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  Subjects -> CHEMISTRY (Total: 886 journals)
    - ANALYTICAL CHEMISTRY (55 journals)
    - CHEMISTRY (619 journals)
    - CRYSTALLOGRAPHY (21 journals)
    - ELECTROCHEMISTRY (28 journals)
    - INORGANIC CHEMISTRY (43 journals)
    - ORGANIC CHEMISTRY (49 journals)
    - PHYSICAL CHEMISTRY (71 journals)

CHEMISTRY (619 journals)                  1 2 3 4 | Last

Showing 1 - 200 of 735 Journals sorted alphabetically
2D Materials     Hybrid Journal   (Followers: 14)
Accreditation and Quality Assurance: Journal for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 27)
ACS Catalysis     Hybrid Journal   (Followers: 44)
ACS Chemical Neuroscience     Hybrid Journal   (Followers: 22)
ACS Combinatorial Science     Hybrid Journal   (Followers: 23)
ACS Macro Letters     Hybrid Journal   (Followers: 26)
ACS Medicinal Chemistry Letters     Hybrid Journal   (Followers: 41)
ACS Nano     Hybrid Journal   (Followers: 295)
ACS Photonics     Hybrid Journal   (Followers: 14)
ACS Symposium Series     Full-text available via subscription  
ACS Synthetic Biology     Hybrid Journal   (Followers: 25)
Acta Chemica Iasi     Open Access   (Followers: 5)
Acta Chimica Slovaca     Open Access   (Followers: 2)
Acta Chimica Slovenica     Open Access   (Followers: 1)
Acta Chromatographica     Full-text available via subscription   (Followers: 9)
Acta Facultatis Medicae Naissensis     Open Access  
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 7)
Acta Scientifica Naturalis     Open Access   (Followers: 3)
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 8)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 9)
Adsorption Science & Technology     Open Access   (Followers: 6)
Advanced Functional Materials     Hybrid Journal   (Followers: 60)
Advanced Science Focus     Free   (Followers: 5)
Advances in Chemical Engineering and Science     Open Access   (Followers: 69)
Advances in Chemical Science     Open Access   (Followers: 18)
Advances in Chemistry     Open Access   (Followers: 22)
Advances in Colloid and Interface Science     Full-text available via subscription   (Followers: 19)
Advances in Drug Research     Full-text available via subscription   (Followers: 25)
Advances in Environmental Chemistry     Open Access   (Followers: 7)
Advances in Enzyme Research     Open Access   (Followers: 10)
Advances in Fluorine Science     Full-text available via subscription   (Followers: 9)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 16)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 12)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 26)
Advances in Nanoparticles     Open Access   (Followers: 15)
Advances in Organometallic Chemistry     Full-text available via subscription   (Followers: 17)
Advances in Polymer Science     Hybrid Journal   (Followers: 45)
Advances in Protein Chemistry     Full-text available via subscription   (Followers: 18)
Advances in Protein Chemistry and Structural Biology     Full-text available via subscription   (Followers: 20)
Advances in Quantum Chemistry     Full-text available via subscription   (Followers: 6)
Advances in Science and Technology     Full-text available via subscription   (Followers: 12)
African Journal of Bacteriology Research     Open Access  
African Journal of Chemical Education     Open Access   (Followers: 3)
African Journal of Pure and Applied Chemistry     Open Access   (Followers: 8)
Agrokémia és Talajtan     Full-text available via subscription   (Followers: 2)
Al-Kimia : Jurnal Penelitian Sains Kimia     Open Access  
Alkaloids: Chemical and Biological Perspectives     Full-text available via subscription   (Followers: 2)
AMB Express     Open Access   (Followers: 1)
Ambix     Hybrid Journal   (Followers: 3)
American Journal of Biochemistry and Biotechnology     Open Access   (Followers: 68)
American Journal of Biochemistry and Molecular Biology     Open Access   (Followers: 21)
American Journal of Chemistry     Open Access   (Followers: 31)
American Journal of Plant Physiology     Open Access   (Followers: 11)
American Mineralogist     Hybrid Journal   (Followers: 15)
Analyst     Full-text available via subscription   (Followers: 39)
Angewandte Chemie     Hybrid Journal   (Followers: 170)
Angewandte Chemie International Edition     Hybrid Journal   (Followers: 252)
Annales UMCS, Chemia     Open Access   (Followers: 1)
Annals of Clinical Chemistry and Laboratory Medicine     Open Access   (Followers: 5)
Annual Reports in Computational Chemistry     Full-text available via subscription   (Followers: 3)
