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首页> 外文期刊>Environmental Science & Technology >Formation of soluble organo-chromium(III) complexes after chromate reduction in the presence of cellular organics
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Formation of soluble organo-chromium(III) complexes after chromate reduction in the presence of cellular organics

机译：在细胞有机物存在下铬酸盐还原后形成可溶性有机铬（III）络合物

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Microbial reduction of hexavalent chromium [Cr(VI)] to trivalent chromium [Cr(I I I)] has been investigated as a method for bioremediation of Cr(VI) contaminated environments. The produced Cr(III) is thought to be insoluble Cr(OH)3; however, recent reports suggested a more complex fate of Cr(III). A bacterial enzyme system, using NADH as the reductant, converts Cr(VI)to a soluble NAD(+)-Cr(III) complex, and cytochrome c-mediated Cr(VI) reduction produces cytochrome c-Cr(III) adducts. In this study, Cr(VI) reduction in the presence of cellular organic metabolites formed both soluble and insoluble organo-Cr(III) end-products. Several soluble end-products were characterized by absorbance spectroscopy and electron paramagnetic resonance spectrometry as organo-Cr(III) complexes, similar to the known ascorbate-Cr(III) complex. The complexes remained soluble and stable upon dialysis against distilled H2O and over a broad pH range. The ready formation of stable organo-Cr(III) complexes suggests that organo-Cr(III) complexes are rather common, likely representing an integral part of the natural cycling of chromium. Thus, organo-Cr(III) complexes may account for the mobile form of Cr(III) detected in the environment.
机译：已经研究了将六价铬[Cr（VI）]还原为三价铬[Cr（II）]的方法，以作为生物修复Cr（VI）污染环境的方法。产生的Cr（III）被认为是不溶的Cr（OH）3；但是，最近的报告表明，Cr（III）的命运更为复杂。使用NADH作为还原剂的细菌酶系统将Cr（VI）转化为可溶性NAD（+）-Cr（III）络合物，并且细胞色素c介导的Cr（VI）还原产生细胞色素c-Cr（III）加合物。在这项研究中，Cr（VI）在细胞有机代谢物存在下的还原形成了可溶和不可溶的有机-Cr（III）终产物。几种可溶性终产物通过吸收光谱和电子顺磁共振光谱法表征为有机Cr（III）络合物，类似于已知的抗坏血酸盐-Cr（III）络合物。在针对蒸馏水和宽pH范围内进行透析后，复合物保持可溶且稳定。稳定的有机-Cr（III）配合物的现成形成表明有机-Cr（III）配合物相当普遍，可能代表了铬自然循环的组成部分。因此，有机-Cr（III）络合物可解释在环境中检测到的Cr（III）的移动形式。

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