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首页> 外文期刊>Environmental Science & Technology >Long-Term Temporal Variability in Hydrogen Peroxide Concentrations in Wilmington, North Carolina USA Rainwater
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Long-Term Temporal Variability in Hydrogen Peroxide Concentrations in Wilmington, North Carolina USA Rainwater

机译：美国北卡罗来纳州威明顿市过氧化氢浓度的长期时间变化

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摘要

Measurements of hydrogen peroxide (H_2O_2), pH, dissolved organic carbon (DOC), and inorganic anions (chloride, nitrate, and sulfate) in rainwater were conducted on an event basis at a single site in Wilmington, NC for the past decade in a study that included over 600 individual rain events. Annual volume weighted average (VWA) H_2O_2 concentrations were negatively correlated (p < 0.001) with annual VWA nonseasalt sulfate (NSS) concentrations in low pH (<5) rainwater. Under these conditions H_2O_2 is the primary aqueous-phase oridant of SO_2 in the atmosphere. We attribute the increase of H_2O_2 to decreasing SO_2 emissions which has had the effect of reducing a major tropospheric sink for H_2O_2. Annual VWA H_2O_2 concentrations in low pH (<5) rains showed a significant increase over the time scale of this study, which represents the only long-term continuous data set of H_2O_2 concentrations in wet deposition at a single location. This compositional change has important implications because H_2O_2 is a source of highly reactive free radicals so its increase reflects a higher overall oxidation capacity of atmospheric waters. Also, because rainwater is an important mechanism by which H_2O_2 is transported from the atmosphere to surface waters, greater wet deposition of H_2O_2 could influence the redox chemistry of receiving watersheds which typically have concentrations 2—3 orders of magnitude lower than rainwater.
机译：在过去的十年中，在北卡罗来纳州威尔明顿的一个地点进行了事件基础上的雨水中过氧化氢（H_2O_2），pH，溶解有机碳（DOC）和无机阴离子（氯离子，硝酸根和硫酸根）的测量。研究包括600多次个人降雨事件。在低pH（<5）雨水中，年体积加权平均（VWA）H_2O_2浓度与年VWA非硫酸盐（NSS）浓度呈负相关（p <0.001）。在这些条件下，H_2O_2是大气中SO_2的主要水相氧化剂。我们将H_2O_2的增加归因于SO_2排放的减少，这具有减少H_2O_2的主要对流层汇的作用。在本研究的时间范围内，低pH（<5）雨中的VWA H_2O_2年度浓度显示出显着增加，这代表了单个位置湿沉降中H_2O_2浓度的唯一长期连续数据集。这种组成变化具有重要意义，因为H_2O_2是高反应性自由基的来源，因此其增加反映了大气中较高的总氧化能力。另外，由于雨水是将H_2O_2从大气传输到地表水的重要机制，因此H_2O_2的较大湿沉降会影响接收流域的氧化还原化学，该流域的浓度通常比雨水低2-3个数量级。

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  • 来源
    《Environmental Science & Technology》 |2011年第22期|p.9538-9542|共5页
  • 作者

    Katherine M. Mullaugh; Robert J. Kieber; Joan D. Willey; G. Brooks Avery Jr;

  • 作者单位

    Department of Chemistry and Biochemistry, University of North Carolina Wilmington, Wilmington, North Carolina 28403-5932, United States;

    Department of Chemistry and Biochemistry, University of North Carolina Wilmington, Wilmington, North Carolina 28403-5932, United States;

    Department of Chemistry and Biochemistry, University of North Carolina Wilmington, Wilmington, North Carolina 28403-5932, United States;

    Department of Chemistry and Biochemistry, University of North Carolina Wilmington, Wilmington, North Carolina 28403-5932, 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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