Subjects -> CHEMISTRY (Total: 928 journals)
    - ANALYTICAL CHEMISTRY (59 journals)
    - CHEMISTRY (661 journals)
    - CRYSTALLOGRAPHY (23 journals)
    - ELECTROCHEMISTRY (28 journals)
    - INORGANIC CHEMISTRY (45 journals)
    - ORGANIC CHEMISTRY (47 journals)
    - PHYSICAL CHEMISTRY (65 journals)

CHEMISTRY (661 journals)                  1 2 3 4 | Last

Showing 1 - 200 of 735 Journals sorted alphabetically
Accounts of Materials Research     Hybrid Journal   (Followers: 8)
Accreditation and Quality Assurance: Journal for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 32)
ACS Applied Polymer Materials     Hybrid Journal   (Followers: 15)
ACS Catalysis     Hybrid Journal   (Followers: 57)
ACS Chemical Neuroscience     Hybrid Journal   (Followers: 26)
ACS Combinatorial Science     Hybrid Journal   (Followers: 13)
ACS Environmental Au     Open Access   (Followers: 10)
ACS Macro Letters     Hybrid Journal   (Followers: 29)
ACS Materials Letters     Open Access   (Followers: 7)
ACS Medicinal Chemistry Letters     Hybrid Journal   (Followers: 45)
ACS Nano     Hybrid Journal   (Followers: 223)
ACS Photonics     Hybrid Journal   (Followers: 16)
ACS Symposium Series     Full-text available via subscription   (Followers: 5)
ACS Synthetic Biology     Hybrid Journal   (Followers: 38)
Acta Chemica Malaysia     Open Access   (Followers: 2)
Acta Chimica Slovaca     Open Access   (Followers: 4)
Acta Chimica Slovenica     Open Access   (Followers: 4)
Acta Chromatographica     Full-text available via subscription   (Followers: 9)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 10)
Acta Scientifica Naturalis     Open Access   (Followers: 4)
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 9)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 12)
Adsorption Science & Technology     Open Access   (Followers: 9)
Advanced Electronic Materials     Hybrid Journal   (Followers: 13)
Advanced Functional Materials     Hybrid Journal   (Followers: 76)
Advanced Journal of Chemistry, Section A     Open Access   (Followers: 4)
Advanced Journal of Chemistry, Section B     Open Access   (Followers: 1)
Advanced Science Focus     Free   (Followers: 8)
Advanced Theory and Simulations     Hybrid Journal   (Followers: 5)
Advanced Therapeutics     Hybrid Journal   (Followers: 1)
Advances in Chemical Engineering and Science     Open Access   (Followers: 131)
Advances in Chemical Science     Open Access   (Followers: 52)
Advances in Chemistry     Open Access   (Followers: 37)
Advances in Chemistry     Full-text available via subscription   (Followers: 9)
Advances in Colloid and Interface Science     Full-text available via subscription   (Followers: 15)
Advances in Environmental Chemistry     Open Access   (Followers: 13)
Advances in Enzyme Research     Open Access   (Followers: 10)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 8)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 34)
Advances in Nanoparticles     Open Access   (Followers: 17)
Advances in Organometallic Chemistry     Full-text available via subscription   (Followers: 18)
Advances in Polymer Science     Hybrid Journal   (Followers: 49)
Advances in Protein Chemistry and Structural Biology     Full-text available via subscription   (Followers: 18)
Advances in Quantum Chemistry     Full-text available via subscription   (Followers: 5)
Advances in Sample Preparation     Open Access   (Followers: 6)
Advances in Science and Technology     Full-text available via subscription   (Followers: 18)
Aerosol Science and Engineering     Hybrid Journal   (Followers: 2)
African Journal of Chemical Education     Open Access   (Followers: 6)
African Journal of Pure and Applied Chemistry     Open Access   (Followers: 6)
Aggregate     Open Access   (Followers: 1)
Agrokémia és Talajtan     Full-text available via subscription   (Followers: 2)
Al-Kimia : Jurnal Penelitian Sains Kimia     Open Access  
Alchemy : Journal of Chemistry     Open Access   (Followers: 2)
Alchemy : Jurnal Penelitian Kimia     Open Access  
Alfarama Journal of Basic & Applied Sciences     Open Access   (Followers: 8)
Alotrop     Open Access  
AMB Express     Open Access   (Followers: 1)
Ambix     Hybrid Journal   (Followers: 3)
American Journal of Biochemistry and Biotechnology     Open Access   (Followers: 45)
American Journal of Biochemistry and Molecular Biology     Open Access   (Followers: 21)
