Residual petroleum in sediments reduces the bioavailability and rate of reductive dechlorination of Aroclor 1242
Residual petroleum in sediments reduces the bioavailability and rate of reductive dechlorination of Aroclor 1242
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沉积物中的残留石油会降低 Aroclor 1242 的生物利用度和还原脱氯率
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
S. Boyd
中科院分区：
文献类型：
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作者：
M. Zwiernik;J. Quensen;S. Boyd
残留的石油碳氢化合物和多氯联苯（PCB）经常在污染地点同时被发现。在这些网站的多氯联苯的内在还原脱氯是高度可变的。银湖（MA）的沉积物中含有约6.2%的石油烃，在实验室测定中不支持PCB脱氯。从银湖沉积物中去除石油成分的溶剂萃取并没有改变他们无法支持脱氯。在已知支持多氯联苯脱氯的其他沉积物中接种多氯联苯脱氯生物，并逐步增加纯石油烃（0−4重量%/重量）或从银湖沉积物中提取的6.2%石油烃，多氯联苯脱氯的速度和程度都有所降低。在这些试验中观察到的最大脱氯率似乎完全取决于水相PCB浓度。最大脱氯速率与PCB浓度的一元回归方程。
Residual petroleum hydrocarbons and polychlorinated biphenyls (PCBs) are frequently found together at contamination sites. Intrinsic reductive dechlorination of PCBs at these sites is highly variable. Sediments of Silver Lake (MA), which contain ∼6.2% petroleum hydrocarbons, did not support PCB dechlorination in laboratory assays. Removal of petroleum components from Silver Lake sediments by solvent extraction did not alter their inability to support dechlorination. When other sediments known to support PCB dechlorination were inoculated with PCB-dechlorinating organisms and amended with incremental increases of pure petroleum hydrocarbons (0−4 wt %/wt) or 6.2% petroleum hydrocarbons extracted from Silver Lake sediments, a reduction in both the rate and extent of PCB dechlorination occurred. The maximal rate of dechlorination observed in these assays appears to depend singularly on the aqueous-phase PCB concentrations. A single-regression equation relating maximal PCB dechlorination rates to the PCB conce...