Assessment of levels of Heavy Metal Contents in Foods Sold to public in Benin City, Southern Nigeria

Abstract

Heavy metals contents (Zn, Cd, Fe and Pb) were analyzed in canned foods frequently consumed in Benin City. Samples were collected from major supermarkets. These samples were categorized into 3 distinctive groups of 3 varying brands with triplicates each of fish, beans and vegetables (Peas, Carrots and Green Beans). The metals were analyzed using atomic absorption spectrophotometer (AAS). The results showed significant differences (p < 0.05) in the values of Cu and Fe and a highly significant difference (p < 0.001) in Cd in the different brands of canned fish samples. Iron Fe, was found to be prevalent in all classes of food tested with values as high as 20.57±1.14 mg/l in Peas (Del Monte). Concentrations of Fe in body tissues must be highly monitored because in excessive amounts, it can lead to tissue damage. Similarly, for all brands of canned foods examined, Cd had the lowest mean concentration (0.01 ± 0.00) mg/kg in all brands of canned fish. A regular monitoring of canned foods available to the public is recommended to safeguard public health especially when recommended levels are exceeded.