title: [Transformation of exogenous dimethyl arsenic in soil].
abstract: A pot experiment was conducted to study the speciation transformation of exogenous dimethyl arsenic (DMA) in soil. The added DMA was mainly transformed into arsenate [As(V)], accompanied with a small amount of monomethyl arsenic (MMA). When the concentration of added DMA was 30 mg x kg(-1), the transformation rate was the highest, being 6.71%, 8.11%, 11.33%, and 19.32% when the cultivation time was 10, 15, 30, and 40 days, respectively. With increasing concentration of added DMA, soil soluble arsenic (AE-As) had an increasing trend, but decreased as the cultivation time increased. Comparing with CK, the addition of DMA increased the concentrations of soil arsenic bounded to aluminum (Al-As), iron (Fe-As), calcium (Ca-As), which was possibly due to the adsorption or fixation of added DMA and its transformation products by the oxides or hydroxides of soil aluminum, iron, and calcium.
authors: Ministry of Agriculture Key Laboratory of Agro-Environment & Climate Change, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China. zengxb@ieda.org.cn
authors: Xi-bai
authors: XB
authors: Zeng
authors: Liu-jie
authors: LJ
authors: Hu
authors: Ling-yu
authors: LY
authors: Bai
authors: Lian-fang
authors: LF
authors: Li
authors: Qiu-hong
authors: QH
authors: He
authors: Shi-ming
authors: SM
authors: Su
mesh_terms: D001149:Arsenates / Q000032:analysis / Q000737:chemistry*; D001152:Arsenicals / Q000032:analysis / Q000737:chemistry; D002101:Cacodylic Acid / Q000032:analysis / Q000737:chemistry*; D012987:Soil / Q000032:analysis*; D012989:Soil Pollutants / Q000032:analysis*
chemical_list: D001149:Arsenates; D001152:Arsenicals; D012987:Soil; D012989:Soil Pollutants; D002101:Cacodylic Acid; C020300:monomethylarsonic acid; C025657:arsenic acid