables was applied to modeling the participants’ measurement method. In the second stage, each laboratory measured the concentration of creatinine in serum in approximately 100 samples from ambulatory patients, obtaining a total sample of 2416 measurements; subsequently, eGFR was calculated. In most of the participating laboratories (97 %), significant creatinine measurement bias was observed. Diagnosis based only on the concentration of creatinine in serum showed that: 72 % of the cases were correct, 23 % underestimated the eGFR and 5 % overestimated the eGFR. Bias is induced in the eGFR if no correction is made.
      PubDate: 2018-06-12
      DOI: 10.1007/s00769-018-1316-x
       
  • Accurate determination of formaldehyde amount fraction in cylinders using
           mixtures of primary standards of formaldehyde in nitrogen prepared by a
           gravimetric permeation method
    • Abstract: A reliable method for the quantification of formaldehyde (HCHO) amount fractions is required, because the results of comparisons between individual techniques used for the quantification of HCHO amount fractions often disagree owing to unknown causes. One reliable method comprises the quantification of HCHO using working gas standards in which the HCHO amount fraction is linked to the International System of Units (SI). In this work, the SI traceability of HCHO amount fractions in mixtures of commercial HCHO in nitrogen in cylinders used as working gas standards was established by calibrating them against primary gas standard mixtures (mixtures of HCHO in N2), which were prepared by a permeation method and were traceable to SI. The expanded relative uncertainties (k = 2) of the amount fractions in the primary gas standard mixtures were less than 0.6 %. The quantitative values of the amount fractions in the working gas standards had relative expanded uncertainties (k = 2) of 0.7 %–0.9 %.
      PubDate: 2018-06-06
      DOI: 10.1007/s00769-018-1321-0
       
  • Congresses, conferences, workshops and courses
    • PubDate: 2018-06-04
      DOI: 10.1007/s00769-018-1324-x
       
  • Motivations, benefits and challenges on ISO/IEC 17025 accreditation of
           higher education institution laboratories
    • Abstract: Accreditation of laboratories from higher education institutions (HEI) according to ISO/IEC 17025 contributes to meeting national regulatory requirements and to the involvement of countries in foreign trade. Additionally, these laboratories can benefit from the introduction of quality concepts and practices. Worldwide, testing and calibration laboratories from HEI face several challenges toward accreditation. This paper presents and comments on the characteristics, motivations, benefits and challenges toward accreditation of HEI laboratories. Responses to questionnaires sent to accredited HEI laboratories in the American continent showed that the vast majority undertakes tests for external clients, uses standardized methods and performs tests other than those accredited. Institutional decisions, external clients and regulatory requirements were the main motivators for accreditation. Lack of financial resources and lack of personnel were considered the main difficulties, while a preexisting laboratory structure and a motivated staff, the main facilitators toward accreditation. The resulting data allow a better understanding of the characteristics and difficulties of these laboratories. Additionally, this paper aims the identification of strategies to overcome problems faced by laboratories in HEI and research institutes, in order to promote the increase of their accreditation globally.
      PubDate: 2018-05-25
      DOI: 10.1007/s00769-018-1317-9
       
  • Interferences, a neglected error source for clinical assays
    • Authors: Jan S. Krouwer
      Abstract: In clinical assays, interfering substances can cause large errors, which in turn can result in severe patient harm. Yet, perhaps because such errors are rare, not much attention is devoted to interferences. This is evident in specifications, which often focus on most, but not all of the results. Methods such as total error analysis, six sigma, and measurement uncertainty intervals are all useful but fail to properly account for interferences, and the Clinical Laboratory Standards Institute standard on interferences has misleading reporting advice. Suggestions are given to improve specifications, protocols, analyses, and reporting methods.
      PubDate: 2018-04-20
      DOI: 10.1007/s00769-018-1315-y
       
  • Report on the 40th meeting of ISO/REMCO
    • Authors: Angelique Botha; John Hammond; Hendrik Emons; Stéphane Sauvage
      Abstract: The 40th meeting of the Reference Material Committee of ISO, ISO/REMCO, was held in Berlin, Germany, from 26 to 29 June 2017, and was hosted by the Federal Institute for Materials Research and Testing (BAM) and the German Institute for Standardization (DIN). This report details and summarizes the discussions and findings of the associated group sessions, and meetings.
      PubDate: 2018-04-03
      DOI: 10.1007/s00769-018-1313-0
       
 
 
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