Annual Reports Section A (Inorganic Chemistry)     Full-text available via subscription   (Followers: 4)
Annual Reports Section B (Organic Chemistry)     Full-text available via subscription   (Followers: 9)
Annual Review of Chemical and Biomolecular Engineering     Full-text available via subscription   (Followers: 12)
Annual Review of Food Science and Technology     Full-text available via subscription   (Followers: 13)
Anti-Infective Agents     Hybrid Journal   (Followers: 3)
Antiviral Chemistry and Chemotherapy     Open Access   (Followers: 2)
Applied Organometallic Chemistry     Hybrid Journal   (Followers: 9)
Applied Spectroscopy     Full-text available via subscription   (Followers: 24)
Applied Surface Science     Hybrid Journal   (Followers: 32)
Arabian Journal of Chemistry     Open Access   (Followers: 6)
ARKIVOC     Open Access   (Followers: 1)
Asian Journal of Biochemistry     Open Access   (Followers: 2)
Asian Journal of Chemistry and Pharmaceutical Sciences     Open Access  
Atomization and Sprays     Full-text available via subscription   (Followers: 4)
Australian Journal of Chemistry     Hybrid Journal   (Followers: 7)
Autophagy     Hybrid Journal   (Followers: 2)
Avances en Quimica     Open Access  
Biochemical Pharmacology     Hybrid Journal   (Followers: 10)
Biochemistry     Hybrid Journal   (Followers: 367)
Biochemistry Insights     Open Access   (Followers: 6)
Biochemistry Research International     Open Access   (Followers: 6)
BioChip Journal     Hybrid Journal  
Bioinorganic Chemistry and Applications     Open Access   (Followers: 10)
Bioinspired Materials     Open Access   (Followers: 5)
Biointerface Research in Applied Chemistry     Open Access   (Followers: 2)
Biointerphases     Open Access   (Followers: 1)
Biology, Medicine, & Natural Product Chemistry     Open Access   (Followers: 2)
Biomacromolecules     Hybrid Journal   (Followers: 22)
Biomass Conversion and Biorefinery     Partially Free   (Followers: 10)
Biomedical Chromatography     Hybrid Journal   (Followers: 7)
Biomolecular NMR Assignments     Hybrid Journal   (Followers: 3)
BioNanoScience     Partially Free   (Followers: 5)
Bioorganic & Medicinal Chemistry     Hybrid Journal   (Followers: 132)
Bioorganic & Medicinal Chemistry Letters     Hybrid Journal   (Followers: 87)
Bioorganic Chemistry     Hybrid Journal   (Followers: 10)
Biopolymers     Hybrid Journal   (Followers: 18)
Biosensors     Open Access   (Followers: 2)
Biotechnic and Histochemistry     Hybrid Journal   (Followers: 1)
Bitácora Digital     Open Access  
Boletin de la Sociedad Chilena de Quimica     Open Access  
Bulletin of the Chemical Society of Ethiopia     Open Access   (Followers: 1)
Bulletin of the Chemical Society of Japan     Full-text available via subscription   (Followers: 24)
Bulletin of the Korean Chemical Society     Hybrid Journal   (Followers: 1)
C - Journal of Carbon Research     Open Access   (Followers: 3)
Cakra Kimia (Indonesian E-Journal of Applied Chemistry)     Open Access  
Canadian Association of Radiologists Journal     Full-text available via subscription   (Followers: 2)
Canadian Journal of Chemistry     Hybrid Journal   (Followers: 10)
Canadian Mineralogist     Full-text available via subscription   (Followers: 6)
Carbohydrate Research     Hybrid Journal   (Followers: 26)
Carbon     Hybrid Journal   (Followers: 70)
Catalysis for Sustainable Energy     Open Access   (Followers: 8)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 7)
Catalysis Science and Technology     Free   (Followers: 8)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysts     Open Access   (Followers: 10)
Cellulose     Hybrid Journal   (Followers: 7)
Cereal Chemistry     Full-text available via subscription   (Followers: 4)
ChemBioEng Reviews     Full-text available via subscription   (Followers: 1)
ChemCatChem     Hybrid Journal   (Followers: 8)
Chemical and Engineering News     Free   (Followers: 22)
Chemical Bulletin of Kazakh National University     Open Access  
Chemical Communications     Full-text available via subscription   (Followers: 74)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 27)
Chemical Research in Chinese Universities     Hybrid Journal   (Followers: 3)
Chemical Research in Toxicology     Hybrid Journal   (Followers: 22)
Chemical Reviews     Hybrid Journal   (Followers: 196)
Chemical Science     Open Access   (Followers: 26)
Chemical Technology     Open Access   (Followers: 28)
Chemical Vapor Deposition     Hybrid Journal   (Followers: 5)
Chemie in Unserer Zeit     Hybrid Journal   (Followers: 57)
