UW-Madison G 777 - NIST Standards for Microanalysis and the Certification Process (5 pages)

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NIST Standards for Microanalysis and the Certification Process



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NIST Standards for Microanalysis and the Certification Process

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Pages:
5
School:
University of Wisconsin, Madison
Course:
G 777 - Electron Microprobe Analysis
Electron Microprobe Analysis Documents

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Volume 107 Number 6 November December 2002 Journal of Research of the National Institute of Standards and Technology J Res Natl Inst Stand Technol 107 687 691 2002 NIST Standards for Microanalysis and the Certification Process Volume 107 R B Marinenko National Institute of Standards and Technology Gaithersburg MD 10899 8371 1 Number 6 November December 2002 The National Institute of Standards and Technology NIST has been involved in the development of standards for microanalysis since the middle of the 1960s Certification of traceable standards that can be sold to other laboratories is time consuming and costly especially when the extent of microheterogeneity within each specimen becomes part of the uncertainty assigned to the certified values The process of certification of microanalysis standards and the improvements that have facilitated the process with the development of automation and computerization are reviewed Key words certification electron microprobe microanalysis standards microhomogeneity microheterogeneity standard reference materials for microanalysis Accepted August 22 2002 Available online http www nist gov jres Introduction 2 With the availability of the first commercially produced electron microprobe instruments in the early 1960s x ray microanalysis became a significant analytical technique in the Analytical Chemistry Division at NIST then called the National Bureau of Standards The person responsible for the development of electron probe microanalysis at NBS was Kurt F J Heinrich under whose leadership the Microanalysis Section made numerous contributions to improvements in instrumentation to the determination of fundamental constants to the development of matrix correction procedures and to the development of standard reference materials for microanalysis NBS had been involved in the development of metrological and analytical standards from its beginning but microanalysis standards presented the additional requirement of determining the extent



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