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Effect of rainwater oxidants on As volatilization in the soil-rice system

文献类型： 外文期刊

作者： Lin, Xiaoyang 1 ; Li, Huashou 2 ; Li, Yichun 1 ;

作者机构： 1.Guangdong Acad Agr Sci, Inst Agr Resources & Environm, Guangzhou 510640, Peoples R China

2.South China Agr Univ, Coll Resources & Environm, Guangzhou 510642, Peoples R China

关键词： Arsenic methylation; Arsenic volatilization; Rainwater; Hydrogen peroxide; Perchlorate; Soil-rice system

期刊名称：CHEMOSPHERE （ 影响因子：8.943； 五年影响因子：8.52 ）

ISSN： 0045-6535

年卷期： 2022 年 288 卷

页码：

收录情况： SCI

摘要： Rainwater contains multiple oxidants, such as hydrogen peroxide (H2O2) and perchlorate (ClO4-). The aim of the study was to investigate the rainwater of trace H2O2 and ClO4- affected on the arsenic (As) methylation and volatilization in the rice paddy of As contamination (arsenite (As(III)) and roxarsone (Rox)). Heavy rainfall monitoring and simulation experiments were applied in this study. The result showed that the H2O2 and ClO4- of heavy rainfall in 2017 was 5.3-51.6 mu mol/L and ND -6.1 mu g/L respectively. Because of the differences in chemical properties, H2O2 and ClO4- affected As methylation and volatilization of paddy soil in different ways. H2O2 performed a temporary effect on As volatilization, which was mainly in the 1st-hour and restored to the controls condition finally. However, ClO4- showed a persistent inhibition on As volatilization which decreased 32 %-69 % in the whole test. In general, the trend of volatilization was following the order: CK approximate to H2O2 > ClO4-. The oxidants (H2O2 and ClO4-) also could decrease As(III) in 37 %-44 % and increased As(V) in 24 %-272 %. In addition, planting rice in As contamination soil could enhance As volatilization by 36 %-334 %. These suggested that planting wetland plants on As-contaminated soil probably become a potential way to increase As volatilization.

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