Copper(II)-cetyltrimethylammonium chloride-chromal blue G ternary complex and its application to the spectrophotometric determination of copper(II) |
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Authors: | Katsuya Uesugi Mitsuo Miyawaki Tohru Nagahiro |
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Institution: | Laboratory of Chemistry, Himeji Institute of Technology, Shosha, Himeji, Hyogo, 671-22, Japan |
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Abstract: | A sensitive spectrophotometric method for the determination of copper(II) based on a ternary complex with chromal blue G, a triphenylmethane reagent in the presence of cetyltrimethylammonium chloride, is described. The sensitivity of color reaction between copper and chromal blue G has been greatly increased by the sensitizing action of cetyltrimethylammonium chloride, a cationic surfactant. The color development of the ternary complex can be utilized in the highly sensitive spectrophotometric determination of copper. The molar absorptivity of the binary complex between copper and chromal blue G ε630nm = 9.56 × 103liters · mol−1 · cm−1 is enchanced on ternary complex formation to ε542 nm = 4.78 × 104liters · mol−1 · cm−1. The ternary complex gave a maximal absorbance at 542 nm in the pH range 9.8–11. Beer's law is obeyed up to at least 1.2 ppm of copper. The maximal absorbance of the ternary complex was found to develop within 5 min and then it remains constant for several hours. The formation constant of the ternary complex is calculated to be 8.6 × 1010 under these conditions. |
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Keywords: | To whom all correspondence should be addressed Present address: Department of Analytical Chemistry Faculty of Sciences University of Cadiz Spain |
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