American Journal of Chemistry     Open Access   (Followers: 37)
American Journal of Plant Physiology     Open Access   (Followers: 9)
Analyst     Hybrid Journal   (Followers: 35)
Analytical Science Advances     Open Access   (Followers: 1)
Angewandte Chemie     Hybrid Journal   (Followers: 169)
Angewandte Chemie International Edition     Hybrid Journal   (Followers: 275)
Annales Universitatis Mariae Curie-Sklodowska, sectio AA – Chemia     Open Access   (Followers: 1)
Annals of Clinical Chemistry and Laboratory Medicine     Open Access   (Followers: 6)
Annual Reports in Computational Chemistry     Full-text available via subscription   (Followers: 4)
Annual Reports Section A (Inorganic Chemistry)     Full-text available via subscription   (Followers: 5)
Annual Review of Chemical and Biomolecular Engineering     Full-text available via subscription   (Followers: 14)
Annual Review of Food Science and Technology     Full-text available via subscription   (Followers: 13)
Antiviral Chemistry and Chemotherapy     Open Access   (Followers: 1)
Applied Organometallic Chemistry     Hybrid Journal   (Followers: 7)
Applied Spectroscopy     Full-text available via subscription   (Followers: 20)
Applied Surface Science     Hybrid Journal   (Followers: 31)
Arabian Journal of Chemistry     Open Access   (Followers: 4)
ARKIVOC     Open Access   (Followers: 1)
Asian Journal of Applied Chemistry Research     Open Access   (Followers: 1)
Asian Journal of Biochemistry     Open Access   (Followers: 2)
Asian Journal of Chemical Sciences     Open Access   (Followers: 1)
Asian Journal of Chemistry and Pharmaceutical Sciences     Open Access  
Asian Journal of Physical and Chemical Sciences     Open Access   (Followers: 2)
Australian Journal of Chemistry     Hybrid Journal   (Followers: 8)
Autophagy     Hybrid Journal   (Followers: 8)
Biochemical Pharmacology     Hybrid Journal   (Followers: 10)
Biochemistry     Hybrid Journal   (Followers: 248)
Biochemistry Insights     Open Access   (Followers: 6)
Biochemistry Research International     Open Access   (Followers: 5)
BioChip Journal     Hybrid Journal  
Bioinorganic Chemistry and Applications     Open Access   (Followers: 5)
Biointerface Research in Applied Chemistry     Open Access  
Biointerphases     Open Access   (Followers: 1)
Biology, Medicine, & Natural Product Chemistry     Open Access   (Followers: 2)
Biomacromolecules     Hybrid Journal   (Followers: 24)
Biomass Conversion and Biorefinery     Partially Free   (Followers: 10)
Biomedical Chromatography     Hybrid Journal   (Followers: 6)
Biomolecular NMR Assignments     Hybrid Journal   (Followers: 3)
BioNanoScience     Partially Free   (Followers: 3)
Bioorganic & Medicinal Chemistry     Hybrid Journal   (Followers: 85)
Bioorganic & Medicinal Chemistry Letters     Hybrid Journal   (Followers: 61)
Bioorganic Chemistry     Hybrid Journal   (Followers: 7)
Biopolymers     Hybrid Journal   (Followers: 15)
Biosensors     Open Access   (Followers: 3)
Biotechnic and Histochemistry     Hybrid Journal   (Followers: 3)
Bitácora Digital     Open Access  
Boletin de la Sociedad Chilena de Quimica     Open Access  
Bulletin of Institute of Chemistry and Chemical Technology, Mongolian Academy of Sciences     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: 25)
Bulletin of the Korean Chemical Society     Hybrid Journal   (Followers: 1)
C - Journal of Carbon Research     Open Access   (Followers: 5)
Cakra Kimia (Indonesian E-Journal of Applied Chemistry)     Open Access  
Canadian Association of Radiologists Journal     Full-text available via subscription   (Followers: 1)
Canadian Journal of Chemistry     Hybrid Journal   (Followers: 11)
Canadian Mineralogist     Full-text available via subscription   (Followers: 5)
Carbohydrate Polymer Technologies and Applications     Open Access  
Carbohydrate Polymers     Hybrid Journal   (Followers: 11)
Carbohydrate Research     Hybrid Journal   (Followers: 23)
Carbon     Hybrid Journal   (Followers: 64)
Carbon Capture Science & Technology     Open Access   (Followers: 1)
Carbon Trends     Open Access   (Followers: 7)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 9)
Catalysis Science and Technology     Hybrid Journal   (Followers: 10)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 4)
Catalysts     Open Access   (Followers: 12)
Cell Reports Physical Science     Open Access   (Followers: 1)
