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【成果】我院博士后刘冉冉等在Environment International杂志上发表电子垃圾拆解过程多环芳烃及衍生物的污染排放和健康风险评估最新学术论文
2020-09-07 10:44     (阅读)

近日,广东工业大学环境健康与污染控制研究院、环境科学与工程学院刘冉冉博士后等在电子垃圾拆解过程多环芳烃及衍生物的环境污染及健康风险评估方面取得最新研究进展,研究成果以《Field study of PAHs with their derivatives emitted from e-waste dismantling processes and their comprehensive human exposure implications, 2020, 144: 106059》为题发表在国际环境与人体健康领域顶级期刊Environment International上。该工作测定了五个典型热解电子线路板回收车间内多环芳烃PAHs及其衍生物的污染特征。结果表明:不同拆解车间内可产生高浓度的PAHs、氯代PAHsClPAHs)、溴代PAHsBrPAHs)、氧PAHsOPAHs)和咔唑(CBZ)浓度差异较大。其中电烤锡炉拆解车间污染最为严重。对于不同的PAHs衍生物而言,OPAHs含量最高,9,10-蒽醌是电烤锡炉处理电视机线路板回收车间主要的OPAHs同系物,而苯并(a)蒽-7,12-酮在其它拆解车间占据绝对优势。此外不同拆解车间内∑ClPAHs均以9,10-Cl2Phe贡献最大(电吹风处理手机板除外),BrPAHs的组成特征则截然不同。除母体PAHs的直接氯化作用,电子垃圾塑料中卤代阻燃剂的高温热解可能是导致电子垃圾拆解活动中高浓度Cl/BrPAHs的主要因素。虽然BrPAHs的特定组成比率(3-BrFlu/1-BrPyr1-BrPyr/3-BrFlu)可作为区分线路板热解与其他污染源的新型示踪剂,但其环境应用还需进一步的验证。针对这些污染物的呼吸暴露风险评估表明:所有五个拆解车间内PAHs及其衍生物均可对拆解工人造成呼吸致癌风险,尤其是电烤锡炉回收路由器车间的风险最高。本研究通过分析测定电子垃圾拆解活动中PAHs和其衍生物的含量及其健康风险评估,为电子垃圾行业PAHs源解析及潜在健康风险研究提供了崭新视角。另一方面,我们试图通过本研究呼吁对电子垃圾拆解过程排放的PAHs及衍生物所引起的潜在致癌风险引起高度关注。

论文的DOIhttps://doi.org/10.1016/j.envint.2020.106059

论文的网址:https://www.sciencedirect.com/science/article/pii/S0160412020320146

论文的英文摘要如下:

              Extensive electronic waste (e-waste) recycling might be an important emission source of polycyclic aromatic hydrocarbons (PAHs) mixture, which might induce negative effects on the employees. In the present work, atmospheric pollution patterns of PAHs and their derivatives were determined in five different workshops to dismantle waste printed circuit boards (WPCBs) via thermal treatment. The results showed that mass concentrations of PAHs, chlorinated PAHs (ClPAHs), brominated PAHs (BrPAHs), oxy-PAHs (OPAHs) as well as carbazole (CBZ) were ranged from 1.53 × 104 − 2.02 × 105, 32.3 − 364, 8.29 1.13 × 103, 923 1.39 × 104 and 2251.95 × 103 pg·m-3, respectively. Electric heating furnaces workshops emitted relatively higher contaminants than other disposal sectors. OPAHs was found to be the most predominant derivatives of PAHs with 9,10-anthraquinone (83.0%) has the absolute superior in EHFTV, while benzo(a)anthracene-7,12-dione (> 45.0%) was found to be the highest congener in other workshops, respectively. 9,10-Cl2Phe exhibited the largest contributions to the ∑ClPAHs whereas the composition profiles of BrPAHs varied among five workshops. In addition to direct chlorination of parent PAHs, thermal degradation of halogenated flame retardants incorporated into plastic materials might dominate the generation of Cl/BrPAHs from e-waste dismantling activities. The specific isomeric ratios of BrPAHs (3-BrFlu/1-BrPyr and 1-BrPyr/3-BrFlu) might be used to discriminate other emission sources from pyrolysis of WPCBs. However, their specific application as novel tracers for source identification should be further verified with more studies. The emitted PAHs mixture with their derivatives in all dismantling workshops posed carcinogenic risks to these dismantling workers via inhalation, particularly the workshop using electric heating furnaces to treat router. Nevertheless, new loadings of PAHs derivatives observed from e-waste dismantling activities, as well as their comprehensive health risk assessment provides us with a fresh perspective on the source appointment and potential adverse consequences of PAHs. More attention needs to be paid to the potential carcinogenic risks of exposure to PAHs and its derivatives from e-waste dismantling processes.

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