title: Adsorptive stripping measurements of germanium(IV) in the presence of pyrogallol.
abstract: The adsorptive stripping voltammetric determination of germanium(IV) based on the adsorptive accumulation of the germanium(IV)-pyrogallol complex on a hanging mercury drop electrode is reported. The reduction current of the adsorbed germanium complex is measured by differential-pulse cathodic stripping voltammetry. The peak potential is at -0.42 V vs. Ag AgCl (saturated KCL). The effects of various parameters (ligand concentration, supporting electrolytic composition and concentration, accumulation potential and collection time) on the response are discussed. With controlled accumulation for 3 min, the detection limit is 1.2 x 10(-9) M germanium. The relative standard deviation (at 1.2 x 10(-8) M germanium) is 3.6%. Possible interferences are evaluated. The applicability of the method to the determination of germanium(IV) in ore samples was also successfully carried out.
authors.affiliation: Department of Chemistry, Jilin University, Changchun, 130023, People's Republic of China.
authors.forename: C
authors.initials: C
authors.lastname: Sun
authors.forename: Q
authors.initials: Q
authors.lastname: Gao
authors.forename: L
authors.initials: L
authors.lastname: Liu