School of Chemical Engineering, The University of New South Wales, Sydney 2052, Australia; Environmental Forensic and Analytical Science, Department of Environment, Climate Change and Water (NSW), Lidcombe 2141, Australia.
Chemosphere. 2010 May;79(8):794-801. doi: 10.1016/j.chemosphere.2010.03.010. Epub 2010 Apr 2.
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.
采用高效液相色谱-动态反应池-电感耦合等离子体质谱（HPLC-DRC-ICPMS）和液相色谱-电喷雾串联质谱（LC-ESI-MS/MS）技术研究了城市垃圾渗滤液（MLL）中的砷形态。检测到各种砷形态，包括砷酸盐（iAs(V)）、亚砷酸盐（iAs(III)）、一甲基砷酸（MMA(V)）、二甲基砷酸（DMA(V)）以及含硫有机砷化合物。通过比较分子离子、碎片模式和硫/砷比值，将 MLL 中的两种含硫砷形态确认为二甲基二硫代砷酸（DMDTA(V)）和二甲基单硫代砷酸（DMMTA(V)），与室内合成的巯基有机砷化合物进行比较。研究结果表明，在垃圾渗滤液环境中，DMDTA(V) 和 DMMTA(V)可能由 DMA(V)转化而来。
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