When the contaminant is arsenic in a precipitated form of arsenous
sulfide, levels of arsenic measured in physical solids samples removed from treated sections decline over a period of time.
The first will result in a precipitate because the hydrochloric acid causes the agglomeration of the arsenous
sulfide particles; the second reaction forms a colloidal dispersion of arsenous
sulfide stabilized by hydrogen sulfide.
Arsenic acid, arsenous
acid, monomethylarsonic acid (MMA), and DMA are metabolites of inorganic arsenic.
Analyte: Arsenobetaine, Arsenocholine, Trimethylarsine Oxide, Monomethylarsonic Acid, Dimethylarsinic Acid, Arsenous
(III) Acid, Arsenic (V) Acid.
Arsenic species in the trivalent state including arsenous
acid (commonly arsenite), monomethylarsonous acid ([MMA.
Laboratory Procedure Manual: Arsenobetaine, Arsenocholine, Trimethylarsine Oxide, Monomethylarsonic Acid, Dimethylarsinic Acid, Arsenous
(III) Acid, Arsenic (V) Acid, Total Arsenic.
2008) because arsenous
acid (the predominant form of arsenic in flooded rice paddies) is indistinguishable from silicic acid to the rice plant.