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Abstract
A new method for selective extraction and spectrophotometric determination of micro-gram amount of chromium(VI) with N-hydroxy-N,N′-diphenylbenzamidine (HOA) and N-aryl-acetamides (HL) in coal dust, coal ash, cement dust and industrial waste water is described. It is based on chloroform extraction of [CrO2.(OA)2] 2HL complex from 0.3–0.6 M hydrochloric acid solution. The molar absorptivity of [CrO2.(OA)2] complex, with three different amides in chloroform, lies in the range of (1.1–1.3) × 1041.mole−1cm−1 at λmax, and of these, the simplest amide, N-phenylacetamide (PAA) has been selected for the detailed studies. The detection limit of the method is 0.01μg Cr/ml. The relative standard deviation of the method for the recovery of the metal in the environmental samples is found to be in the range of ±0.8 to 1.3%. The effect of diverse ions on the determination of the metal were examined. Most of the common metals except Mn(VII) were not found to interfere.