Influence of E-Waste Dismantling and Its Regulations: Temporal Trend, Spatial Distribution of Heavy Metals in Rice Grains, and Its Potential Health Risk
Influence of E-Waste Dismantling and Its Regulations: Temporal Trend, Spatial Distribution of Heavy Metals in Rice Grains, and Its Potential Health Risk
复制标题
电子垃圾拆解及其监管的影响：米粒中重金属的时间趋势、空间分布及其潜在健康风险
DOI：
10.1021/es304903b
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发表时间：
2013-07-02
影响因子：
11.4
通讯作者：
Jiang, Guibin
中科院分区：
文献类型：
--
作者：
Fu, Jianjie;Zhang, Aiqian;Jiang, Guibin
自2005年以来，中国一些电子垃圾拆解区在环境和经济方面都实施了强化监管、集中拆解流程和先进的回收技术。本研究于2006年至2010年在电子垃圾拆解区采集了大米样品，调查了As、Cd、Cu和Pb的时间趋势和空间分布。电子垃圾拆解区大米样品中As、Cd、Cu和Pb的几何平均值分别为111、217、4676和237 ng g(-1)。采样期间Pb含量呈显着下降趋势，而其他三种元素则保持相对稳定甚至上升。电子垃圾拆解区的Cd、Cu、Pb浓度显着高于非电子垃圾拆解区（p < 0.05），表明电子垃圾拆解活动与Pb、Cu、Cd含量升高之间存在密切联系。对人类食用大米的风险评估显示，电子垃圾拆解区60%以上的镉危害商超过1。我们的研究表明，更严格地实施监管措施可能会对控制某些重金属向环境的释放产生积极影响。然而，环境行为因单个元素的地球化学特征而异。可能仍需要采取进一步的整治行动，以减少对周围环境的重金属污染。
Enhanced regulations, centralized dismantling processes, an sophisticated recycling technologies have been implemented in some e-waste dismantling areas in China with regard to environmental and economic aspects since 2005. In this study, rice grain samples were collected from 2006 to 2010 in an e-waste dismantling area to investigate the temporal trends and spatial distribution of As, Cd, Cu, and Pb. Geometric means of As, Cd, Cu, and Pb in rice samples from the e-waste dismantling area were 111, 217, 4676, and 237 ng g(-1), respectively. Levels of Pb showed a significant decreasing trend during the sampling period, whereas the other three elements remained relatively constant or even increased. Concentrations of Cd, Cu, and Pb in the e-waste dismantling area were significantly higher than those in the non-e-waste dismantling area (p < 0.05), which showed a close connection between e-waste dismantling activities and elevated Pb, Cu, and Cd contents. Risk assessment for human via rice consumption indicated that over 60% of the hazard quotient of Cd exceeded 1 in the e-waste dismantling area. Our study implied that stricter implementation of regulatory measures might lead to positive effects in controlling the release of some heavy metals to the environment. However, environmental behaviors differed with geochemical characteristics of individual elements. Further remediation actions to reduce heavy metal pollution to the surrounding environment might still be needed.