Guangdong Provincial Key Laboratory of Petrochemical Pollution Processes and Control, School of Environmental Science and Engineering, Guangdong University of Petrochemical Technology, Maoming 525000, China.
Department of Environmental Sciences, College of Earth and Environment Sciences, Lanzhou University, Lanzhou 730000, China.
Int J Environ Res Public Health. 2022 Oct 13;19(20):13171. doi: 10.3390/ijerph192013171.
To reveal the pollution status of agricultural soils along with rapid urbanization and economic growth, a large regional survey of organochlorine pesticides (OCPs) in agricultural soils was conducted in the Pearl River Delta (PRD) of China. The results showed that the total residues of 23 OCPs were in the range of ND-946 ng/g dry weight. OCP residues showed distinct spatial distribution characteristics within the PRD. OCPs were mainly found in areas with high agricultural production and industrial activities. Higher OCP concentrations were observed in the top layer of soil, while the concentration decreases to marginal levels when the soil depth is greater than 50 cm. OCPs are mainly derived from historical use. Hexachlorocyclohexanes (HCHs) in the top soil of the study area are mainly from the use of lindane. Soil pH was negatively and significantly correlated with total OCP concentration. The human health risk assessment showed no health risk for children, while for adults, there is a non-carcinogenic risk, which needs to be noticed. Agricultural activities and industrial production have made the region a pollution hotspot and should arouse more stringent regulation to protect the environment and food safety.
为了揭示农业土壤在快速城市化和经济增长过程中的污染状况，在中国珠江三角洲（PRD）进行了一项针对农业土壤有机氯农药（OCPs）的大型区域性调查。结果表明，23 种 OCP 的总残留量在 ND-946ng/g 干重范围内。OCP 残留具有明显的空间分布特征。OCPs 主要存在于高农业生产和工业活动的地区。在土壤的顶层观察到更高的 OCP 浓度，而当土壤深度大于 50 厘米时，浓度降至边缘水平。OCP 主要来源于历史用途。研究区域顶层土壤中的六氯环己烷（HCHs）主要来自林丹的使用。土壤 pH 值与总 OCP 浓度呈负显著相关。人体健康风险评估显示，儿童没有健康风险，但对于成年人，存在非致癌风险，需要引起注意。农业活动和工业生产使该地区成为污染热点，应加强监管，以保护环境和食品安全。
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