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15th International Conference on Environmental Chemistry and Engineering

Rome, Italy

Ekeocha I. Christopher

National Mathematical Centre, Nigeria

Title: Ecological Risk Indices Assessment of Heavy Metals Pollution in Soils Selected From Three Auto Mechanic Villages in Abuja, Central Nigeria
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Biography

Biography: Ekeocha I. Christopher

Abstract

 

The research work is targeted at the use of some ecological risk indices models in evaluating the risk associated with heavy metal contamination of soils from selected auto mechanic villages in Abuja, Central Nigeria. The models are Contamination Factor (Cf), Ecological Risk Factor (Er), Degree of Contamination (CD), Pollution Index (PI), Average of Pollution Index (PIAvg), Pollution Load Index (PLI), Nemerow Pollution Index (PINemerow) and Potential Ecological Risk Index (RI). Mean concentrations (mg/kg) of heavy metals in all the sites were found to follow a decreasing order of Apo site:  Cu > Zn > Cr > Fe > Pb > Ni > Cd; Kugbo site: Zn > Cu > Cr > Ni > Fe > Pb > Cd; Zuba site: Zn > Cr > Cu > Fe > Pb > Ni > Cd respectively. Correlation analysis results also reveal that strong correlations exist between heavy metals which probably indicate same origin, mutual dependence and identical behaviors. Results of ecological indices models showed that for PI; 71.24% of heavy metals in Apo and Kugbo sites and 54.14% of heavy metals in Zuba sites were in the class of very strong level of pollution. PIAvg values of 40.93, 12.39 and 7.14 were recorded in Apo, Kugbo and Zuba sites which indicate low quality of sites. PLI values were Apo (8.26), Kugbo (3.99) and Zuba (3.59) which indicate deterioration of site by heavy metals. A trend of decrease in PINemerow values can be deduced as; Apo (153.4)Kugbo (22.3) Zuba (11.3) showing strong level of heavy metal pollution in all the investigated sites. RI values also recorded a decreasing trend of Apo (1590) Kugbo (570) Zuba (517.8) signifying very high to considerable ecological risk to the environment.