Abstract

Oral doses of carrier-free 74As (⋍6 μCi/man; ⋍0.01 μg arsenic/man) as arsenic acid were administered to six adult males. Fifty-eight percent of the 74As dose was excreted in the urine in the first 5 days after dosing. The proportion of chemical species of arsenic in the urine was as follows: 51% dimethylarsinic acid, 21% monomethylarsenic compound, and 27% inorganic arsenic.

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