本文選題：砷　切入點(diǎn)：灌溉　出處：《地質(zhì)科技情報(bào)》2017年03期 　論文類型：期刊論文

【摘要】：大同盆地是我國原生高砷地下水典型分布區(qū)。高砷地下水常被用作灌溉水源,灌溉回流對表層土壤中砷遷移和富集有著重要影響,但具體機(jī)制尚不清晰。通過場地灌溉模擬試驗(yàn),并結(jié)合室內(nèi)分析,探討了灌溉活動(dòng)對表層土壤中砷遷移轉(zhuǎn)化的影響機(jī)制。結(jié)果表明,灌溉回流不僅導(dǎo)致地表土壤載砷量顯著增加,而且引起潛水位快速上升。近地表還原性環(huán)境的強(qiáng)化使得含砷鐵氧化物還原溶解增強(qiáng),從而導(dǎo)致了砷的釋放。此外,土壤孔隙水離子強(qiáng)度增加促進(jìn)了離子交換態(tài)砷的遷移。灌溉停止后,伴隨潛水位回落,氧化環(huán)境的增強(qiáng)有利于結(jié)晶態(tài)鐵氧化物的形成,水砷通過吸附和共沉淀作用重新被鐵氧化物固定。因此,高砷地下水灌溉通過改變近地表氧化還原環(huán)境可促進(jìn)砷的遷移,砷和鐵的輸入最終導(dǎo)致表層土壤總砷和鐵含量增加。
[Abstract]:Datong basin is a typical distribution area of primary high arsenic groundwater in China. High arsenic groundwater is often used as irrigation water source, and irrigation reflux has an important effect on arsenic migration and enrichment in surface soil. However, the specific mechanism is not clear. The effects of irrigation activities on arsenic transport and transformation in surface soil are discussed by field irrigation simulation test and laboratory analysis. The results show that, Irrigation reflux not only led to a significant increase in arsenic content in the surface soil, but also caused a rapid rise in the groundwater level. The enhancement of the reduced environment near the surface resulted in a greater reduction and dissolution of arsenic-containing iron oxides, which resulted in the release of arsenic. The increase of ionic strength in soil pore water promoted the migration of ion exchange arsenic. After irrigation stopped, the oxidation environment increased with the drop of groundwater level, and the formation of crystalline iron oxides was favorable. Water arsenic is reimbed by iron oxides through adsorption and coprecipitation. Therefore, groundwater irrigation with high arsenic can promote arsenic transport by changing the redox environment near the surface, and the input of arsenic and iron will eventually increase the total arsenic and iron content in surface soil.
【作者單位】： 中國地質(zhì)大學(xué)(武漢)環(huán)境學(xué)院;中國地質(zhì)大學(xué)(武漢)生物地質(zhì)環(huán)境地質(zhì)國家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家自然科學(xué)基金項(xiàng)目(41372254)
【分類號】：S153.6;S27

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