Cellulose     Hybrid Journal   (Followers: 8)
Cereal Chemistry     Full-text available via subscription   (Followers: 4)
Chem     Hybrid Journal   (Followers: 7)
Chem Catalysis     Hybrid Journal   (Followers: 1)
ChemBioEng Reviews     Full-text available via subscription   (Followers: 3)
ChemCatChem     Hybrid Journal   (Followers: 8)
Chemical and Engineering News     Free   (Followers: 22)
Chemical Bulletin of Kazakh National University     Open Access  
Chemical Communications     Hybrid Journal   (Followers: 83)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 27)
Chemical Physics Impact     Full-text available via subscription   (Followers: 1)
Chemical Research in Chinese Universities     Hybrid Journal   (Followers: 4)
Chemical Research in Toxicology     Hybrid Journal   (Followers: 22)
Chemical Reviews     Hybrid Journal   (Followers: 212)
Chemical Science     Open Access   (Followers: 43)
Chemical Science International Journal     Open Access  
Chemical Technology     Open Access   (Followers: 75)
Chemical Thermodynamics and Thermal Analysis     Open Access   (Followers: 4)
Chemical Vapor Deposition     Hybrid Journal   (Followers: 4)
Chemie in Unserer Zeit     Hybrid Journal   (Followers: 39)
Chemie-Ingenieur-Technik (Cit)     Hybrid Journal   (Followers: 18)
ChemInform     Hybrid Journal   (Followers: 5)
Chemistry     Open Access  
Chemistry & Biodiversity     Hybrid Journal   (Followers: 7)
Chemistry & Industry     Full-text available via subscription   (Followers: 6)
Chemistry - A European Journal     Hybrid Journal   (Followers: 143)
Chemistry - An Asian Journal     Hybrid Journal   (Followers: 20)
Chemistry Africa : A Journal of the Tunisian Chemical Society     Hybrid Journal  
Chemistry and Materials Research     Open Access   (Followers: 19)
Chemistry Central Journal     Open Access   (Followers: 4)
Chemistry Education Research and Practice     Free   (Followers: 7)
Chemistry Education Review     Open Access   (Followers: 2)
Chemistry in Education     Open Access   (Followers: 5)
Chemistry Letters     Full-text available via subscription   (Followers: 43)
Chemistry of Heterocyclic Compounds     Hybrid Journal   (Followers: 5)
Chemistry of Materials     Hybrid Journal   (Followers: 186)
Chemistry of Natural Compounds     Hybrid Journal   (Followers: 10)
Chemistry World     Hybrid Journal   (Followers: 20)
Chemistry-Didactics-Ecology-Metrology     Open Access  
ChemistryOpen     Open Access   (Followers: 1)
ChemistrySelect     Hybrid Journal  
Chemistry–Methods     Open Access   (Followers: 3)
Chemkon - Chemie Konkret, Forum Fuer Unterricht Und Didaktik     Hybrid Journal  
ChemNanoMat     Hybrid Journal   (Followers: 1)
Chemoecology     Hybrid Journal   (Followers: 2)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 13)
Chemosensors     Open Access   (Followers: 1)
ChemPhotoChem     Hybrid Journal  
ChemPhysChem     Hybrid Journal   (Followers: 12)
ChemPhysMater     Full-text available via subscription  
ChemPlusChem     Hybrid Journal   (Followers: 2)
Chempublish Journal     Open Access  
ChemSystemsChem     Hybrid Journal   (Followers: 1)
ChemTexts     Hybrid Journal   (Followers: 1)
CHIMIA International Journal for Chemistry     Open Access   (Followers: 2)
Chinese Journal of Chemistry     Hybrid Journal   (Followers: 6)
Chinese Journal of Polymer Science     Hybrid Journal   (Followers: 9)
Chromatographia     Hybrid Journal   (Followers: 21)
Chromatography     Open Access   (Followers: 3)
Chromatography Research International     Open Access   (Followers: 4)
Ciencia     Open Access  
Clay Minerals     Hybrid Journal   (Followers: 9)
Cogent Chemistry     Open Access   (Followers: 3)
Colloid and Interface Science Communications     Open Access  
Colloid and Polymer Science     Hybrid Journal   (Followers: 6)
Colloids and Interfaces     Open Access  
Colloids and Surfaces B: Biointerfaces     Hybrid Journal   (Followers: 8)
Combinatorial Chemistry & High Throughput Screening     Hybrid Journal   (Followers: 2)
Combustion Science and Technology     Hybrid Journal   (Followers: 26)
Comments on Inorganic Chemistry: A Journal of Critical Discussion of the Current Literature     Hybrid Journal   (Followers: 1)
Communications Chemistry     Open Access   (Followers: 2)
Communications Materials     Open Access  
Composite Interfaces     Hybrid Journal   (Followers: 6)

