Extractive-spectrophotometric determination of traces of copper(II) with 4-(p-nitrophenylazo)-2-amino-3-pyridinol |
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Authors: | M Salillas P Tarín M Blanco |
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Institution: | Department of Analytical Chemistry, Faculty of Sciences, Autonomous University of Barcelona, Barcelona, Spain |
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Abstract: | A new extractive-spectrophotometric method for determination of copper(II) with 4-(p-nitrophenylazo)-2-amino-3-pyridinol is proposed. The established stoichiometry and extraction constant are 2:1 ligand:metal and ?1.55, respectively. The molar absorptivity of the complex is 5.19 × 104 liters mol?1 cm?1 at 560 nm and Sandell's sensitivity is 1.2 ng cm?2. The best conditions for determination and effect of other ions are studied. The method proposed is applied in the determination of copper in whisky, liver of fish, and seawater. |
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