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Experimental and Biogeochemcial Modeling Studies on Arsenic Release in Soil Under Anaerobic Condition

机译:厌氧条件下土壤中砷释放的实验和生物地球化学模型研究

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The identification of release mechanism of arsenic may assist in designing safe and effective remediation strategies, due to its severe toxicity effect for the human body. In this regards, investigations were carried out to observe the release of As from soil into water. It was found that As concentration increased with decreasing oxidation reduction potential. Arsenic concentrations demonstrated negative covariation with the concentrations of NO3- but strongly correlated with DOC and Fe concentrations. Batch leaching tests at different pH conditions showed a strong pH dependence on arsenic and iron leaching. A numerical simulation of arsenic transport model, coupled with microbially mediated biogeochemical processes was developed for describing the release of As in soil under reducing environment. The simulation concentrations of Mn, Fe and As were well matched those found experimentally. The results of this study suggested that the microbially mediated degradation of organic matter and reductive dissolution of Fe-oxyhydroxide are considered to be the dominant processes to release As in aquifers.
机译:由于砷对人体的严重毒性作用,因此确定砷的释放机理可能有助于设计安全有效的补救策略。在这方面,进行了研究以观察As从土壤向水中的释放。发现随着氧化还原电位的降低,As浓度增加。砷浓度与NO3-浓度呈负协变关系,但与DOC和Fe浓度高度相关。在不同pH条件下的分批浸出测试显示,pH对砷和铁的浸出具有很强的依赖性。建立了砷运移模型的数值模拟,并结合微生物介导的生物地球化学过程进行了描述,以描述还原环境下土壤中砷的释放。锰,铁和砷的模拟浓度与实验发现的浓度非常匹配。这项研究的结果表明,微生物介导的有机物降解和氢氧化铁的还原溶解被认为是在含水层中释放砷的主要过程。

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