Polarographic and Voltammetric Study of the Sc(III)-Acid Chrome Blue K Complex and Determination of Trace Scandium

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Abstract
A new system of polarographic adsorptive wave for determining trace scandium was proposed. In 0.2 mol/L NH4OAc, the Sc(III)- ACBK [1,8- dihydroxy- 2- (2- hydroxy- 5- sulfo- 1- phenylazo)- 3,6- disulfo- naphthalene, called acid chrome blue K] complex emerged a sensitive adsorptive complex wave(Ep′ = -0.67V). The molar ratio of Sc(III) to ACBK in the complex was established as 1: 2 and the apparent stability constant β2 = 2.7 × 1015. But for Y(III), the molar ratio was 1: 1 and β = 1.5 × 105. Because of the particularity of Sc complex, the sensitivity and the selectivity of determination Sc are much better than that of other rare earth ions. The detection limit is 1.1 × 10−7 mol/L for oscillopolarography and 2.0 × 10−8 mol/L for adsorptive stripping voltammetry.