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ABSTRACT
Municipal solid waste collected in Nigeria are often disposed of in uncontrolled dumpsites and/or burnt in the open spaces and consequently causing significant pollution of surface water, ground water and air. This study assessed the quality of some borehole water sources within the vicinity of Otofure dumpsite.
Fifty four (54) water samples were collected using Grab sampling method(( Metcalf; and Eddy 2003) and analyzed for physico-chemical parameters, The levels of lead (Pb) copper (Cu), chromium (Cr) and cadmium (Cd) were determined using an atomic absorption spectrophotometer (AAS) and the level of the 16 USEPA PAHs in the water samples were determined by gas chromatography – flame ionization detector (GC-FID).
Values recorded for physicochemical parameters (except for pH) were within the World Health Organization (WHO and NIS) limits. The levels of the heavy metals in the study area were found to be in the order: lead(0.20±0.02mg/l)>cadmium (0.10±0.01 mg/l)>copper(0.07±0.01 mg/l)>Zinc(0.02±0.00 mg/l) in the water samples. These values (except for Zinc and copper) were above the WHO and NIS limits. Aside naphthalene being the only PAH detected and had it value recorded (2017.90±0.10 µg/l) in Borehole5 in the month of May 2019 the rest PAHs were all below 0.01 mg/L. The water quality parameters varied across the sampling periods (May, June and July, 2019). Positive relationship between Physiochemical Parameters and Heavy metals were detected.Principal component analysis indicated the predominant source of the pollution load within the sampling area to be from anthropogenic run-off contributing the highest.
