Solvent Extraction of Chromium and Cadmium from Contaminated Soil.
Kapil Kumar Rana (T.E Chemical,
Abstract:
The contaminants were selectively extracted by contacting the soil with the carrier solvent in which the appropriate chelating agents had been dissolved. The main thing was the use of an environmentally acceptable water soluble carrier solvent such as ethanol, showing that the carrier solvents themselves do not have to be good solvents of the contaminants .In fact, their main purpose is to carry with them appropriate chelating agents that, being soluble in the solvent mixture, can first penetrate the pores in the soil and then form complexes with contaminants that thereby can be washed out of the soil. Soils contaminated with chromium and cadmium can be remediated first by wetting them with water and then washing them with a 99% water and 1% ethanol solution which contains an appropriate chelators, namely diphenylcarbazide for chromium and 1,5- diphenylthiocarbazone for cadmium with a 5-to-1 molar ratio between chelates and metal.
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