Sequential dehalogenation of chlorinated ethenes.
Sequential dehalogenation of chlorinated ethenes.
复制标题
氯化乙烯的连续脱卤。
DOI：
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发表时间：
1986
影响因子：
11.4
通讯作者：
P. Lorenzo
中科院分区：
文献类型：
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作者：
Gladys A. Barrio;Frances Z. Parsons;R. Nassar;P. Lorenzo
在模拟地下水环境的微观世界中，四氯乙烯和三氯乙烯还原脱卤生成顺式和反式1，2-二氯乙烯的过程已经得到证实。在这项研究中，含有有机沉积物和水的缺氧微宇宙被加标含有5 mg/L的以下化合物之一：1，1-二氯乙烯（1，1-DCE），顺式-1，2-二氯乙烯（CIS），或反式-1，2-二氯乙烯（TRANS）。在25/sup 0/ C下避光孵育长达6个月后，通过气相色谱法分析内容物，并通过气相色谱/质谱法进行验证，以确定转化过程中的顺序步骤。在所有加标微宇宙中孵育1-2周后产生氯乙烯（VC），但在无菌和未加标对照中未观察到。氯乙烷（CE）只产生在微观加标CIS，表明异构体的特异性和发生的机制，而不是还原脱氯。计算了1，1-DCE、CIS和TRANS的微生物脱卤动力学参数。参考文献11篇，图5幅，表1张。
Reductive dehalogenation of tetra- and trichloroethene to cis- and trans-1,2-dichloroethene in microcosms simulating groundwater environment has previously been demonstrated. In this study, anoxic microcosms containing organic sediment and water were spiked to contain 5 mg/L of one of the following compounds: 1,1-dichloroethene (1,1-DCE), cis-1,2-dichloroethene (CIS), or trans-1,2-dichloroethene (TRANS). After incubation in the dark at 25/sup 0/ C for up to 6 months, contents were analyzed by gas chromatography and verified by gas chromatography/mass spectrometry in an attempt to identify sequential steps in the transformation process. Vinyl chloride (VC) was produced after 1-2 weeks of incubation in all spiked microcosms, but none was observed in sterile and unspiked controls. Chloroethane (CE) was produced only in microcosms spiked with CIS, indicating isomer specificity and the occurrence of mechanisms other than reductive dechlorination. Kinetic parameters associated with the microbial dehalogenation of 1,1-DCE, CIS, and TRANS were calculated. 11 references, 5 figures, 1 table.