Adsorptive stripping voltammetric behavior of gold(III) at a hanging mercury drop electrode in the presence of 1-(2′-pyridylazo)−2-naphthol
✍ Scribed by A.Z. Abu Zuhri; M.S. El-Shahawi; M.M. Kamal
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 448 KB
- Volume
- 282
- Category
- Article
- ISSN
- 0003-2670
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✦ Synopsis
The stripping voltammetric determination of gold(III1 based on the adsorptive accumulation of the Au(III)-142'pyridylaxo)_2-naphthol complex on a hanging mercury drop electrode is reported. The reduction current of the adsorbed gold complex ions is measured by differential-pulse cathodic stripping voltammetty. The peak potential is at -0.8 V vs. Ag/AgCl. The effects of various parameters (pH, ligand concentration, accumulation potential and collection time) on the response in the presence of ethanol-water (30%, v/v> and 0.5 M sodium sulphate are discussed. A linear response up to 5.0 X 10-s M and a relative standard deviation of 2.9% at 3.0 X lo-M were obtained. The W-visible spectrum of the complex formed was also measured. The applicability of the method to the determination of gold(I) and mixtures of gold(I) and (III) compounds was also successfully carried out. Possible interferences by trace metals on the proposed method were examined.