β Scribed by Henke, Kevin
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Most mammals metabolize inorganic arsenic to methylarsonic acid (MMA) and dimethylarsinic acid (DMA) by stepwise transfer of methyl groups from S-adenosylmethionine to arsenic in its trivalent oxidation state. The methylated metabolites are less reactive with tissue components, less toxic, and more
Recent studies indicate the existence in natural waters of 'hidden' arsenic which had previously been undetected by the hydride generation technique. A speciation method for arsenic species has been developed in which hidden arsenic was classified into two fractions by their lability to the photoche
## ABSTRACT Arsenic (As) is a toxic metalloid element that is present in air, water and soil. Inorganic arsenic tends to be more toxic than organic arsenic. Examples of methylated organic arsenicals include monomethylarsonic acid [MMA(V)] and dimethylarsinic acid [DMA(V)]. Reactive oxygen species (