Transformations of Tetrachloroethene and Trichloroethene in Microcosms and Groundwater
Transformations of Tetrachloroethene and Trichloroethene in Microcosms and Groundwater
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四氯乙烯和三氯乙烯在微观世界和地下水中的转化
DOI：
10.1002/j.1551-8833.1984.tb05282.x
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发表时间：
1984
影响因子：
--
通讯作者：
J. Demarco
中科院分区：
文献类型：
--
作者：
Frances Z. Parsons;P. Wood;J. Demarco
在一个被泄漏储罐中的三氯乙烯污染的地点的井水中发现了顺式和反式 1,2-二氯乙烯，尽管这两种化合物在附近都没有使用，也没有作为储罐中三氯乙烯的杂质存在。四氯乙烯和三氯乙烯在干洗和金属修补厂中的使用很普遍。在佛罗里达州南部地下水中发现的几种氯乙烯化合物可能是这些溶剂通过地下水环境中的微生物代谢形成的。在这项研究中，在含有来自含水层补给盆地的淤泥的微观世界中培养四氯乙烯后，观察到四氯乙烯的消耗以及顺式和反式1,2-二氯乙烯和氯乙烯的出现。佛罗里达州东南部戴德县和布劳沃德县的公共饮用水是从比斯坎含水层埋深不到 45 m（150 英尺）的井中抽取的，该含水层是由多孔钙质岩石组成的浅层无承压含水层。含水层主要由大沼泽地（禾本科湿地）的降雨补给。收集到的地表水与地下水连续，通过淤泥床进入岩石底层，淤泥床是由分解的本地植被形成的沙浆组织溶胶。从淤泥中浸出的有机溶质在地下水中的浓度高达 17 毫克/升。 60 ntu 的浊度值并不罕见。近五年来，氯醚
Cis- and trans-1,2-dichloroethene were found in well water at a site contaminated with trichloroethene from a leaking storage tank, although neither compound was used in the vicinity nor was present as an impurity in the trichloroethene in the storage tank The use of tetrachloroethene and trichloroethene in dry cleaning and metal refinishing plants is widespread. Several chloroethene compounds that are found in southern Florida groundwater may have been formed from these solvents via microbial metabolism in the groundwater environment. In this study, depletion of tetrachloroethene and appearance of cis- and trans-1,2-dichloroethene and chloroethene were observed following incubation of tetrachloroethene in microcosms containing muck from the aquifer recharge basin. Public drinking water in Dade and Broward counties in southeastern Florida is drawn from wells sunk less than 45 m (150 ft) deep into the Biscayne Aquifer, which is a shallow, unconfined aquifer composed of porous calcareous rock. The aquifer is recharged primarily by rain falling in the Everglades, a graminoid wetland. The collected surface water, which is continuous withgroundwater, enters the rock substratum through a bed of muck, a saprist histosol formed of decomposed indigenous vegetation.’ Organic solutes leached from the muck are present in groundwater at concentrations up to 17 mg/L. Turbidity values of 60 ntu are not uncommon. During the past five years, chloroeth