DECHLORINATION OF 4 COMMERCIAL POLYCHLORINATED BIPHENYL MIXTURES (AROCLORS) BY ANAEROBIC MICROORGANISMS FROM SEDIMENTS
DECHLORINATION OF 4 COMMERCIAL POLYCHLORINATED BIPHENYL MIXTURES (AROCLORS) BY ANAEROBIC MICROORGANISMS FROM SEDIMENTS
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DOI：
10.1128/aem.56.8.2360-2369.1990
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发表时间：
1990-08-01
影响因子：
4.4
通讯作者：
TIEDJE, JM
中科院分区：
文献类型：
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作者：
QUENSEN, JF;BOYD, SA;TIEDJE, JM
比较了从两种多氯联苯（PCB）污染的沉积物中制备的接种物对4种多氯联苯的脱氯速率、脱氯程度和脱氯模式。使用的四种混合物，Aroclors 1242、1248、1254和1260，平均每个联苯分子分别含有大约三个、四个、五个和六个氯。所有四种Aroclors都被脱氯，metaplusparachlorines的损失范围为15%至85%。来自哈德逊河上游Aroclor 1242污染场地的微生物对Aroclor 1242的脱氯程度大于来自马萨诸塞州银Aroclor 1260污染沉积物的微生物。银接种物比哈德逊河接种物更快地脱氯Aroclor 1260，并表现出优先去除间氯。对于每种接种物，脱氯的速率和程度往往会随着多氯联苯氯化程度的增加而降低，尤其是多氯联苯1260。对于Aroclors 1242、1248和1254，观察到的最大脱氯率分别为每周每克沉积物去除0.3、0.3和0.2微克氯原子。多氯联苯1260对哈德逊河和银生物的最大脱氯速率分别为每克沉积物每周去除0.04和0.21微克氯原子。脱氯模式表明，哈德逊河微生物比银生物更有能力去除最后的副氯。这些结果表明，有不同的PCB-脱氯微生物在不同的网站，具有特征的PCB脱氯的特异性。
The rate, extent, and pattern of dechlorination of four Aroclors by inocula prepared from two polychlorinated biphenyl (PCB)-contaminated sediments were compared. The four mixtures used, Aroclors 1242, 1248, 1254, and 1260, average approximately three, four, five, and six chlorines, respectively, per biphenyl molecule. All four Aroclors were dechlorinated with the loss ofmetaplusparachlorines ranging from 15 to 85%. Microorganisms from an Aroclor 1242-contaminated site in the upper Hudson River dechlorinated Aroclor 1242 to a greater extent than did microorganisms from Aroclor 1260-contaminated sediments from Silver Lake, Mass. The Silver Lake inoculum dechlorinated Aroclor 1260 more rapidly than the Hudson River inoculum did and showed a preferential removal ofmetachlorines. For each inoculum the rate and extent of dechlorination tended to decrease as the degree of chlorination of the Aroclor increased, especially for Aroclor 1260. The maximal observed dechlorination rates were 0.3, 0.3, and 0.2 μg-atoms of Cl removed per g of sediment per week for Aroclors 1242, 1248, and 1254, respectively. The maximal observed dechlorination rates for Hudson River and Silver Lake organisms for Aroclor 1260 were 0.04 and 0.21 μg-atoms of Cl removed per g of sediment per week, respectively. The dechlorination patterns obtained suggested that the Hudson River microorganisms were more capable than the Silver Lake organisms of removing the lastparachlorine. These results suggest that there are different PCB-dechlorinating microorganisms at different sites, with characteristic specificities for PCB dechlorination.