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首页> 外文期刊>Environmental Science & Technology >Interference of Nitrite with Pyrite under Acidic Conditions: Implications for Studies of Chemolithotrophic Denitrification
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Interference of Nitrite with Pyrite under Acidic Conditions: Implications for Studies of Chemolithotrophic Denitrification

机译：酸性条件下亚硝酸盐对黄铁矿的干扰：对化石营养反硝化研究的意义

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摘要

Chemolithotrophic denitrification coupled to pyrite oxidation is regarded a key process in the removal of nitrate in aquifers. A common product is nitrite, which is a strong oxidant under acidic conditions. Nitrite may thus interfere with Fe(Ⅱ) during acidic extraction, a procedure typically used to quantify microbial pyrite oxidation, in overestimating Fe(Ⅲ) production. We studied the reaction between pyrite (5-125 mM) and nitrite (40-2000 μM) at pH 0, 5.5, and 6.8 in the absence and presence of oxygen. Significant oxidation of pyrite was measured at pH 0 with a yield of 100 μM Fe(m) after 5 mM pyrite was incubated with 2000 μM nitrite for 24 h. Dissolved oxygen increased the rate at pH 0. No oxidation of pyrite was observed at pH 5.5 and 6.8. Our data imply a cyclic model for pyrite oxidation by Fe(Ⅲ) on the basis of the oxidation of residual Fe(Ⅱ) by NO and NO_2. Interference by nitrite could be avoided if nitrite was removed from the pyrite suspensions through a washing procedure prior to. acidic extraction. We conclude that such interferences should be considered in studies on microbially mediated pyrite oxidation with nitrate.
机译：化学富营养性反硝化与黄铁矿氧化耦合被认为是去除含水层中硝酸盐的关键过程。常见的产品是亚硝酸盐，它在酸性条件下是强氧化剂。因此，亚硝酸盐可能会在酸性提取过程中干扰Fe（Ⅱ），而酸性提取是高估Fe（Ⅲ）产量时通常用于量化微生物黄铁矿氧化的一种方法。我们研究了在有氧和无氧条件下，黄铁矿（5-125 mM）和亚硝酸盐（40-2000μM）在pH 0、5.5和6.8之间的反应。在5 mM黄铁矿与2000μM亚硝酸盐孵育24小时后，在pH 0处测量到黄铁矿的显着氧化，收率为100μMFe（m）。在pH 0时，溶解氧增加了氧化速率。在pH 5.5和6.8时未观察到黄铁矿的氧化。我们的数据暗示了在残留的Fe（Ⅱ）被NO和NO_2氧化的基础上，黄铁矿被Fe（Ⅲ）氧化的循环模型。如果先通过洗涤程序从黄铁矿悬浮液中除去亚硝酸盐，则可以避免亚硝酸盐的干扰。酸性萃取。我们得出结论，在微生物介导的硫铁矿与硝酸盐氧化的研究中应考虑此类干扰。

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  • 来源
    《Environmental Science & Technology》 |2015年第19期|11403-11410|共8页
  • 作者

    Ruiwen Yan; Andreas Kappler; Stefan Peiffer;

  • 作者单位

    Department of Hydrology, University of Bayreuth, 95440 Bayreuth, Germany;

    Geomicrobiology Group, Eberhard-Karls-University Tuebingen, 72076 Tuebingen, Germany;

    Department of Hydrology, University of Bayreuth, 95440 Bayreuth, Germany;

  • 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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