        1 2 3 4 | Last

Similar Journals
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: 32  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 0949-1775 - ISSN (Online) 1432-0517
Published by Springer-Verlag Homepage  [2468 journals]
  • Identifying risk management challenges in laboratories

    • Free pre-print version: Loading...

      Abstract: Over the years, risk management gains significant importance in laboratories of every kind. The safety of workers, the accuracy and reliability of laboratory results, issues of financial sustainability as well as the protection of the environment play an important role in decision-making in both industry and services. In order a laboratory to be considered as reliable, safe, and therefore competitive, it is recommended to comply with the requirements of international standards and other regulatory documents as well as to use tools and risk management procedures. In this paper, information is summarized concerning the terms “risk” and “risk management” which are then approached through the latest ISO 9001, ISO/IEC 17025, and ISO 14001 standards. The process of risk management based on the ISO 31000 standard is described, the options for treatment and the techniques that can be applied in the risk management process based on the latest ISO 31010 standard are grouped and indicated. Additionally, information from the literature is referred to the reasons that led the laboratories to integrate in their quality system risk management techniques, the most common mistakes that occur in the various phases of laboratory tests, their causes, their consequences as well as the proposed treatments. The aim of this work is to highlight significant challenges concerning the need to implement management procedures in the daily routine, to warn, raise awareness and inform about existing ways of risk management that can be implemented, methodologically and technically, to laboratories, under internationally recognized and updated standards.
      PubDate: 2023-05-12
       
  • The conception and initial years of a quality management system based on
           ISO/IEC 17025: an action research

    • Free pre-print version: Loading...

      Abstract: This work presents research focused on obtaining and maintaining the ISO/IEC 17025 recognition in a Brazilian environmental analysis laboratory that acts as an environmental consultancy, providing services for the biological treatment of effluents. Three research cycles were conducted, covering the recognition preparation, surveillance period, and first reassessment preparation. The importance of considering both the technical and managerial aspects of this process is highlighted. In addition, it is fundamental to involve all employees in the process and reinforce the value of audits as an instrument for evaluating and improving the entire system. Despite the importance of the consultancy contracted to assist in the design of the management system, only with its effective use was it possible to improve the laboratory’s needs. Thus, the contribution of all collaborators to this process is fundamental. Despite the importance of “metrological networks” for encouraging a quality culture and accreditation in Brazil, greater rigor may be needed regarding the demand for systematic evidence of sustainable compliance and maturity of the management system. The recognition and accreditation challenges are the first, as the need to review and improve the Quality Management System is recurrent, whether due to the greater maturity of the laboratory or the identification of new opportunities.
      PubDate: 2023-05-11
       
  • From VIM3 toward the next edition of the International Vocabulary of
           Metrology

    • Free pre-print version: Loading...

      Abstract: The International Vocabulary of Metrology (VIM) is presently at its third Edition (2012) (VIM3). VIM3 was a major achievement done with an important contribution of Paul De Bièvre. Numerous comments can be found in the literature concerning the evaluation of VIM3 that will be taken here as a reference for the future developments. The present paper is based mainly on the concept that such a vocabulary is assumed to be of great help for the practitioners of metrology, i.e., in general of people that must correctly apply the idiom of metrology according to the current meaning of its terms. The core of VIM3, i.e., its few basic terms, which are those currently used in metrology (defined according to paper’s Glossary), is identified, and their current meaning recalled together with the rationale for their choice. The above illustration is compared with recently proposed changes of several of them, and with some terms newly proposed.
      PubDate: 2023-04-19
       
  • Design and implementation of electronic reference material document system

    • Free pre-print version: Loading...

      Abstract: Reference material (RM) documents are indispensable for proper use of reference materials, playing an important role in guiding users to store and use reference materials correctly. However, limitations have been found in paper documents of reference materials, such as waiting long for their preparation, high risk of loss, and lack of security measures. This paper describes the design and implementation of an information system for electronic reference material documents. Based on the varieties and batches of reference materials, the coding rules for two-dimensional codes of reference materials are formulated and employed to uniquely manage each unit of reference materials. A complete process of document template making, review and release has been designed as part of the manufacturing process for reference materials. Using the interface development function of major social media platforms, the method of generating and previewing documents by scanning the QR code on the label of a reference material with a mobile phone is designed. Users may view and download all electronic documents generated by their scanning through the special document management website page. The system has been implemented and is currently in use. Compared with paper documents, electronic documents have obvious advantages in uniqueness, security and convenience.
      PubDate: 2023-04-17
       
  • Evaluation of the 1R6F certified reference cigarette for proficiency
           testing of mainstream smoke parameters

    • Free pre-print version: Loading...

