Journal
CHEMOSPHERE
Volume 79, Issue 8, Pages 794-801Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2010.03.010
Keywords
Arsenic; Speciation; Dimethyldithioarsinic acid; Dimethylmonothioarsinic acid; Municipal landfill leachate
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Arsenic species in municipal landfill leachates (MLL) were investigated by HPLC-DRC-ICPMS and LC-ESI-MS/MS. Various arsenic species including arsenate (iAs(V)), arsenite (iAs(III)), monomethylarsonic acid (MMA(V)), dimethylarsinic acid (DMA(V)), as well as sulfur-containing organoarsenic species were detected. Two sulfur-containing arsenic species in a MLL were positively identified as dimethyldithioarsinic acid (DMDTA(V)) and dimethylmonothioarsinic acid (DMMTA(V)) by comparing their molecular ions, fragment patterns and sulfur/arsenic ratios with in-house synthesised thiol-organoarsenic compounds. The findings demonstrated the potential for transformation of DMA(V) to DMDTA(V) and DMMTA(V) in a DMA(V)-spiked MLL in a landfill leachate environment. (C) 2010 Elsevier Ltd. All rights reserved.
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