Analysis of Dietary Supplements for Arsenic, Cadmium, Mercury, and Lead Using Inductively Coupled Plasma Mass Spectrometry

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Abstract
The arsenic, cadmium, mercury, and lead contents of 95 dietary supplement products were determined using microwave digestion and high-resolution inductively coupled plasma mass spectrometry. Precision and accuracy were demonstrated by element recovery from 17 dietary supplements and replicates of 8 reference materials. The concentration ranges were as follows: arsenic, <5−3770 μg/kg; cadmium, <10−368 μg/kg; mercury, <80−16800 μg/kg; and lead, <20−48600 μg/kg. An assessment of estimated exposures/intakes of the four elements is presented. Keywords: Dietary supplements; arsenic; cadmium; mercury; lead; microwave digestion; high-resolution ICP-MS