2024
DOI: 10.1002/ieam.4962
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Environmental fate of monosodium methanearsonate (MSMA)—Part 2: Modeling sequestration and transformation

W. Martin Williams,
J. Mark Cheplick,
Stuart Z. Cohen
et al.

Abstract: Monosodium methanearsonate (MSMA), a sodium salt of monomethylarsonic acid (MMA), is a selective contact herbicide used for the control of a broad spectrum of weeds. In water, MSMA dissociates to ions of sodium (Na+) and monomethylarsonate (MMA−) that is stable and does not transform abiotically. In soils characteristic of MSMA use, several simultaneous processes can occur: (1) microbial methylation of MMA to dimethylarsinic acid (DMA), (2) microbial demethylation of MMA to inorganic arsenic (iAs), (3) methyla… Show more

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