      Abstract: A goal of the cooperative agreement between the U.S. Food and Drug Administration and the Center for Tobacco Reference Products (CTRP) at the University of Kentucky was to produce a standard reference cigarette for researchers to further tobacco science. The 1R6F certified reference cigarette for analytical testing was developed to be typical of an American blend cigarette. The cigarettes have been used in proficiency testing (PT) schemes under the supervision of the CTRP since 2016 for a variety of parameters. Data were compared from 8 rounds of PT schemes submitted by participating laboratories, which include various international stakeholders comprised of academic institutions, federal research/regulatory laboratories, tobacco product manufacturers, and independent contract testing laboratories. Evaluation of the datasets for harmful and potentially harmful constituents (HPHCs) within the mainstream smoke of the 1R6F certified reference cigarette included tobacco-specific nitrosamines (TSNA), tar, nicotine, and carbon monoxide (TNCO), and Benzo[α]pyrene (BαP). Of the datasets evaluated, less than 5 % resulted in either a warning or alert, and less than 2 % resulted in an alert. Comparisons across multiple PT rounds revealed no significant differences in the consensus means of the tested parameters. Evaluation of data submitted by participating laboratories for multiple proficiency test rounds shows that the 1R6F certified reference cigarette is an acceptable material as a control reference for the analysis of HPHCs which is imperative since some stakeholders may be required to participate in, and receive satisfactory results, from PT for accreditation purposes.
      PubDate: 2023-03-13
      DOI: 10.1007/s00769-023-01534-1
       
  • Correction to: Improving performance evaluation via the provision of
           proficiency testing programmes in Asia–Pacific with metrologically
           traceable reference values for inorganic elements

    • Free pre-print version: Loading...

      PubDate: 2023-03-07
      DOI: 10.1007/s00769-023-01536-z
       
  • Paul De Bievre down under: practical metrology in chemistry and its
           principles

    • Free pre-print version: Loading...

      Abstract: Paul De Bievre interacted with the Australian national measurement system in the 1990s as it developed its chemical measurement system infrastructure. It was a fruitful and stimulating time when practical measurement—weights and measures in its modern forms—mixed with the ideas of metrology in chemistry. Among the issues discussed were accreditation, a new journal called accreditation and quality assurance (this journal, ACQUAL), clear and accurate communication in measurement, primary methods of measurement and basic principles of metrology in chemistry. I end commenting on the applicability of the practical metrology in chemistry perspective to the development of an international trading system in carbon and its credits: the weights and measures problem of the twenty-first century.
      PubDate: 2023-03-04
      DOI: 10.1007/s00769-023-01535-0
       
  • On the optimal use of silver–silver chloride reference electrodes

    • Free pre-print version: Loading...

      Abstract: The role of silver–silver chloride electrode for providing the reference potential is quite important for the precise potentiometric measurements. Our study focuses to find the conditions for its optimal use, especially, in perspective for a long-term viability of electrode. In particular, we reassessed the temporal stability of the standard potential and presented the results of its measurement for a time span of ten years.
      PubDate: 2023-02-07
      DOI: 10.1007/s00769-023-01533-2
       
  • Laboratory glassware cleaning validation in pharmaceutical industry: a
           case study

    • Free pre-print version: Loading...

      Abstract: Glassware cleaning is an essential part of pharmaceutical industry’s quality process, although, to date, no precise methodology is recommended by the pharmaceutical regulations. This study focuses on developing a detailed validation procedure for laboratory glassware cleaning and applying it routinely in quality control labs. The first step was the determination of the worst-case among raw materials controlled on a pharmaceutical site by using the failure mode effects analysis (FMEA) approach based on water solubility (WS), flask volume (FV), concentration (C), detectability (D) according to the absorptivity, and the probability (P) of the occurrence of the risk based on raw material analysis frequency. The adopted manual cleaning method was validated on three series of six flasks. Absorbances at λmax of cleaned and worst-case flasks were compared to the limit of detection (LOD). Methylparaben was found to be the worst-case. Cleaning validation was carried out on 50 mL flasks containing aqueous solutions at 0.11 g/L after a contact time of 20 min under stirring. A prewash with tap water, a proper wash with a 95-V/5-V water/detergent solution (quaternary ammonium), and a final wash with purified water were carried out. The absorbances of all the cleaned flasks were lower than those of the worst-case LOD (< 0.0112). The selected cleaning procedure has been successfully validated. The proposed approach precisely describes the steps to be followed and can be adapted by other pharmaceutical industries as part of their laboratory glassware cleaning validation methodology.
      PubDate: 2023-02-06
      DOI: 10.1007/s00769-023-01531-4
       
  • Improving performance evaluation via the provision of proficiency testing
           programmes in Asia–Pacific with metrologically traceable reference
           values for inorganic elements

    • Free pre-print version: Loading...

