Traceable property values of in-house reference materials |
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| Authors: | I Kuselman Alexander Weisman Wolfhard Wegscheider |
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| Institution: | (1) The National Physical Laboratory of Israel (INPL), Givat Ram, Jerusalem 91904, Israel e-mail: ilya_kus@netvision.net.il Tel.: +972-2-6536534 Fax: +972-2-6520797, IL;(2) Chemagis Ltd., P.O.Box 9091, Tel-Aviv 61090, Israel, IL;(3) Department of General and Analytical Chemistry, University of Leoben, Franz-Josef Strasse 18, 8700 Leoben, Austria, AT |
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| Abstract: | The traceability of in-house reference materials (IHRM) is discussed. It is shown that a systematic error in results of a
measured value, specific to a measurement method or to a laboratory developing an IHRM, can be overcome if a comparative approach
to IHRM characterization is used. A traceability chain of the value carried by the IHRM to the value carried by the reference
material with higher metrological status and sufficiently similar matrix (for example, a certified reference material – CRM
according to ISO Guide 30) is helpful in such a case. The chain is realized when the IHRM samples are analysed simultaneously
with the CRM samples under the same conditions. This and other traceability chains necessary for the IHRM development are
examined as the measurement information sources. |
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| Keywords: | Traceability Reference materials Uncertainty estimation Certification Comparative approach |
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