Studies on electroanalytical chemistry of rare earth elements X: Single-sweep polarographic investigation of adsorptive complex wave of gadolinium-alizarin red S.

Abstract

In a supporting electrolyte containing 2X10-4M Alizarin Red S, 0.1M NH3-NH4Cl and at pH 9.6, we obtained an adsorptive complex wave of gadolinium-Alizarin Bed S by single-sweep polarography. The peak potential of the derivative wave is -0.69V (S. C. E.). The limit of detection for gadolinium is 6X10-8M. We have determined the composition of the complex which is 1:3 GD-Alizarin Red S and confirmed that the wave is an adsorptive complex wave. The electrode processes may be presented as follows: Gd3+ + 3HL2- + 3NH3 = (GdL3)6- + 3(NH4)^+ (Chemical reaction) (GdL3)6- = (GdL3)ad6- (Surface process) The total electrochemical reaction is (GdL3)ad6- + 6e + 6(NH4)^+ = (Gd(LH2)3)ad6- + 6NH3

Key words: OSCILLOSCOPIC POLAROGRAPHY, ADSORPTION, POLAROGRAPHIC ANALYSIS, RARE ELEMENT, ELECTROCHEMICAL ANALYSIS, GADOLINIUM COMPLEX, ALIZARINE RED

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LI NANQIANG;ZHANG LI;GAO XIAOXIA. Studies on electroanalytical chemistry of rare earth elements X: Single-sweep polarographic investigation of adsorptive complex wave of gadolinium-alizarin red S.[J]. Acta Chimica Sinica, 1983, 41(4): 351-358.

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