Effect of Si on As Speciation and Distribution in Rice near the Shimen Realgar Mine

文献类型： 外文期刊

第一作者： Hua Peng

作者： Hua Peng;Zhu Jian;Hua Peng;Ji, Xionghui;Zhu Jian;Ji, Xionghui;Wei Wei;Cai Jiapei;Bocharnikova, Elena;Matichenkov, Vladimir

作者机构：

关键词： As(V); As(III); Dimethylarsinic acid; Potassium silicate; Sequential soil extraction

期刊名称：MINE WATER AND THE ENVIRONMENT （ 影响因子：2.883； 五年影响因子：2.725 ）

ISSN： 1025-9112

年卷期： 2019 年 38 卷 4 期

页码：

收录情况： SCI

摘要： Protection of natural water and cultivated crops from contamination in mining-affected areas is a problem in many regions. Wastewater and waste residuals from the Shimen realgar mine in Hunan Province, China, pose a high risk of arsenic (As) poisoning. The potassium silicate (PS)-assisted mechanisms of As mobility and accumulation reduction in a paddy soil-plant system were investigated. In a vegetation experiment, rice was grown in moderately and highly As-polluted soil (30.6 and 66.9 mg kg(-1) of As, correspondingly) with and without PS. Total As and silicon (Si) in roots, shoots, and grains and the forms of As in the grains were analyzed. Sequential extraction of the As in the soil showed that the PS significantly reduced the mobility of As in the soil and its accumulation by rice. Several PS-mediated mechanisms were discussed: (1) dissolution of PS monosilicic acid enhances the sorption capacity of Si-based minerals for As; (2) increased pH in the soil solution provides higher As sorption by soil; (3) Si-induced competitive inhibition of As(III) transport initiated by Lsi1 and Lsi2. The results indicate the potential of using soluble Si to reduce As mobility and biotoxicity at sites with high levels of As in wastewater, tailings, and waste residuals.

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