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首页> 外文期刊>Environmental Science & Technology >Rapid Reaction of Nanomolar Mn(ll) with Superoxide Radical in Seawater and Simulated Freshwater
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Rapid Reaction of Nanomolar Mn(ll) with Superoxide Radical in Seawater and Simulated Freshwater

机译：纳米摩尔Mn（ll）与超氧自由基在海水和模拟淡水中的快速反应

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摘要

Superoxide radical (O_2 ) has been proposed to be an important participant in oxidation-reduction reactions of metal ions in natural waters. Here, we studied the reaction of nanomolar Mn(ll) with O_2~ in seawater and simulated freshwater, using chemilumines-cence detection of O_2 to quantify the effect of Mn(ll) on the decay kinetics of O_2~. "With 3-24 nM added [Mn(II)] and<0.7nM [O_2~], we observed effective second-order rate constants for the reaction of Mn(li)withO_2~of6 X 106tol x lO7!^"1^"1 in various seawater samples. In simulated freshwater (pH 8.6), the effective rate constant of Mn(ll) reaction with O_2~ was somewhat lower, 1.6 x 106 M1 • s1. With higher initial [O_2~], in excess of added [Mn(ll)], catalytic decay of O_2 by Mn was observed, implying that a Mn(lI/IIl) redox cycle occurred. Our results show that reactions with nanomolar Mn(Il) could be an important sink of O_2 in natural waters. In addition, reaction of Mn(Il) with superoxide could maintain a significant fraction of dissolved Mn in the +III oxidation state.
机译：已经提出超氧自由基（O_2）是天然水中金属离子的氧化还原反应的重要参与者。在这里，我们使用化学发光法检测O_2定量分析了Mn（ll）对O_2〜衰减动力学的影响，研究了海水和模拟淡水中纳摩尔浓度的Mn（II）与O_2〜的反应。 “在添加3-24 nM [Mn（II）]和<0.7nM [O_2〜]的情况下，我们观察到Mn（li）与O_2〜of6×106tol xlO7！^^反应的有效二阶速率常数！”“ 1 ^ “在各种海水样品中为1。在模拟淡水（pH 8.6）中，Mn（ll）与O_2〜反应的有效速率常数稍低，为1.6 x 106 M1•s1。初始[O_2〜]较高，超过了添加[Mn（II）]后，观察到O_2被Mn催化分解，这表明发生了Mn（II / IIl）氧化还原循环，我们的结果表明，与纳摩尔型Mn（II）的反应可能是自然界中O_2的重要汇。另外，Mn（II）与超氧化物的反应可以将很大一部分溶解的Mn保持在+ III氧化态。

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  • 来源
    《Environmental Science & Technology》 |2011年第7期|p.2811-2817|共7页
  • 作者

    S. Paul Hansard; Hillary D. Easter; Bettina M. Voelker;

  • 作者单位

    Department of Chemistry and Geochemistry, Colorado School of Mines, Golden, Colorado 80401, United States;

    Department of Chemistry and Geochemistry, Colorado School of Mines, Golden, Colorado 80401, United States;

    Department of Chemistry and Geochemistry, Colorado School of Mines, Golden, Colorado 80401, 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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  • 正文语种 eng
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