Polychlorinated biphenyls in agricultural soils from the Yangtze River Delta of China: Regional contamination characteristics, combined ecological effects and human health risks
Polychlorinated biphenyls in agricultural soils from the Yangtze River Delta of China: Regional contamination characteristics, combined ecological effects and human health risks
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中国长江三角洲农业土壤中多氯联苯的区域污染特征、综合生态效应和人类健康风险
DOI：
10.1016/j.chemosphere.2016.08.038
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发表时间：
2016
期刊：
影响因子：
8.8
通讯作者：
Li Xiangdong
中科院分区：
文献类型：
--
作者：
Sun Jianteng;Pan Lili;Tsang Daniel C. W.;Zhan Yu;Liu Wenxin;Wang Xilong;Zhu Lizhong;Li Xiangdong
研究了长江三角洲农业土壤中多氯联苯（PCBs）的污染现状。多氯联苯的浓度从<0.1到130纳克/克干重不等。在0-30厘米表层土壤中观察到的多氯联苯浓度高于次表层土壤。从西北到东南，浓度梯度下降，观察到一个明显的空间分布。土壤中PCBs的组成与中国商用多氯联苯混合物一致，但与全球背景土壤中的PCBs组成不同。本地来源，包括大规模使用和处置含多氯联苯的产品是土壤的主要潜在来源。进一步评估了多氯联苯、有机氯农药、邻苯二甲酸酯和多溴联苯醚等混合持久性有机污染物的生态效应和人体健康风险。4种有毒有机物和7个理化参数加在一起只能解释12.7%的微生物群落组成变异，说明低浓度复合污染对土壤生态系统功能影响不大。然而，多氯联苯通过多种途径对居民的潜在健康风险明显高于其他化学品。潜在风险主要来自PCB-126、81和169。
The current contamination status of polychlorinated biphenyls (PCBs) was studied in the agricultural soils of the Yangtze River Delta (YRD), one of the largest economic zones in China. The concentrations of PCBs ranged from <0.1 to 130 ng/g dry weight. Higher concentrations of PCBs were observed in the 0–30 cm surface layers relative to the subsurface soils. A distinct spatial distribution was observed with a declining concentration gradient from the northwest to the southeast of the region. The composition of PCBs in the soils was consistent with the Chinese commercial PCB mixtures, but different from the compositions in global background soil. Local sources including large-scale use and disposal of PCB-containing products were the main potential sources to soil. The ecological effects and human health risks associated with combined persistent organic pollutants, including PCBs, organochlorine pesticides (OCPs), phthalate esters (PAEs) and polybrominated diphenyl ethers (PBDEs), were further estimated. The four toxic organic compounds and seven physicochemical parameters together could only explain 12.7% of the variation in microbial community composition, suggesting the soil ecosystem function was not strongly influenced by the combined pollution at low concentrations. However, the potential health risks to residents via multiple pathways were notably higher for PCBs than other chemicals. The potential risks were mainly derived from PCB-126, 81, and 169.