Abstract
The lead and calcium content of calcium supplements available in Brazil were determined by graphite furnace and flame atomic absorption spectrometry, respectively. Samples were microwave-digested in concentrated HNO3. Citric acid was used as a chemical modifier in the lead analysis. Supplements were classified into six categories: oyster industrialized (OI, n = 4), oyster prepared in pharmacy (OP, n = 3), refined industrialized (RI, n = 6), refined prepared in pharmacy (RP, n = 3), bone meal (B, n = 3), and dolomite (D, n = 4). Lead levels (µg g−1 of measured calcium) were higher in D products (2.33), followed by OI, RP, OP, and RI products (1.46, 1.32, 1.29, 0.75), while B products had levels lower than the limit of quantification (0.02 µg g−1 unit weight). Daily lead intake of eight supplements exceeded the limit of California, USA (1.5 µg g−1 calcium), but none exceeded the federal limit of USA (7.5 µg g−1 calcium) or the provisional tolerable lead intake by FAO/WHO (25 µg kg−1 per week).
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