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Water samples from boreholes near abattoirs in Iwofe, Agip (Ayagologo) and Mile III were collected and assessed for some physicochemical parameters and heavy metals. The physicochemical parameters were analysed using American Public Health Association (APHA) standard methods, while the heavy metals were analysed using atomic absorption spectrophotometer (AAS). The results indicated that all the physicochemical parameters measured in all the stations except pH at Agip station which was 5.50±1.76 a were all within the WHO and SON permissible limits of 6.5-8.5. The heavy metals analysed showed that copper (Cu), Iron (Fe), lead (Pb) and Chromium (Cr) (Iwofe and Agip) were below WHO and SON permissible limit for drinking water. Cadmium (Cd) was not detected in any of the samples. The other metals examined were all above the standard limits prescribed by these organisations for drinking water. Zinc (Zn) (3.379±0.01 -6.599±0.04 Original Research Articleml/L) range was higher than the WHO and SON upper limit of 3.0 ml/L. Manganese (Mn) values which ranged from 0.049±0.01-0.054±0.01 in the station were above the WHO limit of 0.4 ml/L and SON limit of 0.2 mg/L. Nickel (Ni) ranged between 0.012±0.00 -0.047±0.00 ml/L and the stations, which were higher than the acceptable limit of 0.02 mg/L by WHO and SON. Arsenic (As) was 0.15±0.00 -0.37±0.04 mg/L range in the stations which was higher than the maximum requirement of 0.01 mg/L by WHO and SON. The result showed that the metal concentrations were generally in the order; Zn > Co > As > Mn > Cu > Cr > Ni > Pb > Fe > Cd in the stations examined. The implication of the results obtained is that the water from these boreholes sited within the vicinity of these abattoirs, are not suitable for human and animal consumption and also for the treatment of the meat during processing.

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ABSTRACT:The variation of some heavy metals Cd, Ni, Cu and Pb was conducted on sediment, cat fish and water samples from four stations in Ipo stream in dry and wet seasons. Atomic Absorption Spectrophotometry model 3700 was used to analyzed the samples The result revealed that the average metal concentrations in sediment in both seasons was in the order Pb > Cu >Ni > Cd which were 25.73µg/g, 18.48µg/g, 2.91µg/g and 1.35µg/g respectively. In fish sample the metals also occurred in the order Pb ,Cu , Ni and Cd which were 24.14µg/g ,17.85µg/g, 2.79µg/g and1.15µg/g respectively, while in the water sample similar trend of heavy metals concentrations also occurred which were 23.32µg/l for Pb,17.32µg/l for Cu, 2.42µg/l Ni and1.15µg/l for Cd respectively. These values were below the established standard for aquatic environment by W.H.O and FAO. The result indicated that the consumer of fish and water from the stream is not at risk of being poison by these metals. @ JASEM

The concentrations of Cd, Ni, Cu, Pb and Fe were determined in sediments and water samples of two aquatic systems after mineralization with HNO3, HCl and HClO4 and analyzed using Atomic Absorption Spectrophotometer model 507KL. The mean concentration obtained in sediments of Ipo stream were as follows Cd (