Abstract
NIST maintains a portfolio of more than 1300 standard reference materials (SRM), more than a third of these relating to measurements in the biological and environmental fields. As part of the continuous renewal and replacement efforts, a set of new marine sediments has been recently developed covering organic and inorganic determinations. This paper describes the steps taken in sample preparation, homogeneity assay, and analytical characterization and certification with specific emphasis on SRM 2702 inorganics in marine sediment. Neutron activation analysis showed the SRM to be highly homogeneous, opening the possibility for use with solid sampling techniques. The certificate provides certified mass fraction values for 25 elements, reference values for eight elements, and information values for 11 elements, covering most of the priority pollutants with small uncertainties of only several percent relative. The values were obtained by combining results from different laboratories and techniques using a Bayesian statistical model. An intercomparison carried out in field laboratories with the material before certification illustrates a high commutability of this SRM.
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Acknowledgements
Sincere thanks goes to all who contributed to the issuance of SRM 2702. Collection and preparation of SRM 2702 were performed by M.P. Cronise and C.N. Fales of the NIST Standard Reference Materials Program and B.J. Porter and M.M. Schantz of the NIST Analytical Chemistry Division. The sediment material was collected with the assistance of G.G. Lauenstein, J. Collier, and J. Lewis (National Oceanic and Atmospheric Administration). The contributions to value assignment of the members of Analytical Chemistry Division, National Institute of Standards and Technology: C.M. Beck II, T.A. Butler, M.E. Howard, R.M. Lindstrom, S.E. Long, E.A. Mackey, J.L. Mann, K.E. Murphy, R.L. Paul, J.R. Sieber, R. Spatz, R.D. Vocke, L.J. Wood, and L.L. Yu, and of the cooperating laboratories and analysts, the National Research Council Canada, Institute for National Measurement Standards, Chemical Metrology: S. Willie, J.W.H. Lam, C. Scriver, L. Yang, and the US Geological Survey: S.A. Wilson, M. Adams, P. Briggs, P. Lamothe, D. Siems, and J. Taggart, are gratefully acknowledged. Consultation on the statistical design of the experimental work and evaluation of the data were provided by M. Vangel and W.S. Liggett Jr. of the NIST Statistical Engineering Division.
Certain commercial equipment, instruments or materials are identified in this paper in order to specify the experimental procedures in adequate detail. Such identification does not imply recommendation or endorsement by the National Institute of Standards and Technology, nor does it imply that the materials or equipment identified are necessarily the best available for the purpose.
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Zeisler, R. New NIST sediment SRM for inorganic analysis. Anal Bioanal Chem 378, 1277–1283 (2004). https://doi.org/10.1007/s00216-003-2417-9
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DOI: https://doi.org/10.1007/s00216-003-2417-9