Chemie-Ingenieur-Technik (Cit)     Hybrid Journal   (Followers: 24)
ChemInform     Hybrid Journal   (Followers: 8)
Chemistry & Biodiversity     Hybrid Journal   (Followers: 7)
Chemistry & Biology     Full-text available via subscription   (Followers: 32)
Chemistry & Industry     Hybrid Journal   (Followers: 7)
Chemistry - A European Journal     Hybrid Journal   (Followers: 158)
Chemistry - An Asian Journal     Hybrid Journal   (Followers: 16)
Chemistry and Materials Research     Open Access   (Followers: 21)
Chemistry Central Journal     Open Access   (Followers: 4)
Chemistry Education Research and Practice     Free   (Followers: 5)
Chemistry in Education     Open Access   (Followers: 9)
Chemistry International     Open Access   (Followers: 3)
Chemistry Letters     Full-text available via subscription   (Followers: 44)
Chemistry of Materials     Hybrid Journal   (Followers: 263)
Chemistry of Natural Compounds     Hybrid Journal   (Followers: 9)
Chemistry World     Full-text available via subscription   (Followers: 20)
Chemistry-Didactics-Ecology-Metrology     Open Access   (Followers: 1)
ChemistryOpen     Open Access   (Followers: 1)
Chemkon - Chemie Konkret, Forum Fuer Unterricht Und Didaktik     Hybrid Journal  
Chemoecology     Hybrid Journal   (Followers: 4)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 15)
Chemosensors     Open Access  
ChemPhysChem     Hybrid Journal   (Followers: 12)
ChemPlusChem     Hybrid Journal   (Followers: 2)
ChemTexts     Hybrid Journal  
CHIMIA International Journal for Chemistry     Full-text available via subscription   (Followers: 2)
Chinese Journal of Chemistry     Hybrid Journal   (Followers: 6)
Chinese Journal of Polymer Science     Hybrid Journal   (Followers: 11)
Chromatographia     Hybrid Journal   (Followers: 24)
Chromatography     Open Access   (Followers: 2)
Chromatography Research International     Open Access   (Followers: 6)
Cogent Chemistry     Open Access   (Followers: 2)
Colloid and Interface Science Communications     Open Access  
Colloid and Polymer Science     Hybrid Journal   (Followers: 11)
Colloids and Interfaces     Open Access  
Colloids and Surfaces B: Biointerfaces     Hybrid Journal   (Followers: 6)
Combinatorial Chemistry & High Throughput Screening     Hybrid Journal   (Followers: 4)
Combustion Science and Technology     Hybrid Journal   (Followers: 22)
Comments on Inorganic Chemistry: A Journal of Critical Discussion of the Current Literature     Hybrid Journal   (Followers: 2)
Communications Chemistry     Open Access  
Composite Interfaces     Hybrid Journal   (Followers: 7)
Comprehensive Chemical Kinetics     Full-text available via subscription   (Followers: 1)
Comptes Rendus Chimie     Full-text available via subscription  
Comptes Rendus Physique     Full-text available via subscription   (Followers: 1)
Computational and Theoretical Chemistry     Hybrid Journal   (Followers: 9)
Computational Biology and Chemistry     Hybrid Journal   (Followers: 12)
Computational Chemistry     Open Access   (Followers: 2)
Computers & Chemical Engineering     Hybrid Journal   (Followers: 10)
Coordination Chemistry Reviews     Full-text available via subscription   (Followers: 4)
Copernican Letters     Open Access   (Followers: 1)
Corrosion Series     Full-text available via subscription   (Followers: 6)
Critical Reviews in Biochemistry and Molecular Biology     Hybrid Journal   (Followers: 6)
Croatica Chemica Acta     Open Access  
Crystal Structure Theory and Applications     Open Access   (Followers: 4)
CrystEngComm     Full-text available via subscription   (Followers: 13)
Current Catalysis     Hybrid Journal   (Followers: 2)
Current Chromatography     Hybrid Journal  
Current Green Chemistry     Hybrid Journal   (Followers: 1)
Current Metabolomics     Hybrid Journal   (Followers: 5)
Current Microwave Chemistry     Hybrid Journal  
Current Opinion in Colloid & Interface Science     Hybrid Journal   (Followers: 9)
Current Opinion in Molecular Therapeutics     Full-text available via subscription   (Followers: 14)
Current Research in Chemistry     Open Access   (Followers: 9)
Current Science     Open Access   (Followers: 71)
Current Trends in Biotechnology and Chemical Research     Open Access   (Followers: 3)
Dalton Transactions     Full-text available via subscription   (Followers: 23)
Detection     Open Access   (Followers: 3)
Developments in Geochemistry     Full-text available via subscription   (Followers: 2)
Diamond and Related Materials     Hybrid Journal   (Followers: 12)
Dislocations in Solids     Full-text available via subscription  

