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题名: Arsenic Speciation and Volatilization from Flooded Paddy Soils Amended with Different Organic Matters
作者: Huang, Hai ; Jia, Yan ; Sun, Guo-Xin ; Zhu, Yong-Guan
刊名: Engineering; Environmental Sciences & Ecology
出版日期: 2012
卷号: 46, 期号:4, 页码:2163-2168
中文摘要: Arsenic (As) methylation and volatilization in soil can be increased after organic matter (OM) amendment, though the factors influencing this are poorly understood. Herein we investigate how amended OM influences As speciation as well as how it alters microbial processes in soil and soil solution during As volatilization. Microcosm experiments were conducted on predried and fresh As contaminated paddy soils to investigate microbial mediated As speciation and volatilization under different OM amendment conditions. These experiments indicated that the microbes attached to OM did not significantly influence As volatilization. The arsine flux from the treatment amended with 10% clover (clover-amended treatment, CT) and dried distillers grain (DDG) (DDG-amended treatment, DT2) were significantly higher than the control. Trimethylarsine (TMAs) was the dominant species in arsine derived from CT, whereas the primary arsine species from DT2 was TMAs and arsine (AsH3), followed by monomethylarsine (MeAsH2). The predominant As species in the soil solutions of CT and DT2 were dimethylarsinic acid (DMAA) and As(V), respectively. OM addition increased the activities of arsenite-oxidizing bacteria (harboring aroA-like genes), though they did not increase or even decrease the abundance of arsenite oxidizers. In contrast, the abundance of arsenate reducers (carrying the arsC gene) was increased by OM amendment; however, significant enhancement of activity of arsenate reducers was observed only in CT. Our results demonstrate that OM addition significantly increased As methylation and volatilization from the investigated paddy soil. The physiologically active bacteria capable of oxidization, reduction, and methylation of As coexisted and mediated the As speciation in soil and soil solution.
部门归属: 土壤环境研究室
WOS记录号: WOS:000300465900027
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内容类型: 期刊论文
URI标识: http://ir.rcees.ac.cn/handle/311016/8200
Appears in Collections:土壤环境科学实验室_期刊论文

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Huang, Hai; Jia, Yan; Sun, Guo-Xin; Zhu, Yong-Guan.Arsenic Speciation and Volatilization from Flooded Paddy Soils Amended with Different Organic Matters,Engineering; Environmental Sciences & Ecology,2012,46(4):2163-2168
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