Determination of Aluminum Fractionation in Soil Extracts by Using Eriochrome Cyanine R Modified Anion-Exchange Resin as Solid Phase Extraction Cartridge Coupled with ICP-AES

Abstract By using Eriochrome Cyanine R modified anion-exchange resin as solid phase extraction cartridge coupled with ICP-AES, a novel method for the determination of Al fractionation in soil extracts has been developed. The proposed method possesses the following distinct advantages: (1) Good selectivity. The Eriochrome Cyanine R modified resin shows good recognizing ability for Al fractions. The total monomeric Ala can be adsorbed on the modified resin in the pH range of 6 ∼ 10 by column procedure, and the organic monomeric Alo can be determined by batch procedure rapidly while no adsorption of inorganic monomeric Ali was found in 30 min at least. Thus Ali can be obtained by subtraction between Ala and Alo. Major matrix's interference (Fe, Mn and organic substances) in soil extracts can be avoided. (2) Simple manipulation. The modified resin is very easy to prepare just simply by impregnating the resin with a solution containing Eriochrome Cyanine R. This method has been applied to the determination of ...