        1 2 3 4 | Last

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: 27  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 0949-1775 - ISSN (Online) 1432-0517
Published by Springer-Verlag Homepage  [2351 journals]
  • 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
      Pages: 257 - 267
      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: 2018-10-01
      DOI: 10.1007/s00769-018-1336-6
      Issue No: Vol. 23, No. 5 (2018)
       
  • 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)
       
  • Cooperation in publicly funded reference material production
    • Authors: Håkan Emteborg; Doris Florian; Steven Choquette; Stephen L. R. Ellison; Maria Fernandes-Whaley; Lindsey Mackay; Pearse McCarron; Ulrich Panne; Sylvia G. Sander; Sook-Kyung Kim; Andrea Held; Thomas Linsinger; Stefanie Trapmann
      PubDate: 2018-10-12
      DOI: 10.1007/s00769-018-1349-1
       
  • Provision of proficiency testing for histamine mass fraction in canned
           tuna to improve the capability of chemical laboratories in the Philippines
           
    • Authors: Benilda S. Ebarvia; Aaron Dacuya; Sharlene R. Cabanilla; Natividad R. Mamplata
      Abstract: In this work, two reference materials (RMs) for mass fraction of histamine in canned tuna were developed to address the need of local testing laboratories for matrix RMs and a PT scheme for histamine. A validated method using HPLC with fluorescence detector (340 nm for excitation and 445 nm for emission) was applied with post-column derivatization for the RM’s homogeneity and stability studies. Acceptable results were obtained after statistical evaluation of homogeneity and stability according to IUPAC Harmonized Protocol and ISO Guide 35, respectively. Two PT exercises for histamine determination based on ISO/IEC 17043 were organized in 2014 and 2015 with the assigned values of 148 and 65 mg/kg, respectively. These reference values were obtained using exact matching liquid chromatography–isotope dilution mass spectrometry (LC–IDMS) with gravimetric sample preparation. The corresponding uncertainty of the reference value was obtained by ISO GUM approach where the characterization of the sample gave the highest contribution (41 %). The satisfactory z-score performance evaluated from the 12 laboratories was 50 % and 58.3 % in the first and second PT round, respectively. Most of the laboratories used AOAC Official Method 977.13 but not all conducted method validation. The 50 % decrease in unsatisfactory results in the second PT round is a significant improvement in the local laboratory performance for histamine analysis. However, the provision of more PT schemes and the increased use of CRMs in the future are still needed by these laboratories for external quality assurance and method validation to enhance the present capability.
      PubDate: 2018-10-09
      DOI: 10.1007/s00769-018-1347-3
       
