Huang Jingyu, Amuzu-Sefordzi Basil, Li Ming
Ministry of Education Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, College of Environment, Hohai University, No. 1 Xikang Road, Nanjing, 210098, China.
Environ Monit Assess. 2015 May;187(5):254. doi: 10.1007/s10661-015-4466-x. Epub 2015 Apr 16.
The Pearl River Delta is one of the biggest electronics manufacturing regions in the world. Due to the presence of abandoned industrial sites and the proliferation of large-scale electronics companies in the past four decades, it is therefore imperative to investigate the extent of heavy metals and polychlorinated biphenyls (PCBs) contamination in the region. Spatial and temporal distribution of heavy metals (Cr, Cu, Ni, Pb, and Zn) and PCBs (PCB28, PCB52, PCB101, PCB118, PCB138, PCB153, and PCB180) in the Lianhua Mountain reservoir in the Pearl River Delta, Dongguan City, China were examined based on a sedimentary profile analysis. Higher concentrations of the heavy metals detected were recorded in bottom sediments whereas 70% of the detected PCBs recorded maximum concentrations in top sediments. The geo-accumulation indices (Igeo) indicate that the study area is uncontaminated to moderately contaminated. Also, the integrated pollution indices (IPI) were above 1, except Pb, which shows that the study area is contaminated with heavy metals from anthropogenic sources. The concentrations of individual heavy metals and PCBs over a period of 60 years were also analyzed in order to establish a historical trend of pollution in the study area. This study provides baseline information on the level and historical trend of heavy metals and PCBs pollution in the study area.
珠江三角洲是世界上最大的电子制造地区之一。由于过去四十年来废弃工业场地的存在以及大规模电子公司的激增，因此有必要调查该地区重金属和多氯联苯（PCBs）的污染程度。基于沉积剖面分析，对中国东莞市珠江三角洲莲花山水库中的重金属（铬、铜、镍、铅和锌）和多氯联苯（PCB28、PCB52、PCB101、PCB118、PCB138、PCB153和PCB180）的时空分布进行了研究。检测到的重金属在底部沉积物中的浓度较高，而70%检测到的多氯联苯在顶部沉积物中的浓度最高。地累积指数（Igeo）表明研究区域未受污染至中度污染。此外，综合污染指数（IPI）除铅外均高于1，这表明研究区域受到来自人为源的重金属污染。为了确定研究区域污染的历史趋势，还分析了60年内单个重金属和多氯联苯的浓度。本研究提供了研究区域重金属和多氯联苯污染水平及历史趋势的基线信息。
