Bio–Assessment of Heavy Metals in Leafy Vegetables from Selected Agricultural Farms in Lagos State, Nigeria
ABSTRACTVegetables grown on environmentally contaminated sites could take up and accumulate metals at concentration that are toxic to human health. This study analysed heavy metals in some leafy vegetables cultivated on some commercial farms within the Lagos metropolis. Three vegetables species namely Telfairia occidentalis (Ugwu), Corchorus olitorius (Ewedu) and Celosia argentea (Shoko) were sampled from various locations within three selected farmlands and tested for levels of Arsenic (As),
... of Arsenic (As), Cadmium (Cd), Iron (Fe), Lead (Pb), Zinc (Zn), Nickel (Ni) and Cupper (Cu) using Atomic Absorption Spectrometry. The results showed that levels of metals As, Cd, Fe, Zn, Pb, Ni and Cu ranges from 0.02±0.01 to 23.50±2.01 µg/g, Cd concentration levels ranged between 0.42±0.21 to 1.96±1.10 µg/g, Fe level ranged between 4.11±0.88 to 16.82±12.00 µg/g, Pb concentrations ranged between 2.30±0.01 to 5.60±1.47 µg/g, Zn contents ranged between 3.24±1.34 to 23.50 µg/g and Cu ranged between 1.60±0.46 to 4.93±0.39 µg/g respectively for all vegetable sampled. The analysis revealed that Zinc showed the highest concentration in C. olitorius and Iron in T. occidentalis at 23.50 µg/g and 16.82 µg/g respectively while the Arsenic showed the lowest level of 0.02 µg/g in C. argentea amongst all vegetables studied. The amount of heavy metals found in these vegetables were within safety baseline for human consumption. However, due to associated health risks vegetables contaminated with heavy metals should not be consumed.