IMMOBILIZATION OF ARSENIC IN SOIL FROM WOOD TREATMENT FACTORY USING WOODASH AND BENTONITE AS ADDITIVES

J. M. Okuo, D. E. Ogbeifun, Z. O. Musa

Abstract


The soil from the vicinity of wood treatment factory poses great health risk for the surrounding environment due to water erosion into surface water such as rivers and streams, percolation to underground waterbed or by redeposition and re-suspension of soil by strong winds.  Soil samples collected from the vicinity of the wood treatment factory in Ekhenwa, Benin City, were amended with wood ash and bentonite.  The samples were then fractionated using standard methods.  Arsenic was found to be mostly associated with the residual fractions in both soils amended with ash and bentonite. The level of arsenic was found to be highest for the exchangeable fractions of the control.  Generally, there was decrease in the level of arsenic obtained from the various fractions of the amended soil particularly in the bioavailable fractions as compared to the control.

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