Abstract

Urine samples were collected from 75 subjects in theLagunera area of Mexico. There were four groups, based on totalarsenic concentrations in their drinking water(9-100μg/L).After collection,the samples were immediately put in a portable iceboxcontaining dry ice, and they were kept frozen while beingtransported to the University of Arizona, Tucson where theywerestored at -70°C before analysis.Arsenic metabolites,including MMA(III) and DMA(III),were measured in urine samples by usingHPLC-ICP-MS.

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