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Citation: WU Hong-Wei, LI Quan-Min, LIU Guo-Guang. Concentration and Separation of Cadmium with Microcrystalline Phenolphthalein Modified by Ethyl Violet[J]. Chinese Journal of Applied Chemistry, ;2006, 23(6): 607-611. shu

Concentration and Separation of Cadmium with Microcrystalline Phenolphthalein Modified by Ethyl Violet

1.
College of Chemistry and Environmental Science, Key Laboratory of Environmental Science and Engineering, Education Commission of Henan Province, Henan Normal University, Xinxiang 453007

Corresponding author: LI Quan-Min,
Received Date: 30 July 2005
Available Online: 30 January 2006
Fund Project: 河南省自然科学基金(0511020500) (0511020500)河南省创新人才工程项目(教高[2001]513号)资助项目 (教高[2001]513号)

With the presence of KI,Cd(Ⅱ) can react with I^- to form metal complex anions CdI₃^- and CdI₄^2- at pH 1.0~6.0,which can be well adsorbed on microcrystalline phenolphthalein modified by ethyl violet.Cd(Ⅱ) can be completely separated from Zn(Ⅱ),Fe(Ⅱ),Co(Ⅱ),Ni(Ⅱ),Mn(Ⅱ),Cr(Ⅲ) and Al(Ⅲ) under optimized conditions.This method was successfully applied to the concentration and determination of trace cadmium in environmental aqueous samples.The preconcentration factor can reach 100~200 times.Cadmium in natural water samples was concentrated prior to determination by FAAS.The recovery is above 96%.The detection limit is 0.018 μg/L.
- microcrystalline phenolphthalein,
- ethyl violet,
- separation and concentration,
- cadmium
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