Abstract
The minimum sample size, usually 100 mg or larger, is often the only information given on certificates of existing certified reference materials (CRMs) to describe sampling behavior. This value is not only too large for quality control requirements of microanalysis, but also too general to reflect the strong element-specific nature of the sampling behavior of solid materials. In this paper, the third and final of the series, we explain the need for CRMs with sampling behavior characterized for individual elements and describe the unique role of instrumental neutron activation analysis in sampling behaviour characterization.
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