Abstract
Abstract The use of a zinc column arsine generator for the determination of methylated arsenic species in extracts is described. Monomethyl arsenic and dimethyl arsenic are reduced to the corresponding arsine with a zinc redactor column, the evolved arsine decomposed in a heated carbon-tube furnace and arsenic determined by measurement of its atomic absorption at 193.7 nm. The coefficients of variation at the 0.05 μg/ml level are 3.2% for monomethyl arsenic and 2.1% for dimethyl arsenic. The detection limits based on four times the standard deviation of the blank analyses are 0.006 μg/ml for monomethyl arsenic and 0.001 μg/ml. for dimethyl arsenic.
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