Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China.
Chemosphere. 2011 Oct;85(3):344-50. doi: 10.1016/j.chemosphere.2011.06.096. Epub 2011 Aug 2.
This study aimed at identifying the levels of PCBs generated from e-waste recycling, and their potential impacts on the soils and vegetations as well. The ΣPCBs concentrations in soil and plant samples ranged from 7.4 to 4000 ng g(-1) and from 6.7 to 1500 ng g(-1), respectively. For the plant samples, Chrysanthemum coronarium L. from vegetable field and the wild plant Bidens pilosa L. from the burning site showed relatively higher PCB concentrations than other species. For the soil samples, the e-waste burning site had relatively higher PCB concentrations than the adjacent areas, and vegetable soils had higher PCB concentrations than paddy soils. The PCB concentrations showed a clear decreasing trend with the increasing distance from the e-waste recycling site. PCB 28, 99, 101, 138, 153, and 180 were the predominant congeners. Principal component analysis results showed a potential fractionation of PCB compositions from the burning site to the surroundings. The PCB congener pattern at the burning site was similar to Arochlor 1260, pointing to an input of non-domestic e-waste. Similar PCB congeners were found in soils and related vegetables, indicating they derived from the same source. The consumption of vegetables grown in soils near e-waste recycling sites should be strictly avoided due to the high PCBs in the plant tissues.
本研究旨在确定电子废物回收过程中产生的多氯联苯水平及其对土壤和植被的潜在影响。土壤和植物样本中ΣPCBs 的浓度范围分别为 7.4 至 4000ng/g 和 6.7 至 1500ng/g。对于植物样本，来自菜地的菊花（Chrysanthemum coronarium L.）和来自焚烧点的野生植物鬼针草（Bidens pilosa L.）的 PCB 浓度相对较高，高于其他物种。对于土壤样本，电子废物焚烧点的 PCB 浓度相对较高，毗邻区域的浓度较低，菜地土壤的 PCB 浓度高于稻田土壤。随着与电子废物回收地点的距离增加，PCB 浓度呈现明显下降趋势。PCB 28、99、101、138、153 和 180 是主要的同系物。主成分分析结果表明，PCB 成分从焚烧点到周围环境存在潜在的分馏。焚烧点的 PCB 同系物模式与 Arochlor 1260 相似，表明有非国内电子废物的输入。在土壤和相关蔬菜中发现了相似的 PCB 同系物，表明它们来自同一来源。由于植物组织中存在高浓度的 PCB，应严格避免食用在电子废物回收点附近土壤中种植的蔬菜。
