南渡河沿岸水稻田土壤有机氯农药污染及健康风险评价  

Soil organochlorine pesticide pollution and health risk assessment in paddy field along Nandu River

作　　者：王璟 陈碧珊 叶林海 卢芷晴 钟诗明 李炎松 李烨 冯婷婷 宋军霞 WANG Jing;CHEN Bi-shan;YE Lin-hai;LU Zhi-qing;ZHONG Shi-ming;LI Yan-song;LI Ye;FENG Ting-ting;SONG Jun-xia(School of Geographical Sciences,Lingnan Normal University,Zhanjiang 524048,Guangdong,China)

机构地区：[1]岭南师范学院地理科学学院,广东湛江524048

出　　处：《湖北农业科学》2023年第3期149-156,共8页Hubei Agricultural Sciences

基　　金：广东省基础与应用基础研究基金区域联合基金青年基金项目(2019A1515110888);岭南师范学院大学生创新创业训练计划项目(X202110579021)。

摘　　要：采集雷州市南渡河上、中、下游26个土壤样品,利用气相色谱法测定残留在土壤中的有机氯农药,并利用健康风险评价模型和主成分分析对广东省雷州市南渡河沿岸水稻田土壤中有机氯残留所致风险进行评价。结果表明,南渡河沿岸水稻田土壤中六氯苯、o,p′-滴滴伊、p,p′-滴滴伊、o,p′-滴滴滴、p,p′-滴滴滴、o,p′-滴滴涕、α-666等均有检出,其中六氯苯检出率最高,为96.15%,p,p′-滴滴伊检出率为92.31%,p,p′-滴滴滴和o,p′-滴滴涕检出率分别为84.62%和76.92%。这些成分是农用地土壤有机氯残留的主要污染来源,其中DDT异构体p,p′-滴滴滴、o,p′-滴滴涕、p,p′-滴滴伊、o,p′-滴滴伊、o,p′-滴滴滴5个变量在第一主成分上有较高载荷,可能与过去喷施三氯杀螨醇有关。流域内有机氯农药残留差异明显,总体表现为中游>下游>上游。健康风险评价结果显示,各类有机氯污染对人体的健康风险较低,属于可接受水平。26 soil samples were collected from the upper,middle and lower reaches of Nandu River in Leizhou City,Guangdong Prov⁃ince,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 com⁃ponent,which might be related to the past application of dicofol.There was a significant difference in organochlorine pesticide resi⁃dues 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.

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 

分 类 号：X820.4[环境科学与工程—环境工程]