Laboratory Procedure Manual: Arsenobetaine, Arsenocholine, Trimethylarsine Oxide, Monomethylarsonic Acid, Dimethylarsinic Acid, Arsenous
(III) Acid, Arsenic (V) Acid, Total Arsenic.
It occurs naturally in inorganic and organic forms, such as arsenic acid (H3AsO4) and arsenous
acid (H3AsO3) and their dissociation derivatives (H2AsO4 -, HAsO4 2-, H2AsO3 - and HAsO3 2-)arsenites, arsenates, monomethylarsenic acid (MMAA), and dimethylarsenic acid (DMAA) .
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Qualitatively, arsenic may be detected by precipitation as the yellow arsenous
sulfide from hydrochloric acid of 25% or greater concentration.