Determination of Organochlorine Residues in Cowpea (Vigna unguiculata L. WALP) From Selected Markets in Ibadan, Oyo State, Nigeria

Abstract

Cowpea (Vigna unguiculata(L.) Walp) is one of the major stale plant protein food crops in Nigeria, but constantly being attacked by insects especially during storage. This has been a major production constraint which usually necessitated the use of synthetic pesticides and chemicals, but comes with the problems of high pesticides residues. In cowpea, only few information or research has been made as regarding the level of pesticides residues, therefore the objective of this study was to identify the awareness level and organochlorine insecticides residue presence trendy to cowpea grains. This study was carried out using a multiple choice questionnaire, in which three markets in Ibadan were selected as the case study due to their population and patronisation. The multiple choice questionnaire was used in getting information as regarding the pesticide used, method of application, duration of storage after pesticide application and level of awareness on the possible side effects of pesticides. Thirty samples of cowpea were collected from the selected three markets for residue analysis which was determined in an analytical laboratory using standard procedures. Data collected were analysed using descriptive statistics. Results showed that Fumigation, spraying and baiting were the mostly used method of application of pesticides and Aluminium phosphide, Betoxin and Quickphos were the mostly used pesticides during application. Higher percentage (56.67%) of the respondent store the food stuff for less than a month before exposing it to the market for sales, about 53.3% of the respondents shows their ignorance about the health hazard associated with pesticides. Organochlorine pesticide residues were detected in all the samples of cowpea grains examined with highest mean concentration of Endosulfan (0.7500 mg/kg 0.3508).