Dechlorination of VC and cis-DCE by Reduced Iron Minerals Produced under Iron and Sulfate Reducing Conditions

本项目的目标是确定四氯乙烯（PCE）和三氯乙烯（TCE）脱氯途径中顺式二氯乙烯（cis-DCE）和氯乙烯（VC）两种中间体促进完全非生物还原脱氯的还原铁矿物和地球化学条件。在受污染的地下水中发现了这些比母体化合物毒性更大的化合物的积累，这（主要）是由于PCE和/或TCE的部分脱氯。该项目有三个目标：(1)在与环境相关的还原条件下制备还原铁矿物的反应性纳米颗粒；(2)研究这些铁矿物对VC和顺式dce的还原脱氯速率和机制；(3)评估pH和NOM对这些矿物对化合物的还原脱氯的影响。该方案解决了地下水修复中一个重要而尚未解决的问题；在美国，修复受PCE和TCE污染的地下水场地仍然是一个主要的环境问题，该项目将提高我们对促进这些有毒化合物完全脱氯的条件的理解。

CBET-0730064Kim HayesUniversity of MichiganDechlorination of VC and cis-DCE by Reduced Iron Minerals Produced under Iron and Sulfate Reducing Conditions The goal of this project is to identify reduced iron minerals and geochemical conditions that promote complete abiotic reductive dechlorination of two intermediates in the dechlorination pathways of tetrachloroethylene (PCE) and trichloroethylene (TCE): cis-dichloroethylene (cis-DCE) and vinyl chloride (VC). Build-up of these compounds, which are more toxic than the parent compounds, has been found in contaminated ground water due (mainly) to partial dechlorination of PCE and/or TCE. The project has three objectives: (1) produce reactive nano-particles of reduced iron minerals under environmentally relevant reducing conditions, (2) investigate the rates and mechanisms of VC and cis-DCE reductive dechlorination by these iron minerals, and (3) evaluate the effects of pH and NOM on reductive dechlorination of the compounds by these minerals. The proposal addresses an important and unresolved problem in ground-water remediation; remediation of ground-water sites contaminated by PCE and TCE is still a major environmental problem in the United States, and the project will improve our understanding of the conditions that promote complete dechlorination of these toxic compounds.