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首页> 外文期刊>Environmental Science & Technology >Production of Hydrogen Peroxide in Groundwater at Rifle, Colorado
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Production of Hydrogen Peroxide in Groundwater at Rifle, Colorado

机译：科罗拉多州来福枪在地下水中生产过氧化氢

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摘要

The commonly held assumption that photodependent processes dominate H_2O_2 production in natural waters has been recently questioned. Here, we present evidence for the unrecognized and light-independent generation of H_2O_2 in groundwater of an alluvial aquifer adjacent to the Colorado River near Rifle, CO. In situ detection using a sensitive chemiluminescent method suggests H_2O_2 concentrations ranging from lower than the detection limit (<1 nM) to 54 nM along the vertical profiles obtained at various locations across the aquifer. Our results also suggest dark formation of H_2O_2 is more likely to occur in transitional redox environments where reduced elements (e.g., reduced metals and NOM) meet oxygen, such as oxic-anoxic interfaces. A simplified kinetic model involving interactions among iron, reduced NOM, and oxygen was able to reproduce roughly many, but not all, of the features in our detected H_2O_2 profiles, and therefore there are other minor biological and/or chemical controls on H_2O_2 steady-state concentrations in such aquifer. Because of its transient nature, the widespread presence of H_2O_2 in groundwater suggests the existence of a balance between H_2O_2 sources and sinks, which potentially involves a cascade of various biogeochemically important processes that could have significant impacts on metalutrient cycling in groundwater-dependent ecosystems, such as wetlands and springs. More importantly, our results demonstrate that reactive oxygen species are not only widespread in oceanic and atmospheric systems but also in the subsurface domain, possibly the least understood component of biogeochemical cycles.
机译：最近有人质疑光依赖性过程在天然水中占主导地位的H_2O_2产生的普遍假设。在这里，我们提供了佐治亚州Rifle附近科罗拉多河附近冲积层地下水中H_2O_2的未被识别和不依赖光的生成的证据。使用敏感化学发光方法进行的原位检测表明H_2O_2的浓度范围低于检测限（沿着在含水层各个位置获得的垂直剖面小于1 nM至54 nM。我们的结果还表明，在过渡的氧化还原环境中，还原的元素（例如，还原的金属和NOM）与氧（例如氧-氧-氧界面）接触时，更可能发生深色的H_2O_2形成。简化的动力学模型涉及铁，还原型NOM和氧气之间的相互作用，能够重现我们检测到的H_2O_2谱中的许多（但不是全部）特征，因此，H_2O_2稳定存在其他次要的生物和/或化学控制，状态在这样的含水层中的浓度。由于其短暂的性质，H_2O_2在地下水中的广泛存在表明H_2O_2源和汇之间存在平衡，这可能涉及一系列生物地球化学重要过程，这些过程可能对依赖地下水的生态系统中的金属/养分循环产生重大影响，例如湿地和​​泉水。更重要的是，我们的结果表明，活性氧不仅分布在海洋和大气系统中，而且还分布在地下区域，这可能是生物地球化学循环中鲜为人知的组成部分。

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  • 来源
    《Environmental Science & Technology》 |2017年第14期|7881-7891|共11页
  • 作者

    Yuan Xiu; Nico Peter S.; Huang Xiang; Liu Tongxu; Ulrich Craig; Williams Kenneth H.; Davis James A.;

  • 作者单位

    Earth and Environmental Sciences, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA, United States;

    Earth and Environmental Sciences, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA, United States;

    Institute of Water Sciences, College of Engineering, Peking University, 5 Yiheyuan Road, Haidian, Beijing, China;

    School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW, Australia;

    Earth and Environmental Sciences, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA, United States;

    Earth and Environmental Sciences, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA, United States;

    Earth and Environmental Sciences, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA, 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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