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Abstract
The concentrations of Iron (Fe), Lead (Pb), Cadmium (Cd), Chromium (Cr), Nickel (Ni) and Manganese (Mn) in water and five random fish species obtained from Langtang-North dams, were investigated by atomic absorption spectrophotometry. The pattern of distribution of the metals showed a preponderance of Fe over other metals in each of the dams. Cr, Pb, and Ni were not detected in water and fish samples. The mean concentrations of Cd, Fe and Mn in water were significantly different from that of the fishes. The mean concentrations of the heavy metals in the big dam for Cd, Fe, and Mn in water are 0.101, 0.392 and 0.0252mg/kg respectively while 0.121, 1.302 and 0.211 mg/kg of Cd, Fe and Mn were present in the fish samples. For the small dam, 0.093, .464 and 0.310mg/kg for Cd, Fe and Mn were obtained from the water samples while 0.114, 1.405 and 0.314mg/kg for Cd, Fe and Mn were obtained from the fish samples. All the detected heavy metals concentration were found to be below the world health organization standard (WHO).
