关键词: 有机氯农药污染, 水稻田, 土壤, 健康风险, 雷州市南渡河

Abstract: 26 soil samples were collected from the upper, middle and lower reaches of Nandu River in Leizhou City, Guangdong Province, and the residual organochlorine pesticides in soil were determined by gas chromatography. The health risk assessment model and principal component analysis were used to evaluate the risk caused by organochlorine residues in rice soil along the Nandu River in Leizhou City, Guangdong Province. The results showed that hexachlorobenzene, o,p′-DDE, p,p′-DDE, o,p′-DDD, p,p′-DDD, o,p′-DDT, α-HCH were detected in rice fields and soils along the Nandu River. The detection rate of hexachlorobenzene was the highest, which was 96.15%, and the detection rate of p,p′-DDE was 92.31%. The detection rates of p,p′-DDD and o,p′-DDT were 84.62% and 76.92%, respectively. These components were the main pollution sources of organochlorine residues in agricultural soil. Among them, DDT isomer p,p′-DDD, o,p′-DDT, p,p′-DDE, o,p′-DDE, o,p′-DDD had a higher load on the first principal component, which might be related to the past application of dicofol. There was a significant difference in organochlorine pesticide residues in the basin, and the overall performance was middle reaches > lower reaches > upper reaches. Health risk assessment results showed that all kinds of organochlorine pollution to human health risk was low, and belonged to the acceptable level.

Key words: organochlorine pesticide pollution, rice fields, soil, health risks, Nandu River in Leizhou City