异化型铁还原菌及氧化铁体系中增强的滴滴涕还原脱氯。
Enhanced reductive dechlorination of DDT in an anaerobic system of dissimilatory iron-reducing bacteria and iron oxide.
机构信息
Guangdong Key Laboratory of Agricultural Environment Pollution Integrated Control, Guangdong Institute of Eco-Environmental and Soil Sciences, Guangzhou 510650, China.
出版信息
Environ Pollut. 2010 May;158(5):1733-40. doi: 10.1016/j.envpol.2009.11.020. Epub 2009 Dec 23.
The transformation of DDT was studied in an anaerobic system of dissimilatory iron-reducing bacteria (Shewanella decolorationis S12) and iron oxide (alpha-FeOOH). The results showed that S. decolorationis could reduce DDT into DDD, and DDT transformation rate was accelerated by the presence of alpha-FeOOH. DDD was observed as the primary transformation product, which was demonstrated to be transformed in the abiotic system of Fe(2+)+alpha-FeOOH and the system of DIRB+alpha-FeOOH. The intermediates of DDMS and DBP were detected after 9 months, likely suggesting that reductive dechlorination was the main dechlorination pathway of DDT in the iron-reducing system. The enhanced reductive dechlorination of DDT was mainly due to biogenic Fe(II) sorbed on the surface of alpha-FeOOH, which can serve as a mediator for the transformation of DDT. This study demonstrated the important role of DIRB and iron oxide on DDT and DDD transformation under anaerobic iron-reducing environments.
在异化铁还原菌（Shewanella decolorationis S12）和氧化铁（α-FeOOH）的厌氧体系中研究了滴滴涕的转化。结果表明，S. decolorationis 可以将滴滴涕还原为滴滴滴，并且α-FeOOH 的存在加速了滴滴涕的转化。观察到滴滴滴是主要的转化产物，它在非生物体系 Fe(2+)+α-FeOOH 和 DIRB+α-FeOOH 体系中被转化。9 个月后检测到 DDMS 和 DBP 的中间产物，这可能表明在铁还原体系中，还原脱氯是滴滴涕的主要脱氯途径。滴滴涕的还原脱氯增强主要是由于生物成因的 Fe(II) 吸附在α-FeOOH 的表面上，它可以作为 DDT 转化的媒介。本研究证明了 DIRB 和氧化铁在厌氧铁还原环境下对滴滴涕和滴滴滴转化的重要作用。
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