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Metal concentration in cocoa seeds shell ash, liquid effluent, soil sediments and associated plants in a cocoa processing industry in Nigeria

Levels of iron, zinc, manganese, copper, tin, aluminium, magnesium, sodium, potassium, lead, arsenic, chromium, cadmium, titanium and calcium were determined in cocoa seeds shell ash, liquid effluent, soil sediments and associated plants (kokoyam and cassava parts) using an atomic absorption spectrophotometer from a cocoa processing industry located at Akure along the Akure–Owo express road, Ondo State, Nigeria. The soil sediments metals were more highly concentrated than the corresponding values in the liquid effluent; both samples showed evidence of metal bioaccumulation. The toxic trace metals determined were mostly above the permissible safe levels. Plants should not be planted along the effluent channel to avoid plant bioaccumulation of toxic metals.