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首页> 外文期刊>Environmental Science & Technology >Natural Abiotic Formation of Oxalic Acid in Soils: Results from Aromatic Model Compounds and Soil Samples
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Natural Abiotic Formation of Oxalic Acid in Soils: Results from Aromatic Model Compounds and Soil Samples

机译：草酸在土壤中的天然非生物形成：芳香模型化合物和土壤样品的结果

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Oxalic acid is the smallest dicarboxylic acid and plays an important role in soil processes (e.g., mineral weathering and metal detoxification in plants). We have first proven its abiotic formation in soils and investigated natural abiotic degradation processes based on the oxidation of soil organic matter, enhanced by Fe~(3+) and H_2O_2 as hydroxyl radical suppliers. Experiments with the model compound catechol and further hydroxylated benzenes were performed to examine a common degradation pathway and to presume a general formation mechanism of oxalic acid. Two soil samples were tested for the release of oxalic acid and the potential effects of various soil parameters on oxalic acid formation. Additionally, the soil samples were treated with different soil sterilization methods to prove the oxalic acid formation under abiotic soil conditions. Different series of model experiments were conducted to determine a range of factors including Fe~(3+), H_2O_2, reaction time, pH, and chloride concentration on oxalic acid formation. Under certain conditions, catechol is degraded up to 65.6% to oxalic acid referring to carbon. In serial experiments with two soil samples, oxalic acid was produced, and the obtained results are suggestive of an abiotic degradation process. In conclusion, Fenton-like conditions with low Fe~(3+) concentrations and an excess of H_2O_2 as well as acidic conditions were required for an optimal oxalic acid formation. The presence of chloride reduced oxalic acid formation.
机译：草酸是最小的二羧酸，在土壤过程（例如矿物风化和植物中的金属排毒）中起着重要作用。我们首先证明了其在土壤中的非生物形成，并研究了以土壤有机物的氧化为基础的自然非生物降解过程，该过程由Fe〜（3+）和H_2O_2作为羟基自由基的供应者而增强。进行了模型化合物邻苯二酚和其他羟基苯的实验，以检验常见的降解途径并推测草酸的一般形成机理。测试了两个土壤样品中草酸的释放以及各种土壤参数对草酸形成的潜在影响。另外，用不同的土壤灭菌方法处理土壤样品以证明在非生物土壤条件下草酸的形成。进行了不同系列的模型实验，以确定一系列因素，包括Fe〜（3 +），H_2O_2，反应时间，pH和草酸形成时的氯化物浓度。在某些条件下，相对于碳，儿茶酚最多可降解为草酸的65.6％。在两个土壤样品的系列实验中，产生了草酸，所得结果表明是非生物降解过程。综上所述，为获得最佳的草酸生成效果，需要具有低Fe〜（3+）浓度和过量H_2O_2的Fenton样条件以及酸性条件。氯化物的存在减少了草酸的形成。

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  • 来源
    《Environmental Science & Technology》 |2013年第3期|1323-1329|共7页
  • 作者

    Sabine Studenroth; Stefan G. Huber; Karsten Kotte; Heinz F. Schoeler;

  • 作者单位

    Institute of Earth Sciences, University of Heidelberg, Im Neuenheimer Feld 234-236, 69120 Heidelberg, Germany;

    Institute of Earth Sciences, University of Heidelberg, Im Neuenheimer Feld 234-236, 69120 Heidelberg, Germany;

    Institute of Earth Sciences, University of Heidelberg, Im Neuenheimer Feld 234-236, 69120 Heidelberg, Germany;

    Institute of Earth Sciences, University of Heidelberg, Im Neuenheimer Feld 234-236, 69120 Heidelberg, 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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