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首页> 美国卫生研究院文献>Applied and Environmental Microbiology >Effect of Incubation Temperature on the Route of Microbial Reductive Dechlorination of 2346-Tetrachlorobiphenyl in Polychlorinated Biphenyl (PCB)-Contaminated and PCB-Free Freshwater Sediments
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Effect of Incubation Temperature on the Route of Microbial Reductive Dechlorination of 2346-Tetrachlorobiphenyl in Polychlorinated Biphenyl (PCB)-Contaminated and PCB-Free Freshwater Sediments

机译：孵育温度对多氯联苯污染和不含PCB的淡水沉积物中2346-四氯联苯微生物还原脱氯途径的影响

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We studied the influence of temperature (4 to 66(deg)C) on the microbial dechlorination of 2,3,4,6-tetrachlorobiphenyl (2,3,4,6-CB) incubated for 1 year in anaerobic sediments from Woods Pond in Lenox, Mass., and Sandy Creek Nature Center Pond (SCNC) in Athens, Ga. Seven discrete dechlorination reactions were observed, four of which occurred in both sediments. These were 2,3,4,6-CB (symbl) 2,4,6-CB, 2,3,4,6-CB (symbl) 2,3,6-CB, 2,4,6-CB (symbl) 2,6-CB, and 2,3,6-CB (symbl) 2,6-CB. Three additional reactions occurred only in Woods Pond sediment. These were 2,4,6-CB (symbl) 2,4-CB, 2,4-CB (symbl) 2-CB, and 2,4-CB (symbl) 4-CB. The dechlorination reactions exhibited at least four different temperature dependencies in SCNC sediment and at least six in Woods Pond sediment. We attribute the discrete dechlorination reactions to different polychlorinated biphenyl (PCB)-dechlorinating microorganisms with distinct specificities. Temperature influenced the timing and the relative predominance of parallel pathways of dechlorination, i.e., meta versus para dechlorination of 2,3,4,6-CB and ortho versus para dechlorination of 2,4,6-CB and 2,4-CB. meta dechlorination of 2,3,4,6-CB to 2,4,6-CB dominated at all tested temperatures except at 18 and 34(deg)C, where para dechlorination to 2,3,6-CB dominated in some replicates. The dechlorination of 2,4,6-CB was restricted to (symbl)15 to 30(deg)C in both sediments. Temperature affected the lag time preceding the dechlorination of 2,4,6-CB in both sediments and affected the preferred route of its dechlorination in Woods Pond sediment. para dechlorination dominated at 20(deg)C, and ortho dechlorination dominated at 15(deg)C, but at 18 and 22 to 30(deg)C the relative dominance of ortho versus para dechlorination of 2,4,6-CB varied. These data indicate that field temperatures play a significant role in controlling the nature and the extent of the PCB dechlorination that occurs at a given site.
机译：我们研究了温度（4至66°C）对在Woods Pond厌氧沉积物中培养1年的2,3,4,6-四氯联苯（2,3,4,6-CB）微生物脱氯的影响位于马萨诸塞州莱诺克斯和乔治亚州雅典的桑迪克里克自然中心池塘（SCNC）。观察到七个离散的脱氯反应，其中四个发生在两个沉积物中。这些是2,3,4,6-CB（symbl）2,4,6-CB，2,3,4,6-CB（symbl）2,3,6-CB，2,4,6-CB（ symbl）2,6-CB和2,3,6-CB（symbl）2,6-CB。仅在伍兹池塘的沉积物中发生了另外三个反应。它们是2,4,6-CB（符号）2,4-CB，2,4-CB（符号）2-CB和2,4-CB（符号）4-CB。脱氯反应在SCNC沉积物中表现出至少四个不同的温度依赖性，在Woods Pond沉积物中表现出至少六个温度依赖性。我们将离散的脱氯反应归因于具有不同特异性的不同多氯联苯（PCB）-脱氯微生物。温度影响脱氯平行途径的时间和相对优势，即2,3,4,6-CB的间氯与对脱氯以及2,4,6-CB和2,4-CB的对氯与对脱氯。在所有测试温度下，除18和34°C以外，从2,3,4,6-CB到2,4,6-CB的间位脱氯占主导地位，其中在某些重复实验中，对位脱氯到2,3,6-CB占主导地位。在两种沉积物中，2,4,6-CB的脱氯作用均限制在（symbl）15至30℃。温度影响两种沉积物中2,4,6-CB脱氯之前的滞后时间，并影响伍兹池塘沉积物中其脱氯的首选途径。对位脱氯在20℃下占主导地位，而邻位脱氯在15℃下占主导地位，但是在18和22至30℃下，2,4,6-CB的邻位与对位脱氯的相对优势不同。这些数据表明，现场温度在控制特定位置发生的PCB脱氯的性质和程度方面起着重要作用。

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