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首页> 外文期刊>Environmental Science & Technology >Using ~(17)0 to Investigate Nitrate Sources and Sinks in a Semi-Arid Groundwater System
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Using ~(17)0 to Investigate Nitrate Sources and Sinks in a Semi-Arid Groundwater System

机译：使用〜（17）0研究半干旱地下水系统中的硝酸盐源和汇

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We apply a triple isotope approach for nitrate that utilizes △~(17)O as a conservative tracer, in combination with δ~(18)O and δ~(15)N, to assess source/ sink dynamics of groundwater nitrate beneath alluvial washes in a semiarid urban setting. Other studies have used δ~(18)O and δ~(15)N to determine nitrate sources and cycling, but the atmospheric δ~(18)O signature can be overprinted by biogeochemical processes. In this study, δ~(18)O and δ~(15)N values of nitrate were coupled with δ~(17)O values of nitrate to quantify atmospheric nitrate inputs and denitrification amounts. Results show generally low groundwater nitrate concentrations (<0.2 mmol/L) throughout the basin; high nitrate concentrations (up to 1 mmol/L) with evidence for some denitrification were detected in areas where effluent was the predominant source of recharge to groundwater. Furthermore, the denitrification was inferred from elevated δ~(18)O and δ~(15)N values which were reinforced by increases in observed δ~(17)O values. Finally, relatively low, but significant atmospheric nitrate concentrations were measured in groundwater (up to 6% of total nitrate). This study concludes that the triple isotope approach improves determination of the proportion of atmospheric nitrate and the significance of denitrification in natural waters, allowing us to develop a conceptual model of the biogeochemical processes controlling nitrogen in an urban setting.
机译：我们应用硝酸盐的三同位素方法，以△〜（17）O为保守示踪剂，结合δ〜（18）O和δ〜（15）N，评估冲积作用下地下水硝酸盐的源/汇动态。在半干旱的城市环境中。其他研究已经使用δ〜（18）O和δ〜（15）N来确定硝酸盐的来源和循环，但是大气δ〜（18）O的特征可以被生物地球化学过程覆盖。在这项研究中，硝酸盐的δ〜（18）O和δ〜（15）N值与硝酸盐的δ〜（17）O值耦合以量化大气中硝酸盐的输入量和反硝化量。结果表明，整个流域的地下水硝酸盐浓度普遍较低（<0.2 mmol / L）。在污水是主要补给地下水的地区，检测到高硝酸盐浓度（最高1 mmol / L），并有反硝化的迹象。此外，根据升高的δ〜（18）O和δ〜（15）N值可以推断出反硝化作用，而δ〜（17）O值的增加增强了δ〜（18）O和δ〜（15）N的值。最后，在地下水中测得的大气硝酸盐浓度相对较低，但相当高（最高占硝酸盐总量的6％）。这项研究得出的结论是，三重同位素方法改进了对自然硝酸盐含量和自然水中反硝化作用的确定，从而使我们能够开发城市环境中控制氮的生物地球化学过程的概念模型。

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  • 来源
    《Environmental Science & Technology》 |2012年第2期|p.745-751|共7页
  • 作者

    Navid Rene Dejwakh; Thomas Meixner; Greg Michalski; Jennifer Mclntosh;

  • 作者单位

    Department of Hydrology and Water Resources, University of Arizona, Tucson, Arizona, United States;

    Department of Hydrology and Water Resources, University of Arizona, Tucson, Arizona, United States;

    Department of Earth and Atmospheric Sciences, Purdue University, West Lafayette, Indiana, United States;

    Department of Hydrology and Water Resources, University of Arizona, Tucson, Arizona, 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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