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Journal of Analytical Chemistry

, Volume 57, Issue 11, pp 1049–1054 | Cite as

Flow-Injection Determination of Gold(III) Based on Its Catalytic Effect on the Peroxodisulfate Oxidation of Bromopyrogallol Red

  • L. K. Shpigun
  • P. M. Kamilova
  • Ya. V. Shushenachev
Article

Abstract

It was found by derivative spectrophotometry that gold(III) ions exhibit a significant catalytic effect on the peroxodisulfate oxidation of Bromopyrogallol Red in slightly acidic chloride–citrate solutions. It was shown that if this catalytic reaction is implemented in a three-channel flow-injection system, the intensity of the signal due to a decrease in the reagent color is proportional to the concentration of gold(III) in the injected solution and depends on the reagent concentrations, pH, and the temperature of the solution as well as on the sample volume, flow rates, and the length of the reaction coil. The conditions assuring the kinetic masking of foreign ions in the injected solution were found. The possibilities of the flow-injection determination of 0.004–1.00 μg/mL gold(III) in the presence of copper, iron, and many other concomitant elements were found. The average throughput of the analytical system is 200 h–1 for a sample volume of 500 μL. The performance characteristics of the procedure were estimated in the analysis of synthetic mixtures simulating the rinsing waters of gilding baths.

Keywords

Sample Volume Spectrophotometry Catalytic Reaction Catalytic Effect Acidic Chloride 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© MAIK “Nauka/Interperiodica” 2002

Authors and Affiliations

  • L. K. Shpigun
    • 1
  • P. M. Kamilova
    • 1
  • Ya. V. Shushenachev
    • 1
  1. 1.Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of SciencesMoscowRussia

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