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  • 1
    Electronic Resource
    Electronic Resource
    Relationship between performance characteristics obtained from an interlaboratory study programme and combined measurement uncertainty: a case study (1998)
    Springer
    Accreditation and quality assurance 3 (1998), S. 462-467 
    Details
    ISSN: 1432-0517
    Keywords: Key words Interlaboratory study ; Traceability ; Comparability ; Reference material
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract  In the interlaboratory study programme "ILS Coal Characterisation", eight interlaboratory studies were organised based on the ISO standards for coal analysis. The use of blind samples in each round allows comparability of measurement results between rounds to be assessed. Based on the results, it could be demonstrated that the vast majority of the measurement results of the laboratories were traceable to results obtained in previous rounds of this programme. The hypothesis has been formulated that the combined standard uncertainty obtained from an interlaboratory study is equal to the reproducibility standard deviation. Whether the reproducibility can be used as the basis for the certification depends on whether the interlaboratory study includes all effects to be taken into account for establishing an uncertainty statement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s007690050286
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A framework for the application and materials in analytical chemistry (1996)
    Springer
    Accreditation and quality assurance 1 (1996), S. 207-212 
    Details
    ISSN: 1432-0517
    Keywords: Key words Reference materials ; Validation ; Calibration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract  Working group 5 of EuraChem Nederland has developed a framework for the implementation of reference materials in analytical chemistry. In this discussed paper, the framework is proposed as a tool for the development of standard operation procedures (SOPs) in laboratories. The implementation of (certified) reference materials in these SOPs is of major importance in establishing comparability and traceability in measurement results, which in turn play a crucial role in measurement in support of trade, environmental issues, and characterisation of materials. Recent developments in the field of uncertainty analysis require the application of reference materials. It is recognised that the calculation of the combined measurement uncertainty becomes almost impossible without the use of certified reference materials with a stated uncertainty.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s007690050069
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Comparability and traceability of coal ash analyses in an interlaboratory study program (1998)
    Springer
    Fresenius' journal of analytical chemistry 362 (1998), S. 503-507 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract From results obtained in an interlaboratory study program, performance characteristics for the determination of major and minor elements in coal ash have been established. For several parameters, a functional relationship between the content (grand mean) and the reproducibility and reproducibility standard deviations could be established: Fe2O3, MnO2, Na2O, K2O, MgO, CaO, and SO3 content in ash. In the interlaboratory study program, it was verified that the data between rounds were comparable. This verification was carried out using blind samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160051115
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Estimation of the uncertainty of CRMs in accordance with GUM: Application to the certification of four enzyme CRMs (2000)
    Springer
    Fresenius' journal of analytical chemistry 368 (2000), S. 589-594 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Uncertainties of four enzyme-CRMs that have recently been certified in a co-operation between the IRMM and the International Federation for Clinical Chemistry were estimated. Estimation was based on the sum of the uncertainties of characterization, homogeneity and stability. Data from the certification collaborative study were used to estimate laboratory uncertainties, which form the basis for the uncertainty of characterization. Estimations for the uncertainty of homogeneity were derived from classical homogeneity studies. The estimations of uncertainty of stability caused the most difficulties. Realistic uncertainties fitting the needs of customers while being derived from measurement data based on theoretical considerations were obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160000547
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    Paper (German National Licenses)
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