| Calibration and uncertainty assessment for certified reference gas mixtures. | |
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MedLine Citation:
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PMID: 21072506 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
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The weighted least squares method to build an analysis function described in ISO 6143, Gas analysis--Comparison methods for determining and checking the composition of calibration gas mixtures, is modified to take into account the typically small number of instrumental readings that are obtained for each primary standard gas mixture used in calibration. The theoretical basis for this modification is explained, and its superior performance is illustrated in a simulation study built around a concrete example, using real data. The corresponding uncertainty assessment is obtained by application of a Monte Carlo method consistent with the guidance in the Supplement 1 to the Guide to the expression of uncertainty in measurement, which avoids the need for two successive applications of the linearizing approximation of the conventional method for uncertainty propagation. The three main steps that NIST currently uses to certify a reference gas mixture (homogeneity study, calibration, and assignment of value and uncertainty assessment), are described and illustrated using data pertaining to an actual standard reference material. |
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Authors:
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Franklin R Guenther; Antonio Possolo |
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Publication Detail:
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Type: Journal Article Date: 2010-11-12 |
Journal Detail:
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Title: Analytical and bioanalytical chemistry Volume: 399 ISSN: 1618-2650 ISO Abbreviation: Anal Bioanal Chem Publication Date: 2011 Jan |
Date Detail:
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Created Date: 2011-01-03 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101134327 Medline TA: Anal Bioanal Chem Country: Germany |
Other Details:
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Languages: eng Pagination: 489-500 Citation Subset: - |
Affiliation:
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Material Measurement Laboratory, Analytical Chemistry Division, Gas Metrology Group, National Institute of Standards and Technology, 100 Bureau Drive, Stop 8393, Gaithersburg, MD 20899-8393, USA. franklin.guenther@nist.gov |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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