EVALUATION OF HEAVY METALS IN AUTO-MECHANICAL DUMPSITES

Abstract

This research was carried out to analyse some selected heavy metals in automechanic dumpsites at Abakaliki mechanical sites. Four dumpsites were selected based on geographical spread. An Atomic Absorption Spectrophotometer (205 Bulk Scientific Model) was used to analyse the digested soil samples for the selected heavy metal content. The results were compared with the control and the WHO permissible limits of heavy metals that should be found in the environment. Mean concentrations of Cd were in the range of 5.43±0.22 - 8.27±0.25 mg/Kg, Cr 6.46±0.27 - 9.41±0.18 mg/Kg, Cu 10.34±0.30 – 16.41±0.26 mg/Kg, Pb 20.49±0.30 – 45.72±0.00 mg/Kg, Mn 4.21±0.17 – 6.77±0.10 mg/Kg, Fe 24.50±0.24 – 30.25±0.32 mg/Kg, As 1.65±0.11 – 7.24±0.12 mg/Kg, Zn 19.45±0.13 – 24.61±0.10 mg/Kg. The results from all the locations were higher than the controls and World Health Organization (WHO) guidelines indicating a clear case of high levels of pollution. The heavy metal pollution may be due to waste from welding activities, forging and foundry activities, battery repairs, fuel and oil handling, painting and coatings done in these sites. With this level of heavy metal pollution, the environment will be threatened as these heavy metals can be eroded and washed into the water environment, making the water unfit for human consumption. Drastic Public enlightenment campaigns on waste disposal and its effects with comprehensive legislation are recommended. This research will expose the danger and effects of heavy metals in dumpsites to the occupant of such environment. It will also form a baseline of the environmental effects of indiscriminate dumping of refuse.