      Abstract: This paper reviews some proficiency testing (PT) programmes operated under the auspices of Asia Pacific Metrology Programme and Asia Pacific Laboratory Accreditation Cooperation Joint Proficiency Testing Working Group. The assigned values of these joint PTs are traceable to the SI. Provision of PTs based on reference values (PTRVs) with metrological traceability enables meaningful performance evaluation and assessment of metrological comparability of the participants’ results. Special focus will be given to those joint PTs related to analysis of inorganic elements in various sample matrices organized or co-organized by Government Laboratory of Hong Kong, China. Comparison based on different evaluation criteria (i.e. consensus value vs reference value) is carried out. Comprehensive evaluation and review of some performance indicators revealed several crucial findings such as the performance of different analytical conditions, recent analytical trends and areas of improvements. The organization of a series of these joint PTs could be regarded as a strong support of the concept that PTRV with metrological traceable reference values is an effective way to promote the concept of metrological traceability to the field laboratories and provide a meaningful performance evaluation tool for assessment of PT performance.
      PubDate: 2023-01-27
      DOI: 10.1007/s00769-022-01528-5
       
  • Development of certified reference materials of ethanol in aqueous
           solution resulting from the participation of GUM in EMPIR 16RPT02 ALCOREF
           project

    • Free pre-print version: Loading...

      Abstract: The measurement of alcohol concentration in exhaled air is used worldwide for sobriety checks by police and other services. Breath alcohol analyzers are instruments for the determination of alcohol (ethanol) mass concentration in exhaled air. These instruments are evaluated and calibrated in many countries (among others in Poland) using wet gas standards produced in situ from aqueous standard solutions in breath simulators. The value of the mass fraction of ethanol in the solution is necessary to determine the concentration of ethanol in the produced gas standard. New reference materials of ethanol in an aqueous solution intended for use in breath simulators for calibration and testing of breath alcohol analyzers were developed as a result of the Central Office of Measures (GUM) participation in the EMPIR 16RPT02 ALCOREF project. CRMs were certified following standard ISO 17034:2016 and ISO Guide 35:2017 ensuring traceability of certified values to SI units and covering ethanol content ranging from 0.129 g/kg to 5.051 g/kg required by OIML R126. The certified mass fractions of the ethanol and expanded uncertainties (k = 2) of the four reference materials representative for the entire range were (0.2588 ± 0.00040) g/kg (GUM 12.2), (0.6470 ± 0.00074) g/kg (GUM 12.3), (1.0352 ± 0.0014) g/kg (GUM 12.4) and (5.0506 ± 0.0092) g/kg (GUM 12.8). The CRMs produced by the procedure presented in this paper have been found to be fit for purpose.
      PubDate: 2023-01-27
      DOI: 10.1007/s00769-022-01529-4
       
  • Application of stochastic Bayesian modeling to assess quality and safety
           profile of tea in China market

    • Free pre-print version: Loading...

      Abstract: Limited information was available on the quality and safety profile of tea in China, even though food quality and safety of tea is an issue of great concern to consumers and the public. Stochastic Bayesian modeling was employed in this study to investigate food quality and safety profile of tea in China market. Results indicated that the overall nonconforming rate (95 % CI, confidence interval) of tea was 2.6 ‰ (1.3 ‰ to 4.5 ‰), indicating a high level for the quality and safety status of tea in market. Pesticide residues exceeding maximal limit (MRLs) was the major cause leading to nonconformity of tea, with estimated incidences (95 % CI) of 11.7 ‰ (0.5 ‰ to 53.2 ‰), 1.1 ‰ (0.4 ‰ to 2.0 ‰), 2.3 ‰ (0.6 ‰ to 5.5 ‰), and 0.55 ‰ (0.06 ‰ to 1.51 ‰), respectively, for Yellow tea, Green tea, and Oolong tea; whereas illegal application of additives was more likely to occur in black tea, with an incidence of 1.1 ‰ (0.4 ‰ to 2.7 ‰), despite that an estimated incidence of 2.9 ‰ (0.4 ‰ to 16.1 ‰) was generated for Yellow tea due to fewer inspects and small sample sizes involved for analysis. The difference in quality and safety status of tea between provinces was statistically insignificant, as indicated by overlapped 95 % CIs of nonconforming rates. Results of this study provided reliable information on quality and safety profile of tea in China market, and suggested that application of pesticides during tea plantation and illegal use of additives during black tea production worth more attention in respect of quality and safety of tea.
      PubDate: 2023-01-25
      DOI: 10.1007/s00769-023-01532-3
       
