Key Laboratory for Yellow River and Huai River Water Environmental and Pollution Control, Ministry of Education, Henan Key Laboratory for Environmental Pollution Control, School of Environment, Henan Normal University, Xinxiang, 453007, China.
Environ Sci Pollut Res Int. 2015 Aug;22(15):11626-33. doi: 10.1007/s11356-015-4321-1. Epub 2015 Apr 7.
We investigated the concentration and composition of polychlorinated biphenyls (PCBs) in paddy soils and rice tissues and the associated potential health risks in the urban agricultural areas of the Pearl River Delta (PRD), South China. The results indicated that highly chlorinated PCBs were more prominent in soil when the concentrations of low-molecular-weight PCBs were relatively high in rice plants. There was a trend of decreasing PCB concentrations with soil depth and a significant correlation between PCBs and the total organic carbon or total nitrogen concentration in section soils. The PCB concentrations followed the order of root > leaf > stem > grain. Although the dioxin toxicity equivalency values and estimated daily intake levels (based direct and indirect consumption) were lower than in other seriously contaminated regions, there is still a need to monitor PCB pollution in urban agriculture because of the PCB emissions from capacitor storage following the rapid urbanization experienced in the PRD.
我们研究了珠江三角洲（PRD）城市农业区水稻土和水稻组织中多氯联苯（PCBs）的浓度和组成，以及相关的潜在健康风险。结果表明，在水稻植株中低分子量 PCBs 浓度相对较高时，土壤中高氯化 PCB 更为突出。随着土壤深度的增加，PCBs 浓度呈下降趋势，且在土壤剖面上 PCBs 与总有机碳或总氮浓度之间存在显著相关性。PCBs 的浓度顺序为根>叶>茎>粒。虽然二恶英毒性当量值和（基于直接和间接消费的）估计日摄入量水平低于其他污染严重的地区，但由于 PRD 快速城市化导致电容器存储释放 PCB，仍需监测城市农业中的 PCB 污染。
