Assessment of trace metals in drinking water andudgroundwater sources in Ota, Nigeria

摘要

The levels of six trace metals namely iron, lead,udmanganese, copper, zinc and nickel were investigated in drinkingudwater and groundwater sources in Ota, Nigeria. Detectedudconcentrations of Mn, Cu and Zn were below the World Healthudorganization and Standard Organization of Nigeria maximumudpermissible limits. Fe (92%) and Ni (53%) in some drinkingudwater and groundwater sources were found in concentrations thatudexceeded the maximum permissible limits for these metals.udNotably, the levels of Pb were below detection limit in all theudbottled, well and borehole water, with exception of the hospitaludborehole, while the swimming pool had high concentrations ofudFe (0.88 mg/L), Pb (0.21 mg/L) and Ni (0.19mg/L) compared toudSON (0.30 mg/L), WHO (0.01 mg/L) and WHO (0.07 mg/L)udrespectively. Pollution indices indicated significant pollution ofudPb, Fe and Ni. Overall, the mean metal levels in the sampledudwater sources followed a descending order,udFe>Cu>Zn>Ni>Pb>Mn. Some of the drinking water andudgroundwater sources could be considered safe for drinking, butudproactive measures should be taken to check the levels of Fe, Pbudand Ni in the swimming pool.