College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China.
College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China.
Molecules. 2021 Apr 9;26(8):2169. doi: 10.3390/molecules26082169.
Serious pollution of multiple chemicals in irregulated e-waste recycling sites (IR-sites) were extensively investigated. However, little is known about the pollution in regulated sites. This study investigated the occurrence of 21 polybrominated diphenyl ethers (PBDEs) and 10 metals in a regulated site, in Eastern China. The concentrations of PBDEs and Cd, Cu, Pb, Sb, and Zn in soils and sediments were 1-4 and 1-3 orders of magnitude lower than those reported in the IR-sites, respectively. However, these were generally comparable to those in the urban and industrial areas. In general, a moderate pollution of PBDEs and metals was present in the vegetables in this area. A health risk assessment model was used to calculate human exposure to metals in soils. The summed non-carcinogenic risks of metals and PBDEs in the investigated soils were 1.59-3.27 and 0.25-0.51 for children and adults, respectively. Arsenic contributed to 47% of the total risks and As risks in 71.4% of the total soil samples exceeded the acceptable level. These results suggested that the pollution from e-waste recycling could be substantially decreased by the regulated activities, relative to poorly controlled operations, but arsenic pollution from the regulated cycling should be further controlled.
本研究调查了中国东部一个受监管场地中 21 种多溴二苯醚 (PBDEs) 和 10 种金属的污染情况。与未经监管的电子废物回收场 (IR-sites) 相比，土壤和沉积物中 PBDEs 和 Cd、Cu、Pb、Sb 和 Zn 的浓度分别低 1-4 和 1-3 个数量级。然而，这些浓度通常与城市和工业区相当。总的来说，该地区蔬菜中存在中等程度的 PBDEs 和金属污染。本研究采用健康风险评估模型来计算人体对土壤中金属的暴露。在所研究土壤中，金属和 PBDEs 的非致癌风险总和分别为儿童和成人的 1.59-3.27 和 0.25-0.51。砷对总风险的贡献为 47%，且 71.4%的土壤样本中的砷风险超过了可接受水平。这些结果表明，与不受控制的操作相比，受监管的活动可显著减少电子废物回收造成的污染，但应进一步控制受监管循环过程中的砷污染。
