Journal
JOURNAL OF THE CHINESE CHEMICAL SOCIETY
Volume 54, Issue 1, Pages 157-164Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/jccs.200700025
Keywords
derivative spectrophotometry; zero-crossing technique; copper; nickel; methylthymol blue; cetyltrimethylammonium bromide
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A second-derivative spectrophotometric method based on zero-crossing over technique is developed in simultaneous determination of copper(II) and nickel(II) ions. Methylthymol blue (MTB) as a chromogenic reagent and cetyltrimethylammonium bromide as a surfactant were used, and measurements were carried out in buffered solution at pH 6 and at a temperature of 25 degrees C. The amplitude of derivative spectra was measured at wavelengths of 631.9 and 587.7 nm for the simultaneous determination of Ni2+ and Cu2+, respectively. Linearity was obtained in the range of 0.5-5.0 mu g mL(-1) for both ions in the presence of 0.0-5.0 mu g mL(-1) of the other ion as an interfering ion. IUPAC detection limits for Cu2+ and Ni2+ ions were obtained at 0.48 and 0.43 mu g mL(-1), respectively. The proposed procedure has been applied successfully for the simultaneous determination of copper and nickel in synthetic binary mixtures and real samples.
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