A. L. El-Ansarya, W. F. El-Hawarya,b, A. M. Asranc a-Department of Chemistry, Faculty of Science, Cairo University,.Giza, Egypt. b- Department of Chemistry, Faculty of Science, Taif University,.Taif, KSA. c-Modern Academy for Technology and Engineering, Cairo, Egypt
Summary A spectrophotometric method for determination of iron (III), cobalt (II), copper (II) and vanadium (V) using 6-formyl-7-hydroxy-5-methoxy-2-methyl-8-(2-hydroxy-phenyl-azo) chromone has been studied, the method has been used for the determination of these ions in their binary mixtures. The optimum conditions for the color formation and the stoichiometry of the reaction leading to chelation have been studied. The values of molar absorptivity e (Lmol-1cm-1), specific absorptivity а (Lg-1cm-1) and Sandell sensitivity S (mg cm-2) are determined. The proposed method has been applied for colorimetric determination of iron (III), cobalt (II) and copper (II) in waste water samples. The mixtures have been analyzed using zero crossing measurements technique. |
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