【摘要】 以太湖底泥为介质构建反应微环境,考察了商业产品Aroclor系列中9种常见多氯联苯单体(二氯联苯PCB5和PCB12、四氯联苯PCB64和PCB71、类二噁英五氯联苯PCB105和PCB114、六氯联苯PCB149和PCB153、七氯联苯PCB170)在24周时间内的脱氯降解情况.结果显示:太湖底泥中的天然微生物具备降解多氯联苯的能力,9种添加的母体多氯联苯均出现不同程度的脱氯现象,泥浆中多氯联苯总浓度由(49.56±0.38)mg/kg降至(42.19±0.14)mg/kg;脱氯方式以对位脱氯和间位脱氯为主,检测到的主要脱氯产物包括PCB1,PCB2,PCB25,PCB32,PCB47,PCB49,PCB52,PCB66,PCB90,PCB99,PCB101和PCB102;在24周内,微环境体系总二噁英毒性当量(TEQs)从(297±2)pg/g降至(21±5)pg/g,降幅达92.9%,显示出良好的环境解毒效果.更多还原

【Abstract】 Dechlorination of 9 commercially available polychlorinated biphenyl( PCB) congeners including PCB5,PCB12,PCB64,PCB71,PCB105,PCB114,PCB149,PCB153 and PCB170 was examined in Taihu Lake sediment microcosms in a time course of 24 weeks. The results show that native microorganisms in Taihu Lake sediments are capable of dechlorinating PCBs; the nine added cogeners exhibit different extent of dechlorination; total PCBs in slurry reduce from( 49. 56 ± 0. 38)mg/kg to( 42. 19 ± 0. 14) mg/kg; Para and meta removals are prevalent. The dominant observed dechlorination products include PCB1,PCB2,PCB25,PCB32,PCB47,PCB49,PCB52,PCB66,PCB90,PCB99,PCB101 and PCB102. After 24 weeks of incubation,the total TEQs reduce from( 297 ± 2) pg/g to( 21 ± 5) pg/g. Dechlorination leads to a reduction of TEQs by 92. 9%,suggesting an apparent environmental detoxification.更多还原