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

Abstract

The styrene-maleic anhydride copolymer was chemically modified, in the presence of formaldehyde, with 4-amino-2-hydroxybenzoic acid or 4-aminobenzoic acid giving sorbents S 1 and S 2 , respectively. The specific sorption behaviour of S 1 and S 2 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 , for S 1 and S 2 , accordingly. The application of S 1 and S 2 was demonstrated for the selective preconcentration/determination of germanium in seawater and water obtained after oil pumping.

Ion-Associated Complex of the Anionic Chelate of Germanium(IV) with Nitro Derivative of the Catechol and the Cation of Monotetrazolium Salt

“…[1][2][3][4][5][6][7][8][9] The colored anionic chelates of Ge(IV) form ion-associated complexes with bulky organic cations, like tetradecyl(trihexyl)phosphonium, methyltrioctylammonium, cetylpyridinium, cetyltrimethylammonium, tetraphenylammonium, tetraphenylarsonium. [10][11][12][13][14][15][16] The structure and the properties of the tetrazolium salts determine their ability to form ion-associated complexes. 17,18 The bulky hydrophobic organic substituents in the molecules of the tetrazolium salts increase the extractability of the ion-associated complexes.…”

Preconcentration–separation of germanium at ultra trace levels on polysulfone membrane filter and its determination by spectrophotometry

“…Trace amounts of germanium at mg L À1 223 levels can be determined accurately. Solid phase extraction on mercapto-modified silica gel hydride generation flame atomic absorption spectrometry 0.813 ng L À1 400 Natural waters [41] Solid phase extraction on N-methylglucamine functional resin inductively coupled plasma atomic emission spectrometry --sulfate solutions [8] Coprecipitation with hafnium hydroxide Electrothermal atomic absorption spectrometry 0.3 mg L À1 -Spring water [46] Solid phase extraction on styrene-maleic anhydride copolymer modified with aminobenzoic acids Spectrophotometry 1.1 mg L À1 -Natural waters [30] Membrane filtration on on polysulfone membrane filter Spectrophotometry 2.1 ng L À1 54 Water and soil samples This work LOD: limit of detection, PF: preconcentration factor.…”