Abstract
Abstract A laboratory study was conducted to evaluate three different chemical methods in extracting Cd, Cr, Ni and Pb of soils with wide range in their properties. The methods studied were aqua regia, 0.5 N HNO3 and acid ammonium acetate-EDTA, pH 4.65 (AAAc-EDTA). The mean values of Cd, Cr, Ni and Pb extracted by aqua regia were 0.22, 53.2, 35.4 and 23.9 mg/kg. The 0.5 N HNO3 extracted of the aqua regia extractable cadmium on an average 77%, of lead 54%, of nickel 8% and of chromium 3%. The respective percentages in case of the AAAc-EDTA extraction were 64% for cadmium, 34% for lead, 4.5% for nickel and 0.26% for chromium. Highest percentage of cadmium and lead were extracted of soils where the aqua regia extractable contents were highest. This may be considered as an indication that 0.5 N HNO3 and AAAc-EDTA could be successfully used in pollution studies.
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