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《Chinese Journal of Analytieal Chemistry》 2001-04
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Simultaneous Spectrophotometric Determination of Zinc, Cadmium and Mercury with Hybrid Linear Analysis

Wang Xiaojia, Wang Baoning (Changchun Institute of Applied Chemistry ,Chinese Academy of Sciences, Changchun 130022)  
A new method for simultaneous spectrophotometric determination of Zn, Cd and Hg using 2-(5-Br-2-pyridylazo)-5-diethylaminophenol as the color developing reagent was proposed. The absorption spectra of these three complexes have similar features with severe overlap in visible spectral range. For resolving these spectra, hybrid linear analysis was used, and the pure spectrum of each component was obtained from the calibration mixtures by least squares method. The effects of reaction condition, selection of wavelengths, determination of pure spectrum and additivity of absorbances etc. on the determination were discussed. The proposed method offers the advantages of simple, rapid, and accuracy. It has been successfully applied to the simultaneous determination of Zn, Cd and Hg in synthetic sample. A comparison was also made with the partial least squares method.
【CateGory Index】: O657.3
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