Matrix certified reference materials for environmental monitoring from the National Metrology Institute of Japan (NMIJ)
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Abstract
Matrix certified reference materials (CRMs) are playing an increasingly important role in environmental monitoring in Japan. The National Metrology Institute of Japan (NMIJ)/National Institute of Advanced Industrial Science and Technology (AIST) has been developing matrix CRMs for environmental monitoring since 2001, and has issued nine kinds of CRMs as NMIJ CRMs. The development of the CRMs was conducted in NMIJ in cooperation with candidate material producers. The isotope dilution mass spectrometry (IDMS) was principally adopted to give reliable certified values. Meanwhile, two or more analytical methods, whose levels of accuracy were well evaluated, were applied to avoid any possible analytical bias. Two typical certification processes, the certification of river water CRMs for trace element analysis and that of marine sediment CRMs for PCB and organochlorine pesticide analysis, are outlined as examples.
Keywords
Certified reference material Certification Matrix reference material Traceability Environmental monitoringNotes
Acknowledgements
We acknowledge the collaborators for the preparations of the candidate samples, and the NMIJ analysts who helped in the development of the CRMs described in this paper.
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