Publisher: Chemical Society of Nigeria

Decontamination of Copper, Chromium and Arsenic From Chromated Copper Arsenate (CCA) Contaminated Soil

E. G. Uwumarongie - Ilori, F. E. Okieimen
KEYWORDS: Chelating agents, Citric acid, EDTA, CCA

ABSTRACT:

Heavy metal contamination of soil is a common problem encountered at many hazardous sites. Lead, cadmium, chromium, copper, zinc, mercury and arsenic are among the most frequently observed metal contaminants. Once released into the soil matrix, most heavy metals are strongly retained and their adverse effects can last for a long time. The technology of soil washing has been used to remove metals from the solid matrix to a liquid phase. n this study, modified Tessier’s sequential extraction scheme was used in the chemical fraction process and to ascertain the redistribution of the metals. After the extraction process, 62% and 45% As, 84% and 45% Cr and 92% and 53% Cu were extracted from the CCA contaminated soil by EDTA and citric acid respectively. After the chelant extraction, the metal content became more bioavailable thereby favouring the application of phytoremediation technology.


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