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Study of spectrophotometric method for determination of trace copper after the separation and enrichment with solid phase extractant-microcrystalline phenolphthalein

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Chinese Science Bulletin

Abstract

A new method of using phenolphthalein loaded with 1-(2-pyridylazo)-2-naphthol (PAN) as solid phase extractant to separate and enrich trace copper in diverse water samples has been developed. The effects of different parameters, such as the amounts of PAN and phenolphthalein, stirring time, various salts and metal ions on the enrichment yield of Cu(II) have been investigated to select the experimental conditions. Under the optimum conditions, Cu(II) can be totally adsorbed on the surface of microcrystalline phenolphthalein. By controlling appropriate acidity (pH=1.0), Cu(II) is completely separated from Cd(II), Pb(II), Mn(II), Co(II), Fe(III), Ni(II), Al(III), Zn(II) and Hg(II) in the solution. The possible reaction mechanism of the enrichment of copper is discussed in detail in this paper. The detection limit of this proposed method is found to be 0.03 μg·L−1 with the enrichment factor of 200. The recovery is in a range of 96.8%–105%. The standard deviation is less than 2.5%. The proposed method has been successfully applied to the determination of trace copper in different water samples with satisfactory results.

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Authors and Affiliations

  1. The Key Laboratory of Environmental Pollution Control Technology of Henan Province, College of Chemistry and Environmental Science, Henan Normal University, Xinxiang, 453007, China

    Li QuanMin, Zhao XiaoHong, Jiang Kai & Liu GuoGuang

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  1. Li QuanMin
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  2. Zhao XiaoHong
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  3. Jiang Kai
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  4. Liu GuoGuang
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Correspondence to Li QuanMin.

Additional information

Supported by the Natural Science Foundation of Henan Province (Grant No. 0511020500) and Innovation Project Foundation of University in Henan Province (Grant No. [2001]513)

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Li, Q., Zhao, X., Jiang, K. et al. Study of spectrophotometric method for determination of trace copper after the separation and enrichment with solid phase extractant-microcrystalline phenolphthalein. CHINESE SCI BULL 52, 65–70 (2007). https://doi.org/10.1007/s11434-007-0018-2

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  • DOI: https://doi.org/10.1007/s11434-007-0018-2

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