SPECTROPHOTOMETRIC DETERMINATION OF PALLADIUM AND BISMUTH(III) WITH SEMIMETHYLXYLENOL BLUE.

Abstract

Procedures are described for the spectrophotometric determination of palladium and bismuth(III) with Semimethylxylenol Blue (SMXB). SMXB reacts with palladium and bismuth(III) to form reddish-violet 1:1 complexes. The optimum pH ranges for the color development are pH 1. 0-1. 7 for palladium and pH 1. 0-1. 4 for bismuth(III) The absorption maxima of the colored solutions lie at 565-568 nm and at 568-570 nm, respectively. Beer's law is obeyed over the range of 0. 4-3. 2 mu g cm** minus **3 of palladium and 0. 4-4. 0 mu g cm** minus **3 of bismuth(III), and the sensitivities of the determinations are 4. 0 multiplied by 10** minus **3 mu g Pd cm** minus **2 and 6. 1 multiplied by 10** minus **3 mu g Bi cm** minus **2 for 0. 001 of absorbance. For the palladium determination, gallium, tin(IV), bismuth(III), scandium, zirconium, and iron(III) interfere, but tin(IV), scandium, zirconium, and iron(III) can be masked by the addition of fluoride.