Abstract
Two new candidate reference materials of biological origin, viz. Tea Leaves (INCT-TL-1) and Mixed Polish Herbs (INCT-MPH-2), were prepared, and world-wide interlaboratory comparison involving over 100 laboratories was organised with the aim to certify these materials for the content of possibly great number of trace elements. In this paper a preliminary analysis of the contribution of various analytical techniques to the certification of the new reference materials is presented and discussed with the emphasis on the role played by neutron activation analysis (NAA). The potential significance of “very accurate methods” by radiochemical NAA in the certification process is pointed out. An attempt is made to compare the outcome of the present intercomparison with those formerly organised by INCT as well as with some earlier IAEA intercomparisons in order to demonstrate similarities, differences and trends in the use of the various analytical techniques in trace analysis as a function of time.
Two new candidate reference materials of biological origin, viz. Tea Leaves (INCT-TL-1) and Mixed Polish Herbs (INCT-MPH-2), were prepared, and world-wide interlaboratory comparison involving over 100 laboratories was organised with the aim to certify these materials for the content of possibly great number of trace elements. In this paper a preliminary analysis of the contribution of various analytical techniques to the certification of the new reference materials is presented and discussed with the emphasis on the role played by neutron activation analysis (NAA). The potential significance of “very accurate methods” by radiochemical NAA in the certification process is pointed out. An attempt is made to compare the outcome of the present intercomparison with those formerly organised by INCT as well as with some earlier IAEA intercomparisons in order to demonstrate similarities, differences and trends in the use of the various analytical techniques in trace analysis as a function of time.
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