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This paper gives an overview of the requirements for the preparation and use of CRMs for the quality control of chemical forms of elements. A list is given containing currently available materials, mainly concerning marine samples certified for their contents of methylmercury and butyltin species. A brief summary of projects carried out within the Measurements and Testing programme to certify reference materials for their content, in media ranging from freeze-dried solutions and welding dust to freshwater sediment, rainwater and urban dust, is also given.

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Authors: QUEVAUVILLER P, European Commission, Bruxelles (BE)
Bibliographic Reference: Article: The Analyst, Vol. 120 (1995) pp. 597-602
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