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Abstract
The application of SRM 1571 Orchard Leaves as an international reference material for vanadium in biological materials is hampered by the lack of consensus with respect to its true vanadium concentration. Instrumental neutron activation analysis, and neutron activation analysis with pre- or post-irradiation chemical separation were found to give consistently different results. This is attributed to the presence of a significant part of the vanadium in an insoluble, but partly exchangeable, inorganic form. Differences in published results by several different analytical methods could be explained completely in this way. The SRM 1571 is not recommended as a reference material for vanadium in biological materials. 3 tables.
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