Elevated levels of polychlorinated biphenyls in plants, air, and soils at an E-waste site in Southern China and enantioselective biotransformation of chiral PCBs in plants.

摘要: E-waste that contains polychlorinated biphenyls (PCBs) is moved across national boundaries, often from industrialized countries in the northern hemisphere, where items were formerly used, to subtropical and tropical regions southeastern Asia Africa. As a result, there high likelihood PCBs will be released into environment primary source due elevated temperatures encountered these low-latitude regions. In present study, enantiomer fractions (EFs) of chiral (PCB 84, 95, 132, 136, 149, 183) analyzed air, eucalyptus leaves, pine needles, soil at an e-waste site rural southern China. The concentrations ranged 7825 76330 pg/m(3), 27.5 1993 ng/g, 24.2 12045 ng/g air (gas plus particle), plant soils, respectively. atmospheric PCB composition profiles study indicated relatively abundances penta- hexa-PCBs, which different those previously observed Clausius-Clapeyron regression analysis evaporation local contaminated surfaces constitutes emission site. signatures essentially racemic (mean EFs = (0.484 ± 0.022)-(0.499 0.004) gaseous phase) except for 84 (0.420 0.050), indicating sources dominate air. soils ((0.422 0.038)-(0.515 0.016)) similar 95. However, plants (especially leaves) had significantly nonracemic residues ((0.368 0.075)-(0.561 0.045)) compared soil. This finding suggests enantioselective biotransformation atropisomeric was very likely occur possibly metabolism by cytochrome P-450 enzymes leaves. To our knowledge, this first report on under field conditions.