Osuala Fidelia Ijeoma, Humphrey Olamide Florence, Igwo-Ezikpe Miriam Nwana, Udoh Arnold Godfrey, Adegbuyi Iyanuoluwa, Fasasi Mojeed, Agada Precious, Jimoh Azeemah, Okubamowo Olufunke
Department of Zoology, Faculty of Science, University of Lagos, Lagos, Nigeria.
Department of Biochemistry, Faculty of Basic Medical Sciences, College of Medicine, University of Lagos, Lagos, Nigeria.
Environ Anal Health Toxicol. 2024 Jun;39(2):e2024013-0. doi: 10.5620/eaht.2024013. Epub 2024 Apr 15.
Pest infestation in crop production have increased farmers' interest in pesticides use with short and long term consequences. This study investigated the occurrence and seasonal variations of organochlorine pesticide residues in vegetable farms in selected areas of Lagos State. Non carcinogenic and carcinogenic risk assessment was also evaluated. Soil samples were collected during the wet and dry seasons at soil depth of 0-30 cm. Gas chromatography coupled with an Agilent mass spectrometer was used to analyse organochlorine residues (alpha-lindane,lindane, delta.-lindane, aldrin, heptachlor epoxide, alpha.-endosulfan, p,p'-dichlorodiphenyldichloroethylene (p,p'-DDE), endrin, endosulfan, m,p'-dichlorodiphenyldichloroethane (m,p'-DDD), endosulfan sulfate, o,p'-dichlorodiphenyltrichloroethane (o,p'-DDT) and endrin ketone) in soil. Heptachlor epoxide showed maximum concentration of 43.03 mg/kg in Station 19 in Western zone during the dry season while m,p'-DDD and endosulfan had minimum value of 0.004 mg/kg in Station 2 and Station 5 respectively during the wet season in the Far eastern zone. The concentrations of organochlorine residues were intermediate in the Eastern zone in both seasons. There was significant (p < 0.05) increase in dry season concentrations when compared to wet season. The risk assessment indicated Hazard Quotient (HQ) > 1 for non-cancer risk and cancer risk > 10-6. Thus a need for stringent monitoring programs for pesticides.
农作物生产中的害虫侵扰增加了农民对农药使用的兴趣，这带来了短期和长期的后果。本研究调查了拉各斯州选定地区蔬菜农场中有机氯农药残留的发生情况和季节变化。还评估了非致癌和致癌风险。在雨季和旱季，于0 - 30厘米的土壤深度采集土壤样本。使用气相色谱仪与安捷伦质谱仪联用分析土壤中的有机氯残留（α-林丹、林丹、δ-林丹、艾氏剂、七氯环氧化物、α-硫丹、p,p'-二氯二苯二氯乙烯（p,p'-DDE）、异狄氏剂、硫丹、m,p'-二氯二苯二氯乙烷（m,p'-DDD）、硫丹硫酸盐、o,p'-二氯二苯三氯乙烷（o,p'-DDT）和异狄氏剂酮）。七氯环氧化物在旱季西部区域的第19号站点显示出最高浓度为43.03毫克/千克，而m,p'-DDD和硫丹在远东区域雨季时分别在第2号站点和第5号站点具有最低值0.004毫克/千克。两个季节中东部区域有机氯残留浓度处于中间水平。与雨季相比，旱季浓度有显著（p < 0.05）增加。风险评估表明非癌症风险的危害商（HQ）> 1，癌症风险> 10 - 6。因此需要对农药实施严格的监测计划。
