Effects of aluminium extrusion effluents on the aquatic life of Mba River, Imo State: implications for fishery resource use and management
2007
Njoku, D.C. | Igwe, O.O.
Water quality status of Mbaa River, which receives effluents from aluminum extrusionindustries at Inyishi Imo State, was investigated between November 2004 and April 2005.Concentration of toxic metals and non metallic radicals in the stream (Fe, Zn, Cr,AI, Pb, Cd,So42, PH, etc) were evaluated as indices, using the atomic absorption spectrophotometerand other standard methods. The concentration of iron (Fe) ranged from 0.003mgl-l in theupstream course to 22.966mgl-1 at the point of discharge. Lead (Pb) was 0.29mgl-l(upstream) to 0.583mgl-l (point of discharge). Cadmium (Cd), 0.026mgl-1 (downstream) toO.068mgl-l (discharge point). Aluminum, (AI), 6.24mgl-1 (upstream) to 8.256mgl-1(discharge point), sot, 9.003mgl-1 (downstream) to 37.293 mgl_1 (discharge point). PH,4.806(upstream) to•2.503 (point of discharge). Values recorded were then compared withthe internationally recommended maximum permissible levels for aquatic life. Most of theelements, particularly the heavy metals (Pb, Cd, Cr, and AI) were all significantly higher(P<0.05) than the recommended permissible safe levels. The implication of this on health,income and socio-economic life of resources users were discussed.
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