  • Innovative reference material for improving the quality control in the
           sucroenergetic sector
    • Authors: Maria I. V. Martínez; Rolf Zeisler; Elisabete A. De Nadai Fernandes; Márcio A. Bacchi
      Abstract: Analytical techniques in the sucroenergetic sector can now for the first time be supported by an innovative matrix-matching reference material produced from sugarcane leaves. This will further enhance the validity of the measurement results and contribute significantly to the quality assurance of plant nutrition analysis. The candidate reference material obtained had a low residual moisture and appropriate particle size. Neutron activation analysis was used to determine the mass fraction of Al, Br, Ca, Cl, Ce, Co, Cs, Cu, Fe, Hf, K, La, Mg, Mn, Mo, Na, P, Rb, Sb, Sc, Sm, Sr, Th, V and Zn, and the Kjeldahl method for N. Statistical techniques were applied to evaluate minimum sample mass and within-bottle homogeneity (ANOVA, Tukey test and PCA) and between-bottles homogeneity (ANOVA). It is demonstrated in this paper that the material is homogeneous using 50 mg mass sample for most chemical elements. However, sample masses of 200 mg or greater are required for Co, Na, Sb and V.
      PubDate: 2018-10-03
      DOI: 10.1007/s00769-018-1348-2
       
  • Toward the determination of estrogenic compounds in the framework of EU
           watch list: validation and implementation of a two-step solid phase
           extraction–liquid phase chromatography coupled to tandem mass
           spectrometry method
    • Authors: Sophie Lardy-Fontan; Véronique Le Diouron; Carine Fallot; Sophie Vaslin-Reimann; Béatrice Lalere
      Abstract: In this paper, development and optimization of a new method for determination of the three hormones (estrone, 17-β-estradiol and 17-α-ethinylestradiol) of the Watch list were described. The validated method relies on isotope dilution—two-step solid phase extraction–liquid phase chromatography mass spectrometry method. The measurement procedure validation has been performed in real matrices, including matrix with high suspended particulate matter and high organic carbon contents, to demonstrate its fitness for purpose. Method performances were in agreement with the requirements of the decision 2015/495/EU (maximal acceptable method detection limit and whole-water analysis). Limits of quantification of the method were of 0.4 ng L−1 for estrone and 17-β-estradiol and 0.1 ng L−1 for 17-α-ethinylestradiol. Expanded uncertainties (k = 2) at limit of quantification were equal to 35 % for estrone and 17-β-estradiol and 50 % for 17-α-ethinylestradiol. The method was successfully implemented to monitor French inland surface waters contamination. The survey reveals a chronic state of contamination by estrone (96 % quantification rate) and significant one by 17-β-estradiol and 17-α-ethinylestradiol (15 % quantification rate). Maximum measured concentrations are above predicted no-effect concentrations, indicating potential risk toward the environment.
      PubDate: 2018-09-26
      DOI: 10.1007/s00769-018-1346-4
       
  • Congresses, conferences, workshops and courses
    • PubDate: 2018-09-17
      DOI: 10.1007/s00769-018-1345-5
       
