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V. C. Srivastava, I. D. Mall and I. M. Mishra, “Adsorption Thermodynamics and Isosteric Heat of Adsorption of Toxic Metal Ions onto Bagasse ?y Ash (BFA) and Rice Husk Ash (RHA),” Chemical Engineering Journal, Vol. 132, No. 1-3, 2007, pp. 267-278. doi:10.1016/j.cej.2007.01.007

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• TITLE: Preconcentration of Germanium(IV) on Styrene-Maleic Anhydride Copolymer Modified with Aminobenzoic Acids and Its Spectrophotometric Determination with Bis(2,3,4-trihydroxyphenylazo)benzidine

  AUTHORS: Kamran T. Mahmudov, Rafiga A. Aliyeva, Sahil Z. Hamidov, Famil M. Chyragov, Samira R. Mardanova, Maximilian N. Kopylovich, Armando J. L. Pombeiro

  KEYWORDS: Germanium(IV); Preconcentration; Sorption; Spectrophotometric Determination

  JOURNAL NAME: American Journal of Analytical Chemistry, Vol.3 No.12, December 25, 2012

  ABSTRACT: The styrene-maleic anhydride copolymer was chemically modi?ed, in the presence of formaldehyde, with 4-amino-2-hydroxybenzoic acid or 4-aminobenzoic acid giving sorbents S1 and S2, respectively. The specific sorption behaviour of S1 and S2 towards germanium(IV) was examined and optimized, the preconcentrated germanium(IV) after desorption being spectrophotometrically quantified with bis(2,3,4-trihydroxyphenylazo)benzidine in the presence of hexamethylenetetramine, phenanthroline and 2,2’-bipyridine. The dynamic sorption capacity and detection limits (3σ, n = 17) of germanium were found to be 152.2 and 127.1 mg·g–1, and 0.9 and 1.1 ng·mL–1, for S1 and S2, accordingly. The application of S1 and S2 was demonstrated for the selective preconcentration/determination of germanium in seawater and water obtained after oil pumping.