  • Establishment of Cryptococcus neoformans and C. gattii as certified
           reference materials according to the requirements of ISO 17034:2016

    • Free pre-print version: Loading...

      Abstract: The use of certified reference materials (CRMs) is essential for laboratories that want to achieve reliable results because these materials have well-defined property values that enable the traceability of certain parameters in several areas. The production of CRMs for microbiological tests is complex, as there is a natural instability of microorganisms. The objective of this study was to establish Cryptococcus neoformans and Cryptococcus gattii as CRM, according to the requirements of ISO 17034. The availability of these materials will assist in the cryptococcosis diagnosis and support the academic community, since cryptococcosis is among the most lethal mycoses and affects more than one million people worldwide each year. C. neoformans CFRVS CRM 40,323 and C. gattii CFRVS CRM 40,324 batches, in skim milk at 20 %, were homogeneous and stable for 1 year. The materials were also stable at 4 °C, 25 °C and 35 °C, temperatures that simulate transportation conditions, for 7 days. In addition to the quantitative characterization, qualitative characterization of materials was conducted by observing melanin production, l-Canavanine Glycine Bromothymol Blue (CGB) Agar test and by RFLP-URA5 analyses. Certified property values and their associated uncertainties were assigned for each CRM. For C. neoformans CFRVS CRM 40,323, expanded uncertainty (UCRM) was 13 CFU mL−1 for 33 CFU mL−1 property value. For C. gattii CFRVS CRM 40,324, UCRM was 9.2 CFU mL−1 for 15 CFU mL−1 property value. Our study contributes to the development of CRM production in the microbiological field, whose supply is still very limited worldwide.
      PubDate: 2023-01-24
      DOI: 10.1007/s00769-023-01530-5
       
  • Indonesian proficiency testing for electrolytic conductivity measurement
           of synthetic wastewater: a comparison of performance evaluation based on
           four standardized performance statistics

    • Free pre-print version: Loading...

      Abstract: Electrolytic conductivity is recognized as one of the parameters to determine water quality. An accurate measurement of electrolytic conductivity of wastewater before dumping it into the environment is crucial to prevent water pollution. Therefore, the ability of laboratories in conducting accurate and comparable measurements of electrolytic conductivity is important to guarantee the measurement results. The measurement quality of the laboratories can be determined by participating in a proficiency testing (PT) conducted by accredited PT provider. In 2018, Chemical Metrology Laboratory, Indonesian Institute of Sciences (LIPI), as a PT provider, conducted a PT for electrolytic conductivity measurement with synthetic wastewater as the PT test item. It was prepared from cations and anions commonly found in natural wastewater. A total of 25 participants from Indonesian testing laboratories reported their electrolytic conductivity measurements. These results were then evaluated using a standardized performance statistic of z score, z′ score, En score and ζ (zeta) score. There were 20 laboratories having satisfactory results evaluated using both z score and z′ score, while only 14 laboratories were considered having a successful performance evaluated using En score and ζ score. The evaluation results show that the participants already have the ability to measure the electrolytic conductivity value but some of them still need improvement in estimating the uncertainty.
      PubDate: 2023-01-18
      DOI: 10.1007/s00769-022-01526-7
       
  • Some pitfalls in the uncertainty evaluation of isotope delta reference
           materials

    • Free pre-print version: Loading...

      Abstract: The Guide to the Expression of Uncertainty in Measurement (GUM) provides a framework for evaluating analytical data and characterizing their dispersion in a consistent manner. This is of eminent importance in the case of reference materials and their recommended values that are used for calibration of further measurements. The proper propagation of uncertainties for those data is essential. Guidance is provided in the GUM on how to calculate the combined standard uncertainty for a mean value or central value based on multiple individual measurements including their calibration uncertainty. However, according to published data, the guidance provided by GUM is not always properly applied in practice. Several published studies show calculated uncertainties much lower than those of input quantities. This may be caused by improper handling of the propagation of uncertainty components, thereby breaking the traceability chain for reported values. A simple check method using conventional statistical means is proposed to detect and to avoid such mistakes related to calibration uncertainties. It is intended to help to ensure a proper uncertainty propagation, to maintain a system of reliable and traceable reference materials. A spreadsheet is provided for the implementation of such a check. Example calculations for published data are presented.
      PubDate: 2023-01-11
      DOI: 10.1007/s00769-022-01527-6
       
  • On testing of the homogeneity of variances for two-side power distribution
           family

    • Free pre-print version: Loading...