  • Results of an unannounced proficiency test for the quantification of
           hepatitis C virus (HCV) RNA in Shanghai, China
    • Authors: Xueliang Wang; Fen Liu; Lingli Jiang; Yun Bao; Yixiao Yang; Yanqun Xiao; Hualiang Wang
      Abstract: Sensitive and accurate hepatitis C virus (HCV) RNA quantification is essential for the management of chronic hepatitis C therapy. Currently, in Shanghai, China, many laboratories offer to quantify the HCV RNA level using various reverse transcription-polymerase chain reaction (rRT-PCR) assays, but the degree of proficiency may vary between them. The objective of this study was to realistically evaluate the performance of clinical laboratories for HCV RNA quantification by a new way of proficiency test program (unannounced inspection). Inactivated chimeric influenza viral particles (CIVP) encapsulating specific RNA sequences of HCV were prepared as positive samples. The sample panel, which consisted of two negative and eight positive samples with different concentrations of CIVP (25 IU/ml to 2.5×106 IU/ml), was distributed to 40 clinical laboratories for HCV RNA quantification. The results reported by the participating laboratories were compared and scored. It was found that 75 % (30/40) of the laboratories obtained an acceptable or better performance score, while the other 10 laboratories had room for improvement. Reported results for individual samples ranged from 125 IU/ml (minimum) to 6.0×104 IU/ml (maximum). The greatest variation was observed for samples with a relatively low concentration. Interlaboratory variability among replicate samples was significantly greater than intralaboratory variability (p < 0.05). Our results demonstrate that there is room for some laboratories to improve their performance in the quantification of HCV RNA in Shanghai. Additionally, this study underlines the importance of unannounced inspection for realistically monitoring the quality of diagnostic laboratories.
      PubDate: 2018-08-28
      DOI: 10.1007/s00769-018-1341-9
       
  • Preparation and characterization of in-house reference material for four
           organochlorine pesticides in tea matrix
    • Authors: Jie Feng; Jingguang Fan; Yansong Zhang; Haipeng Ma
      Abstract: Production and evaluation of in-house reference material for incurred residues of four organochlorine pesticides, named hexachlorobenzene, dicofol, pp′-DDE, and op′-DDT, in tea sample has been performed. Raw materials (tea samples) were confirmed to contain certain levels of incurred organochlorine pesticide residues by a validated gas chromatography–mass spectrometry method. After the materials had been milled and thoroughly mixed, 400 bottles each having 20 g sample were prepared and their homogeneity (within-bottle and bottle-to-bottle variation) was found to be sufficient. The materials demonstrated satisfying stability of four organochlorine pesticides in both short-term (30 days) and long-term (12 months) stability studies. The reference values were characterized using an accurate isotope dilution gas chromatography–mass spectrometry method. The mass fraction (± expanded uncertainty) of hexachlorobenzene, dicofol, pp′-DDE, and op′-DDT in the reference material was (2.1 ± 0.2) mg kg−1, (513.3 ± 31.3) mg kg−1, (8.3 ± 0.6) mg kg−1, and (14.9 ± 1.0) mg kg−1, respectively. The reference materials have been distributed for use in laboratory quality assurance.
      PubDate: 2018-08-25
      DOI: 10.1007/s00769-018-1328-6
       
  • Microbiology proficiency testing schemes in wine
    • Authors: Caterina Mazzoni; Abdelkader Boubetra; Sandrine Nguyen; Anne Tirard
      Abstract: The number of laboratories performing microbiological analyses of wines has gradually increased in recent years over the world. However, the lack of regular proficiency testing schemes (PTS) in this field is an obstacle for the monitoring of the laboratory performance. The complexity of wine matrix in terms of bacterial ecology and biochemical aspects is a factor to be taken into account in developing a PTS, especially during the preparation of stable and homogeneous samples. Since February 2016, BIPEA set up tests on Brettanomyces analyses in wine, gathering more than 20 laboratories around the world. For each test, the statistical treatment of the data is performed according to ISO 13528. The assigned and tolerance values are calculated from the participants’ data, and the performances of the laboratories are evaluated individually and collectively according to ISO/IEC 17043 and ISO/DIS 22117. The results obtained in these first tests are satisfactory with a progressive improvement of the dispersion of participants’ results over the series. These data confirm that participating in a PTS is particularly important for the laboratories in order to assess and improve analytical performances and to obtain recognition of their analytical procedures by the accreditation bodies according to ISO/IEC 17025.
      PubDate: 2018-08-25
      DOI: 10.1007/s00769-018-1342-8
       
