MOE Key Laboratory of Regional Energy and Environmental Systems Optimization, Environmental Research Academy, North China Electric Power University, Beijing 102206, China.
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
Ecotoxicol Environ Saf. 2015 Dec;122:343-51. doi: 10.1016/j.ecoenv.2015.08.006. Epub 2015 Sep 20.
Plastic wastes are increasingly being recycled in many countries. However, available information on the metals released into the environment during recycling processes is rare. In this study, the contamination features and risks of eight heavy metals in soils and sediments were investigated in Wen'an, a typical plastic recycling area in North China. The surface soils and sediments have suffered from moderate to high metal pollution and in particular, high Cd and Hg pollution. The mean concentrations of Cd and Hg were 0.355 and 0.408 mg kg(-1), respectively, in the soils and 1.53 and 2.10 mg kg(-1), respectively, in the sediments. The findings suggested that there is considerable to high potential ecological risks in more than half of the soils and high potential ecological risk in almost all sediments. Although the health risk levels from exposure to soil metals were acceptable for adults, the non-carcinogenic risks to local children exceeded the acceptable level. Source assessment indicated that heavy metals in soils and sediments were mainly derived from inputs from poorly controlled plastic waste recycling operations in this area. The results suggested that the risks associated with heavy metal pollution from plastic waste recycling should be of great concern.
塑料废物在许多国家越来越多地被回收利用。然而，关于回收过程中释放到环境中的金属的可用信息却很少。在这项研究中，调查了中国北方典型的塑料回收区文安的土壤和沉积物中八种重金属的污染特征和风险。表层土壤和沉积物受到了中等到高度的金属污染，特别是 Cd 和 Hg 的污染严重。土壤中 Cd 和 Hg 的平均浓度分别为 0.355 和 0.408mgkg(-1)，沉积物中分别为 1.53 和 2.10mgkg(-1)。研究结果表明，超过一半的土壤具有相当大到高的潜在生态风险，几乎所有的沉积物都具有高的潜在生态风险。尽管成年人接触土壤中金属的健康风险水平是可以接受的，但当地儿童的非致癌风险超过了可接受水平。来源评估表明，土壤和沉积物中的重金属主要来自该地区塑料废物回收作业中控制不力的输入。研究结果表明，应高度关注塑料废物回收产生的重金属污染的风险。