      Abstract: Some widely used classical tests for homogeneity of variance (Fisher, Link, Cochran, and Bliss–Cochran–Tukey) are considered for the case when the random variable has a symmetric two-side power distribution. The corresponding critical values for the test statistics are obtained. Some comparative analysis of power of the tests is carried out. The case when the null hypothesis assumes a minor random scatter of the variance is considered separately.
      PubDate: 2022-12-13
      DOI: 10.1007/s00769-022-01525-8
       
  • Correction to: Evaluation of reproducibility uncertainty in micropipette
           calibrations for non‑nominal volumes through an interlaboratory study

    • Free pre-print version: Loading...

      PubDate: 2022-12-01
      DOI: 10.1007/s00769-022-01524-9
       
  • Complying with the resource requirements of ISO/IEC 17025:2017 in
           Indonesian calibration and testing laboratories: current challenges and
           future directions

    • Free pre-print version: Loading...

      Abstract: Compliance with all the requirements in the ISO/IEC 17025:2017 is crucial for testing and calibration laboratories in assuring the quality of measurement conducted in their laboratories. The latest version of the ISO/IEC 17025:2017 presents a different structure compared to the previous version, ISO/IEC 17025:2005. Therefore, amendments in the quality documents and the operational procedures in the laboratories are urgently required. However, not all laboratories’ personnel understand this new standard and know how to implement or incorporate this new version standard with their old version documents and operational procedures. It causes a problem for the testing and calibration laboratories, especially in Indonesia. This study is expected to provide enlightenment and hints for the laboratories struggling to comply with the ISO/IEC 17025:2017.
      PubDate: 2022-10-19
      DOI: 10.1007/s00769-022-01523-w
       
  • Development of a certified reference material for benzo[a]pyrene and
           benz[a]anthracene in olive oil

    • Free pre-print version: Loading...

      Abstract: This paper describes the development of an olive oil certified reference material containing benzo[a]pyrene and benz[a]anthracene. A method combining solid phase extraction and gas chromatography-isotope dilution mass spectrometry was used for the assignment of certified values and long-term stability study. The method was demonstrated to be suitable for the value assignment of both polycyclic aromatic hydrocarbons (PAHs) as our result was in good agreement with those from other metrology institutes in an international comparison (CCQM-K146) on determination of benzo[a]pyrene in olive oil. A metrological approach was taken to consider potential biases when certifying the mass fraction values of these two PAHs. The certified values with their associated uncertainties at approximately 95 % confidence level obtained for benzo[a]pyrene and benz[a]anthracene in olive oil were 9.85 µg/kg ± 0.75 µg/kg and 8.05 µg/kg ± 0.48 µg/kg, respectively. The measurement uncertainty was obtained by combining the uncertainty contributions from characterisation, homogeneity and stability of the material. Since the mass fraction levels of PAHs in the CRM are about five times higher than the regulatory limits or quantification limits, the practical use of the CRM is as a positive control for PAH monitoring in edible oil samples.
      PubDate: 2022-09-30
      DOI: 10.1007/s00769-022-01517-8
       
  • Risk management approach for testing and calibration laboratories

    • Free pre-print version: Loading...

      Abstract: In the latest revision of the ISO/IEC 17025 standard, General requirements for the competence of testing and calibration laboratories, published in 2017, the concept of risk-based thinking was introduced in its requirements. Although the new version introduces the concept, procedures to be adopted for the implementation of risk management in testing and calibration laboratories are not addressed. The article is conceptual in nature and summarizes information from the literature to assess the application of reputable risk management models and implement them in laboratories. Furthermore, it includes discussions on the implementation of risk management in the daily laboratory operations in a practical and effective way as per the requirements of ISO/IEC 17025.
      PubDate: 2022-09-12
      DOI: 10.1007/s00769-022-01521-y
       
 
JournalTOCs
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
Email: journaltocs@hw.ac.uk
Tel: +00 44 (0)131 4513762
 


Your IP address: 35.172.111.47
 
Home (Search)
API
About JournalTOCs
News (blog, publications)
JournalTOCs on Twitter   JournalTOCs on Facebook

JournalTOCs © 2009-