Analysis of some selected toxic metals and pesticide residues in ofada rice (oryza sativa l.) samples produced in south western region of Nigeria.
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Journal of Industrial Research and Technology
Rice (Oryza sativa L.) is the most important cereal crop in the developing world and is the staple food of over half the world's population. It is generally considered a semi-aquatic annual grass plant. About 20 species of the genus are recognized, but nearly all cultivated rice is O. sativa L. thus the need to evaluate the toxic metal and pesticide content. This study aim to determine the concentration of heavy metals and pesticide residues in ofada rice samples obtained from major markets in 10 local governments in Lagos state, Nigeria. The rice samples were digested using concentrated nitric acid and the digested samples were analyzed using atomic absorption spectrophotometer. The extractions of the pesticides from the rice samples were done using QuEChERS method of extraction. Fifteen types of pesticides were analyzed using the GC-MS. The result showed that all the metals were present in the rice samples. The concentration of lead in each sample ranged from 0.054-0.139μg/g, Copper 1.265-27.652μg/g, Arsenic 0.080-0.207μg/g, Mercury 0.039-0.093μg/g, and Cadmium 0.255-0.650μg/g. The Oral Component Limit for lead, copper, arsenic, mercury and cadmium as stated by the USP are 1 μg/g, 250 μg/g, 1.5 μg/g, 1.5 μg/g, 0.5 μg/g respectively. All the metals except cadmium in 3 samples have concentrations below the USP. The rice sample had no detectable amount of pesticide residue as the concentrations are below detection limit. All the samples contained detectable amount of the metal of interest suggesting significant risk to consumers considering the toxicity and half-lives of heavy metals. Keywords: Ofada, heavy metals, pesticides, Lagos, spectrophotometer, GCMS
Ofada , Heavy metals , Pesticides , Spectrophotometer , Research Subject Categories::PHARMACY::Pharmaceutical chemistry
Aderonke A. Adepoju-Bello, Bamisaye O. Oyawaluja and Doyinsola G. Sosanya (2019). Analysis of some selected toxic metals and pesticide residues in ofada rice (oryza sativa l.) samples produced in south western region of Nigeria. Journal of Industrial Research and Technology, 8(1):27-44.