Investigation of the Reaction of Gold(III) with 2‐[2‐(4‐Dimethylamino‐Phenyl)‐Vinyl]‐1,3,3‐Trimethyl‐3H‐Indolium. Application for Determination of Gold |
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| Authors: | Rastislav Serbin Yaroslav R Bazel Marcel Torok Josef Havel Ioseph S Balogh Zholt O Kormosh Gabriela Holéczyová Vasil Andruch |
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| Institution: | 1. Department of Analytical Chemistry, P.J. ?afárik University in Ko?ice, Moyzesova 11, SK‐04154 Ko?ice, Slovakia;2. Department of Chemistry, Masaiyk University in Brno, Kotlá?ská 2, CZ‐611 37 Brno, Czech Republic;3. Department of Chemistry, College of Nyíregyháza, Sóstói u. 31/B, 4400 Nyíregyháza, Hungary;4. Department of Analytical Chemistry, Volyn National University, Voliav., 13, 43025 Lutsk, Ukraine |
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| Abstract: | A new, simple, rapid, sensitive, efficient and low‐cost spectrophotometric procedure for the determination of gold was developed. The method is based on the reaction of AuCl4]? with 2‐2‐(4‐dimethylaminophenyl)‐vinyl]‐1,3,3‐trimethyl‐3H‐indolium reagent to form a colored ion associate extractable by various organic solvents. The molar absorptivity of the ion associates is in the range (5.7–9.2) × 104 L mol?1 cm?1 depending on the extractant. Butyl acetate was chosen as the extractant. The optimum reaction conditions were established: pH 2–4, concentration of the dye reagent (0.8–1.5) × 10?4 mol L?1. The determination of gold is not hindered even by a 1000‐fold concentration of Ni and Co; a 500‐fold concentration of Pb and Zn; a 100‐fold concentration of Bi, Cu, Cd, Pt, Rh and Ru; or a 20‐fold concentration of Ag. The established method was applied to the determination of gold in model samples and enriched polymetallic ores. |
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| Keywords: | 2‐[2‐(4‐Dimethylamino‐phenyl)‐vinyl]‐1 3 3‐trimethyl‐3H‐indolium Gold Spectrophotometry |
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