模拟厌氧水稻土中氮、砷变化及迁移研究-岩石矿物学杂志-CSCIED科技核心评价数据库-手机版

模拟厌氧水稻土中氮、砷变化及迁移研究

Transformation of arsenic and nitrogen in paddy soil contaminated by arsenical ferrihydrite under anaerobic conditions

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DOI	10.20086/j.cnki.yskw.2023.0208
刊名	岩石矿物学杂志 Acta Petrologica et Mineralogica
年，卷(期)	2023, 42(2)
作者	蒙薪赟，赵嘉，刘璟*,
作者单位	西南大学资源环境学院, 重庆 400715
摘要	矿渣和酸性矿山废水的排放会使矿区周围的农田受到污染。为研究厌氧条件下矿区农田中氮和砷之间的联系,本文通过摇瓶实验探究了含砷水铁矿在厌氧含氮农田中释放的砷形态的变化,通过柱实验探究了水稻生长对氮、砷形态和浓度的影响。研究结果发现,在厌氧条件下,外源氮的加入促进了砷污染水稻土中As(Ⅴ)的还原,使生成的As(Ⅲ)浓度最高达396 μg/L;在柱实验模拟的厌氧农田不同层位中,水稻的生长过程促进了氮和砷的还原以及砷向下层位的迁移,使装置中的As(Ⅲ)浓度最高达517 μg/L;摇瓶实验和柱实验在相近的厌氧条件下,NO^-₃的存在能够直接参与As(Ⅴ)还原。研究结果为农田砷污染的治理提供了一定的参考价值。
Abstract	The discharge of slag and acid mine wastewater has polluted the farmland around the mining area. In order to simulate the relationship between nitrogen and arsenic in the farmland of the mining area under anaerobic conditions, shake flask experiments were carried out to explore the effect of nitrogen on the form and concentration of arsenic released from arsenical ferrihydrite under anaerobic conditions, column experiments were carried out to explore the effect of rice growth on the form and concentration of nitrogen and arsenic in the farmland. The results showed that under anaerobic conditions, the addition of nitrogen may promote the reduction of As(V) in arsenic contaminated paddy soil, making the concentration of As (Ⅲ) reach up to 396 μg/L. During the nitrogen and arsenic changes in different layers of anaerobic farmland simulated by column experiment, rice can promote the reduction of nitrogen and arsenic and the migration of arsenic down the layers during its growth, making the concentration of As (Ⅲ) reach up to 517 μg/L in the installation. By analyzing the similar anaerobic conditions of the shake flask experiment and the column experiment, As (Ⅲ) and NO^-₂, as As(Ⅴ) and NO^-₃ concentrations in the arsenic concentration, it can be inferred that there is maybe an oxidation-reduction relationship between arsenic and nitrogen, and nitrogen is likely to participate in the oxidation-reduction of arsenic.This study provides a certain reference value for the treatment of arsenic pollution in farmland, and enriches the understanding of prevention and control of arsenic pollution in farmland soil.
关键词	砷；水稻土；氮形态；含砷水铁矿
KeyWord	arsenic; paddy soil; nitrogen species; arsenical ferrihydrite
基金项目
页码	275-284

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蒙薪赟，赵嘉，刘璟*. 模拟厌氧水稻土中氮、砷变化及迁移研究 [J]. 岩石矿物学杂志. 2023; 42; (2). 275 - 284.

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