  • Proficiency testing in analytical chemistry, microbiology and laboratory
           medicine: discussions on current practice and future directions
    • Authors: Brian Brookman; Owen Butler; Laura Ciaralli; Monika Horsky; Caroline Laurent; Tracey Noblett; Ulf Örnemark; Marina Patriarca; Lorens P. Sibbesen; Ulla Tiikkainen; Kees van Putten; Piotr Robouch
      Abstract: A summary of the working group discussions on proficiency testing (PT) and external quality assessment (EQA) held at the Eurachem Workshop, Portorož, Slovenia, 9–12 October 2017, is provided. The working groups covered a range of issues concerned with current practice and future directions; the importance of interpretative PT/EQA schemes; changes to PT/EQA schemes in developing countries over the last 10 years; implementing ISO/IEC 17043 for sampling PT/EQA schemes; traditional versus virtual PT/EQA items; experience of the implementation of EA-4/18; and use and treatment of measurement uncertainty in PT/EQA schemes. Delegates from fifty-two countries attended the workshop, and this diversity of different backgrounds was represented on each of the working groups to capture a range of views and experience from a number of different measurement sectors. Working group representatives included PT/EQA providers, participants in PT/EQA schemes, end users of PT/EQA results such as accreditation bodies and regulatory authorities, national measurement institutes, laboratory associations, suppliers, universities and independent consultants from countries around the world.
      PubDate: 2018-08-25
      DOI: 10.1007/s00769-018-1343-7
       
  • Ruggedness testing of an analytical method for pesticide residues in
           potato
    • Authors: Britt Maestroni; Alan R. Vazquez; Valeria Avossa; Peter Goos; Veronica Cesio; Horacio Heinzen; Joerg Riener; Andrew Cannavan
      Abstract: The best demonstration of the ruggedness of a method is monitoring its performance on an ongoing basis as part of the analytical quality control applied in the laboratory. However, an initial demonstration of the ruggedness is often performed as one aspect of the method validation, to give confidence that the method should perform well under normal variations in conditions in routine application. This initial ruggedness testing is typically performed using either multiple replicate analyses or application of design of experiments (DoEs) which minimizes the number of analyses, time and effort required to detect influences on the measurement results. Two DoEs were applied for ruggedness testing for a modified QuEChERS multiresidue method for the detection of pesticide residues in potato by GC–MS/MS. Seven experimental factors were studied using an eight-run Plackett–Burman design replicated three times and an augmented definitive screening design with 34 runs. The relative effectiveness of the two approaches is discussed, in terms of their statistical significance, their cost-effectiveness and the richness of information they provide on the effects of the parameters investigated and the actual robustness of the method being tested.
      PubDate: 2018-08-24
      DOI: 10.1007/s00769-018-1335-7
       
  • Acquisition of stability data for pesticides in water sample through
           proficiency tests
    • Authors: Eric Ziegler; Anne Tirard; Abdelkader Boubetra; Marie de Bort
      Abstract: In the framework of a proficiency test for multiresidue determination, three water samples, coming from the same batch, were sent to each of the 25 participants. They were asked to analyze the first one 2 days after the production (D + 2), the second one at D + 4 and the last one at D + 9. D + 2 was selected as the first date of analysis in order to allow all the participants to receive their samples. Prior to the analysis, the samples were stored at 4 °C. The samples were distributed in 1-l bottle from a batch spiked with more than 100 pesticides. The spiking concentrations ranged from 120 ng/l to 227 ng/l. Apart from the usual proficiency evaluation with assigned values and z-scores, comparisons between the results at the different dates of analysis were made. Most of the substances were found to be stable during the considered period in the conditions of the test, but some profiles of evolution were highlighted for some others.
      PubDate: 2018-08-16
      DOI: 10.1007/s00769-018-1339-3
       
  • 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
       
  • 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
       
  • 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
       
 
 
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