On-Line Preconcentration and Speciation of Chromium by an 8-Hydroxyquinoline Microcolumn Immobilized on Surfactant-Coated Alumina and Flow Injection Atomic Absorption Spectrometry

Authors : Seyyed Hamid AHMADI, Ali Mohammad Haji SHABANI

Pages : 191-199

View : 18 | Download : 10

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :An on-line technique for the determination of chromium species with atomic absorption spectrometry is described. The method is based on separation and preconcentration of Crinsert ignore into journalissuearticles values(III); on a microcolumn of immobilized 8-hydroxyquinoline on surfactant-coated alumina. The adsorbed analyte is then eluted with 400 m L of 20% ethanolic solution of 1.5 mol L-1 hydrochloric acid and is transported to a flame atomic absorption spectrometer for quantification. The effects of pH, sample and eluent flow rate, sorption capacity, and the presence of various cations and anions on the sorption of Crinsert ignore into journalissuearticles values(III); were investigated. The sorption was quantitative in the pH 6-8 range, and for a sample volume of 35 mL a preconcentration factor of 98 was obtained. Total chromium was determined by efficient reduction of Crinsert ignore into journalissuearticles values(VI); to Crinsert ignore into journalissuearticles values(III); with hydroxylamine. The method was applied to the determination of chromium in electroplating wastewater samples.
Keywords : Chromium speciation, on line preconcentration, 8 hydroxyquinoline, alumina, flow injection