Author(s)

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

Centro de Química Estrutural, Complexo I, Instituto Superior Técnico, Technical University of Lisbon, Lisbon, Portugal.
Department of Chemistry, Baku State University, Baku, Azerbaijan.

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.

Germanium(IV); Preconcentration; Sorption; Spectrophotometric Determination

K. Mahmudov, R. Aliyeva, S. Hamidov, F. Chyragov, S. Mardanova, M. Kopylovich and A. Pombeiro, "Preconcentration of Germanium(IV) on Styrene-Maleic Anhydride Copolymer Modified with Aminobenzoic Acids and Its Spectrophotometric Determination with Bis(2,3,4-trihydroxyphenylazo)benzidine," American Journal of Analytical Chemistry, Vol. 3 No. 12, 2012, pp. 790-799. doi: 10.4236/ajac.2012.312105.