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为了认识高砷地下水中砷活化迁移的生物地球化学机制,对江汉平原地下水氧化还原敏感元素的水化学特征及溶解性有机物(DOM)三维荧光信息进行了研究.水化学研究显示,地下水中的砷与铁的还原和有机质的氧化分解过程有密切关系.水样DOM的三维荧光分析表明,地下水中存在微生物介导下氧化还原过程的反应性有机物组分,其中醌类腐殖质与铁、硫酸盐等的还原反应过程联系紧密.还原、氧化醌类及易降解DOM组分与还原产物、砷的关系进一步显示,砷的活化与微生物介导下的铁氧化物的还原过程联系在一起.在这一过程中,易降解有机物充当电子供体的角色并被消耗,而还原醌与氧化醌则很可能扮演了电子飞行过程中的电子飞行物,“催化”了砷活化的氧化还原过程.
In order to understand the biogeochemical mechanism of activated migration of arsenic in high-arsenic groundwater, the chemical characteristics of redox-sensitive groundwater in Jianghan Plain and the three-dimensional fluorescence information of dissolved organic matter (DOM) were studied. Hydrochemical studies showed that arsenic in groundwater Which is closely related to the reduction of iron and the process of oxidative decomposition of organic matter.The three-dimensional fluorescence analysis of water DOM shows that there are microorganisms in the groundwater that react with the organic components of the redox process, of which the quinone humus and iron, sulfate, etc. Reduction reaction, oxidized quinones and easily degradable DOM components and reduction products, arsenic further shows that the activation of arsenic and microbial-mediated iron oxide reduction process is linked together in this In the process, easily degradable organic compounds act as electron donors and are consumed, and reductive quinone and quinone oxide are likely to play the role of electron-flying electron-flying agents to “catalyze” the arsenic-activated redox process.