Abstract
In sodium acetate acid buffer the diffusion currents of palladium and of the reagents bismuthiol 1, bissmuthiol II, 2-mereaptobenzothiazole and 2-mereaptobenzimidazole remain Constant respectively at potentials (vs S.C.E.) of —0.3 to —0.8 V, 0.0 to —0.3 V, 0.0 to —0.8 V, —0.4 to —0.6 V and —0.2 to —0.7 V respectively. Bismuthiol 1, at an applied potential of —0.3V, is effective for the estimation of 1.2 to 2.5 mg of palladium, whereas bismuthiol II and 2-mercaptobenzimidazole give highly satisfactory results with 1.2 to 6.0 mg of palladium at a potential of —0.5 V. 2-Mercaptobenzothiazole at the latter potential gives an error of about 5% when the concentration of palladium is about 6.0 mg.
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