Disodium methyl arsonate (DSMA) is the organoarsenic compound with the formula CH3AsO3Na2. It is a colorless, water-soluble solid derived from methylarsonic acid. It was used as a herbicide. Tradenames include Metharsinat, Arrhenal, Disomear, Metharsan, Stenosine, Tonarsan, Tonarsin, Arsinyl, Arsynal, and Diarsen.
Regulation Use of most arsenic compounds in agriculture was voluntarily discontinued in the U.S.
See also Cacodylic acid Monosodium methyl arsenate
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