| Shewanella oneidensis MR-1对针铁矿的还原与汞的生物甲基化 |
| 摘要点击 1685 全文点击 1282 投稿时间：2014-11-03 修订日期：2015-01-06 |
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| 中文关键词 铁还原菌 针铁矿 异化还原 汞甲基化 腐殖酸 |
| 英文关键词 iron reducing bacteria goethite dissimilatory reduction mercury methylation humic acid |
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| 中文摘要 |
| 在实验室模拟条件下,研究了铁还原菌奥奈达希瓦氏菌 Shewanella oneidensis MR-1对针铁矿的异化还原及其对汞生物甲基化的影响. 结果表明, S. oneidensis MR-1能溶解针铁矿,并能将溶解出的Fe3+还原成Fe2+; S. oneidensis MR-1也是一种汞甲基化细菌,能够将无机汞转化成甲基汞. 铁的溶解还原作用随着初始针铁矿剂量的大幅增加而减弱,针铁矿的异化还原在一定程度内促进汞的生物甲基化. 弱酸性条件比中碱性和强酸条件有利于汞的甲基化; 腐殖酸在低浓度促进汞甲基化,浓度过高则会抑制汞的甲基化. |
| 英文摘要 |
| The effects of the biological dissolution and reduction of goethite on mercury methylation by Shewanella oneidensis MR-1 were studied under laboratory conditions. The results showed that S. oneidensis MR-1 could dissolve goethite, and subsequently dissolved Fe3+ which was reduced to Fe2+. S. oneidensis MR-1 was also a kind of mercury methylation bacterial, which had a potential to transform inorganic mercury to methylmercury. The biological dissolution and reduction of goethite declined with the increasing initial dosage of goethite. The dissimilatory reduction of goethite could promote mercury methylation to a certain extent. Weakly acidic condition was more beneficial to mercury methylation than neutral, alkaline or highly acidic conditions. Low humic acid concentration accelerated mercury methylation, while high humic acid concentration restrained mercury methylation. |
