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Shewanella oneidensis MR-1异化还原Fe(III)介导的As(III)氧化转化
引用本文:汪明霞,王娟,司友斌.Shewanella oneidensis MR-1异化还原Fe(III)介导的As(III)氧化转化[J].中国环境科学,2014,34(9):2368-2373.
作者姓名:汪明霞  王娟  司友斌
作者单位:安徽农业大学资源与环境学院,安徽 合肥,230036
基金项目:国家自然科学基金项目,公益性行业(农业)科研专项经费课题
摘    要:在实验室模拟条件下,研究了Shewanella oneidensis MR-1作用下Fe(III)还原和As(III)氧化动力学及其影响因素.结果表明,Fe(III)被还原为Fe(II)的同时伴随着As(III)氧化为As(V);S. oneidensis MR-1 在含低浓度As(III)培养基上生长良好,在高浓度培养基上生长被抑制;As(III)通过制约菌体的生长与活性来抑制Fe(III)异化还原.同样,适量浓度的Fe(III)含量对As(III)氧化转化有很强的促进作用,但是过高浓度的Fe(III)浓度使得溶液中产生过多的Fe(II),从而对As(III)氧化转化有一定程度的抑制作用.此外,弱碱环境更有利于As(III)氧化转化.

关 键 词:铁异化还原  氢氧化铁  As(III  V)  氧化还原  

As(III) oxidization coupled to Fe(III) reduction by Shewanella oneidensis MR-1
WANG Ming-xia,WANG Juan,SI You-bin.As(III) oxidization coupled to Fe(III) reduction by Shewanella oneidensis MR-1[J].China Environmental Science,2014,34(9):2368-2373.
Authors:WANG Ming-xia  WANG Juan  SI You-bin
Abstract:The kinetics of Fe (III) reduction and As (III) oxidation by Shewanella oneidensis MR-1 and influenced factors were studied under laboratory conditions. Results showed that the oxidization of As (III) to As (V) occurred in accompanying with Fe (III) reduction, S. oneidensis MR-1 could grow well at low concentration of As (III), but its growth was suppressed at high concentration of As (III). As (III) inhibited dissimilatory iron reduction by affecting the growth and activity of S. oneidensis MR-1. Moreover, moderate Fe (III) could strongly promote As (III) oxidization, while high Fe (III) concentration might inhibit As (III) oxidization because of excess Fe (II). In addition, weak alkaline environment was more conducive to As (III) oxidization.
Keywords:dissimilatory iron reduction  Fe(OH)3  As(III  V)  redox
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