Environmental implication of metal concentrations in soil, plant foods and pond in area around the derelict udege mines of Nasarawa State, Nigeria

Abstract

Levels of sodium, potassium, nickel, copper, magnesium, iron, calcium, zinc, lead, cadmium, arsenic, selenium, chromium, manganese and tin were determined in soil, plant foods and pond located in Udege abandoned tin/columbite mining area of Nasarawa State, Nigeria. The mean concentration values of Na, K, Ni, Cu, Mg, Fe, Ca, Zn, Pb, Cd, As, Se, Cr, Mn and Sn in the soils were: 10.69, 9.94, 0.04, 0.34, 4.55, 256.33, 209.89, 1.02, 0.20, 1.60, 1.19, 5.03, 46.79 and 1.03 mgkg-1 dry weight, respectively, while Cd was not at detectable range of atomic absorption spectrophotometer. Most metals from the soil were more highly concentrated than the corresponding values in the plant foods harvested in the same soil; samples showed evidence of bioaccumulation. Metal values of the plant foods harvested in the mining area and the ones harvested in non-mining area (control) fall within acceptable range. However, some toxic trace metals in the water sample from the pond were found to have contained concentrations above the permissible safe level. This pond should not be used as a source of potable water and other domestic purposes in the area. © 2010 Chemical Society of Ethiopia.