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首页> 外文期刊>Geomicrobiology journal >Chromium(III) oxidation coupled with microbially mediated Mn(II) oxidation
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Chromium(III) oxidation coupled with microbially mediated Mn(II) oxidation

机译：铬（III）氧化与微生物介导的锰（II）氧化

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摘要

Reductive immobilization of Cr(VI) has been widely explored as a cost-effective approach for Cr-contaminated site remediation. In soils containing manganese oxides, however, the immobilized form of chromium, i.e., Cr(III), could potentially be reoxidized. In this study, batch experiments were conducted to assess whether there were any microbial processes that could accelerate Cr(III) oxidation in aerobic, manganese-containing systems. The results showed that in the presence of at least one species of manganese oxidizers, Pseudomonas putida, Cr(III) oxidation took place at low concentrations of Cr(III). About 30-50% of added Cr(III) (10 200 μ M) was oxidized to Cr(VI) within five days in the systems with P. putida and biogenic Mn oxides. The rate of Cr(III) oxidation was approximately proportional to the initial concentration of Cr(III) up to 100 μ M, but the growth of P. putida was partially inhibited by Cr(III) at 200 μ M and totally stopped when it reached 500 μ M. Cr(III) oxidation was dependent upon the biogenic formation of Mn oxides, though the oxidation rate was not directly proportional to the amount of Mn oxides formed. Chromium(III) oxidation took place through a catalytic pathway, in which the microbes mediated Mn(II) oxidation to form Mn-oxides, and Cr(III) was subsequently oxidized by the biogenic Mn-oxides.
机译：Cr（VI）的还原固定化已被广泛研究为一种经济有效的铬污染部位修复方法。然而，在含锰氧化物的土壤中，固定形式的铬即Cr（III）可能会被重新氧化。在这项研究中，进行了批量实验，以评估在有氧，含锰系统中是否存在任何微生物过程可以加速Cr（III）的氧化。结果表明，在至少一种锰氧化剂，恶臭假单胞菌的存在下，Cr（III）的氧化在低浓度的Cr（III）下发生。在具有恶臭假单胞菌和生物锰氧化物的系统中，约30-50％的添加的Cr（III）（10 200μM）在五天内被氧化为Cr（VI）。 Cr（III）的氧化速率与高达100μM的Cr（III）的初始浓度大致成正比，但是恶臭假单胞菌（P. putida）的生长在200μM时受到Cr（III）的部分抑制，并在其停止生长时完全停止。 Cr（III）的氧化程度取决于Mn氧化物的生物形成，尽管氧化速率与所形成的Mn氧化物的数量不成正比。铬（III）的氧化通过催化途径发生，其中微生物介导的锰（II）氧化形成锰氧化物，随后生物型锰氧化物将铬（III）氧化。

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