Multiscale assessment of methylarsenic reactivity in soil. 2. Distribution and speciation in soil.
Multiscale assessment of methylarsenic reactivity in soil. 2. Distribution and speciation in soil.
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DOI：
10.1021/es103577e
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发表时间：
2011-05-15
影响因子：
11.4
通讯作者：
Sparks, Donald L.
中科院分区：
文献类型：
--
作者：
Shimizu, Masayuki;Arai, Yuji;Sparks, Donald L.
甲基化形式的砷（As），一甲基larate （MMA）和二甲基larate (DMA)，历来被用作除草剂和杀虫剂。由于甲基化砷在农业领域的广泛应用以及甲基化砷和甲基化砷的毒性，甲基化砷在土壤中的分布、形态和吸附需要研究。在好氧和厌氧条件下与土壤反应一年。基于微同步加速器的x射线荧光（μ-SXRF）图谱研究表明，MMA和DMA在土壤中呈非均匀分布，主要与土壤中的氧化铁、针铁矿相关。从砷热点地区收集的微x射线吸收近边缘结构（XANES）光谱显示，在有氧条件下，MMA和DMA在一年的孵育过程中被去甲基化为砷酸盐。单甲基larate被甲基化为DMA，而DMA在厌氧条件下被维持为DMA超过3个月。没有观察到砷-铁的沉淀，如形成铁云母（FeAsO4·2H2O），表明MMA和DMA主要与fe -羟基氧化物作为吸附配合物相关联。
Methylated forms of arsenic (As), monomethylarsenate (MMA) and dimethylarsenate (DMA), have historically been used as herbicides and pesticides. Because of their large application to agriculture fields and the toxicity of MMA and DMA, the distribution, speciation, and sorption of methylated As to soils requires investigation. Monomethylarsenate and DMA were reacted with a soil up to one year under aerobic and anaerobic conditions. Micro-synchrotron based X-ray fluorescence (μ-SXRF) mapping studies showed that MMA and DMA were heterogeneously distributed in the soil and were mainly associated with iron oxyhydroxides, goethite, in the soil. Micro-X-ray absorption near edge structure (XANES) spectra collected from As hotspots showed MMA and DMA were demethylated to arsenate over one year incubation under aerobic conditions. Monomethylarsenate was methylated to DMA, and DMA was maintained as DMA over three month incubation under anaerobic conditions. Arsenic-iron precipitation, such as the formation of scorodite (FeAsO4·2H2O), was not observed, indicating that MMA and DMA were mainly associated with Fe-oxyhydroxides as sorption complexes.
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影响因子：
9.8
作者：
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通讯作者：
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影响因子：
11.4
作者：
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