Spectrophotometric determination of scandium(III) in monazite after separation using Amberlite IRC 718 chelating resin

The spectrophotometric determination method of scandium with eriochrome cya nine R (ECR) and the composition ratio of the complex were investigated in the presence of surfactants. A volume of 5 mL of 1.0x10(-3) M ECR and 10 mL of 2.0x10(-4) M CTMAB are necessary for the determination of 1.0x10(-7) si milar to 3.0x10(-6) M Sc(III) at pH 6.5. The apparent molar absorption coef ficient of the Sc(III)-ECR-CTMAB, ternary complex at 610 nm is 5.6x10(5) mo l(-1) cm(-1) L and its detection limit is 1.0x10(-7) M. Separation studies were conducted by the column method. The effect of pH, elution solution and the influence of rare earth elements as interferents was discussed. Their separation was carried out in 0.1 M HCl-50% methanol solution and 1.0 M HCl media. The method was applied for the determination of Sc(III) in monazite .