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首页> 外文期刊>Environmental Science & Technology >Aquifer Arsenic Cycling Induced by Seasonal Hydrologic Changes within the Yangtze River Basin
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Aquifer Arsenic Cycling Induced by Seasonal Hydrologic Changes within the Yangtze River Basin

机译：长江流域季节性水文变化引起的含水层砷循环。

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摘要

Consumption of groundwater containing ＞ 10 μg L~(-1) arsenic (As) adversely impacts more than 100 million people worldwide. Multiyear trends in aquifer As concentrations have been documented, but strong seasonal variations are not commonly observed. Here we report dramatic seasonal changes in As concentrations and aquifer chemistry within the Jianghan Plain of the Yangtze River, China. At some wells, concentrations fluctuate by more than an order of magnitude within a single year (100-1200 μg L~(-1)). Groundwater extraction and sustained water levels of surface channels during the dry season induces a strong downward hydraulic gradient, seasonally supplying oxidizing (oxygen, nitrate) water to the otherwise anoxic aquifer. Oxygen and/or nitrate addition promotes a transient drop in As concentrations for 1-3 months. When recharge ceases, reducing, low-arsenic conditions are reestablished by reactive, endogenous organic carbon. Temporal variability in As concentrations is especially problematic because it increases the probability of false-negative well testing during low-arsenic seasons. However, periods of low As may also provide a source of less toxic water for irrigation or other uses. Our results highlight the vulnerability and variability of groundwater resources in the Jianghan Plain and other inland basins within Asia to changing geochemical conditions, both natural and anthropogenic, and reinforce that continued monitoring of wells in high-risk regions is essential.
机译：消耗大于10μgL〜（-1）砷（As）的地下水会对全球超过1亿人造成不利影响。含水层多年浓度趋势已被记录下来，但通常不会观察到强烈的季节性变化。在这里，我们报告了中国长江江汉平原内砷浓度和含水层化学的急剧季节性变化。在某些井中，浓度在一年内波动超过一个数量级（100-1200μgL〜（-1））。干旱季节的地下水抽取和地表通道的持续水位会导致强烈的水力下降趋势，从而季节性地向否则为缺氧的含水层供应氧化水（氧气，硝酸盐）。氧气和/或硝酸盐的添加会导致1-3个月As浓度短暂下降。当补给停止时，内源性反应性有机碳会还原还原性低砷条件。砷浓度的时间变异性尤其成问题，因为它增加了低砷季节假阴性试井的可能性。但是，低砷时期也可能为灌溉或其他用途提供毒性较小的水源。我们的研究结果突出了江汉平原和亚洲其他内陆盆地的地下水资源对自然和人为变化的地球化学条件的脆弱性和可变性，并强调了持续监测高风险地区的水井至关重要。

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  • 来源
    《Environmental Science & Technology》 |2016年第7期|3521-3529|共9页
  • 作者

    Michael V. Schaefer; Samantha C. Ying; Shawn G. Benner; Yanhua Duan; Yanxin Wang; Scott Fendorf;

  • 作者单位

    Earth System Science Department, Stanford University, Stanford, California 94305, United States;

    Environmental Sciences Department, University of California - Riverside, Riverside, California 92521, United States;

    Department of Geosciences, Boise State University, Boise, Idaho 83725, United States;

    State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan, Hubei 430074, People's Republic of China;

    State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan, Hubei 430074, People's Republic of China;

    Earth System Science Department, Stanford University, Stanford, California 94305, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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