Occurrence and Health Risk Assessment of Organochlorine Residues in Cowpea Grains Marketed in Abuja, Nigeria

Fagbohun Adebisi Akinyemi, D. Sunday, Anjorin Samuel Toba
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Abstract

The main objective of this study was to determine the prevalence and concentration level of organochlorine residue in marketed cowpea grains in the Federal Capital Territory (FCT) -Abuja, Nigeria, and assessed the health risk to the consumers. The randomly collected 140 samples were bulked into 28 laboratory samples for analysis. The samples were extracted and cleanup using Quick Easy Cheap Efficient Rugged and Safe (QuEChERS) methods. Twenty organochlorine compounds comprising benzene hexachloride (BHC), heptachlor, aldrin, chlordane, endosulfan, dichlorodiphenyltrichloroethane, methoxychlor, heptachlor, endosulfan, and their metabolites were quantified using gas chromatography-mass spectrophotometer (GC-MS). The recovery percentage of OCs residues were in the range of 90.1 to 93.7% and the limit of detection ranged between 0.00003 and 0.00020 mg kg-1. The prevalence of the contaminated cowpeas samples with p,p’-dichlorodiphenyltrichloethane (DDT), endosulfan sulphate, and endrin ketone was 89.29%. Aldrin, dieldrin pp’- p,p’-dichlorodiphenyldichloethylene (DDE), alpha BHC, Delta-BHC had an incidence of 75.00, 32.14 and 57.14 % respectively. None of the OC residues were detected in the cowpea grains obtained from Utako market (UW). Mean residual concentration of the OCs insecticides in the samples ranged between 0.000068 to 0.006633 mg kg-1. The mean concentration level of heptachlor epoxide (0.0550 mg kg-1), methoxychlor (0.0147 mg kg-1), and endrin ketone (0.0663 mg kg-1) were above the EU limits of 0.020, 0.010 and 0.050 mg kg-1 respectively.and the concentration level of all the other 17 compounds in all the samples were below the EU maximum limit. Human risk assessment indicated that all the detected OCs residues were within Acceptable Daily Intake (ADI). The mean value for Hazard index (HI) revealed that endrin ketone (27.2616) was > 1 while the combined health hazard of OCs was < 100 and consumption of the samples might poses health risk due to presence of the banned OCs. This study suggests that cowpea grains sold in the study area pose a potential health risk to the consumers.
尼日利亚阿布贾市场上销售的豇豆谷物中有机氯残留的存在与健康风险评估
本研究的主要目的是确定尼日利亚阿布贾联邦首都区(FCT)市场上销售的豇豆谷物中有机氯残留物的普遍程度和浓度水平,并评估其对消费者健康的风险。随机收集的 140 份样品被分成 28 份实验室样品进行分析。样品采用快速、简便、廉价、高效和安全(QuEChERS)方法进行提取和净化。采用气相色谱-质谱联用仪(GC-MS)对六氯化苯(BHC)、七氯、艾氏剂、氯丹、硫丹、二氯二苯三氯乙烷、甲氧氯、七氯、硫丹等 20 种有机氯化合物及其代谢物进行了定量分析。OCs 残留的回收率为 90.1% 至 93.7%,检出限为 0.00003 至 0.00020 mg kg-1。在受污染的豇豆样品中,p,p'-二氯二苯三氯乙烷(滴滴涕)、硫丹硫酸盐和异狄氏剂酮的检出率为 89.29%。艾氏剂、pp'- p,p'-二氯二苯基二乙烯(DDE)、甲型六氯环己烷、δ-六氯环己烷的发生率分别为 75.00%、32.14%和 57.14%。从乌塔科市场(Utako)获得的豇豆颗粒中未检测到任何 OC 残留。样品中 OC 类杀虫剂的平均残留浓度介于 0.000068 至 0.006633 毫克/千克之间。七氯环氧乙烷(0.0550 毫克/千克-1)、甲氧氯(0.0147 毫克/千克-1)和异狄氏剂酮(0.0663 毫克/千克-1)的平均浓度水平分别高于 0.020、0.010 和 0.050 毫克/千克-1 的欧盟限值。人体风险评估表明,所有检测到的 OCs 残留量都在每日允许摄入量(ADI)范围内。危害指数(HI)的平均值显示,异狄氏酮(27.2616)的危害指数大于 1,而 OCs 的综合健康危害指数小于 100。这项研究表明,研究地区销售的豇豆谷物对消费者的健康构成潜在风险。
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