Studies on the polarographic adsorptive catalytic wave of germanium - alizarin red - VOSO4 - edta system

Abstract

In a supporting electrolyte containing 6 ?10-4 mol dm-3 Alizarin Red (AR), 0.5 mol dm-3 ClCH2CO2H-ClCH2CO2Na, 0.8 mol dm-3 NH4Cl, and 0.012 mol dm-3 VOSO4 and EDTA, at pH 2.2, an adsorption catalytic wave of Ge was obtained by single-sweep polarog. at 0.6 V. The peak height is linearly proportional to the concentration of Ge in the range 3.0 ?10-9-6.0 ?10-6 mol dm-3. The detection limit is 1.0 ?10-9 mol dm-3. The electrode processes of the adsorption catalytic wave of the 1:1 Ge-AR complex are discussed. The rate constant was determine as 6.6 ?106 (mol.dm-3)-2 s-1.

Key words: REACTION MECHANISM, ADSORPTION, POLAROGRAPHIC ANALYSIS, EDTA, SULFATE, GERMANIUM, CATALYTIC WAVE, COMPLEX CATALYSIS, REACTION RATE, VANADIUM COMPOUNDS

CLC Number:

O651

Cite this article

LI NANQIANG;CUI YI;HE HONGBING. Studies on the polarographic adsorptive catalytic wave of germanium - alizarin red - VOSO4 - edta system[J]. Acta Chimica Sinica, 1987, 45(4): 399-402.

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锗(IV)-茜素红-VOSO4-EDTA体系极谱吸附催化波研究