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Citation: LI Quan-Min, WU Hong-Wei, LIU Guo-Guang. Determination of Trace Vanadium in Nature Water Samples with Spectrophotometry After Separation/Preconcentration on Microcrystalline Phenolphthalein Modified by Ethyl Violet[J]. Chinese Journal of Applied Chemistry, ;2007, 24(9): 1036-1040. shu

Determination of Trace Vanadium in Nature Water Samples with Spectrophotometry After Separation/Preconcentration on 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: 9 October 2006
Available Online: 26 January 2007
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)资助项目 (教高[2001]513)

The paper presents a novel method for the separation and preconcentration of vanadium with microcrystalline phenolphthalein as the sorbent. Experiments indicated that vanadium existed in the main form of V₃O₉^3- at pH 3.7~7.0, and vanadium reacted with Ethyl Violet(EV⁺) to form an ion-association complex (V₃O₉^3-)·(EV⁺)₃ which was quantificationally adsorbed on the surface of microcrystalline phenolphthalein. At the same time, vanadium(V) was completely separated from Co(Ⅱ), Ni(Ⅱ), Zn(Ⅱ), Cd(Ⅱ), Al(Ⅲ), Cu(Ⅱ), Hg(Ⅱ), Pb(Ⅱ), Mn(Ⅱ), Fe(Ⅲ), Cr(Ⅲ) and hardly affected by SO₄^2-, NO₃^-, Br^-, Cl^-, I^-, ClO₄^-. After 5.00 mL of 1.0×10^-3 mol/L EV⁺, 1.00 mL of 0.10 mol/L HCl(the pH of the solution was adjusted to about 4.0) and 5.00 mL of 15.8% phenolphthalein solution were added in 1.0 L environmental water sample, the mixture was stirred for 50 min, and trace vanadium(Ⅴ) can be completely enriched in the process of stirring. The preconcentration factor can reach 100~200. The recovery of V(Ⅴ) is beyond 98.0%. The relative standard deviation RSD is 1.1%~2.3%. The method is simple and the result of determination of trace vanadium is satisfactory.
- vanadium,
- ethyl violet,
- microcrystalline phenolphthalein,
- separation and preconcentration,
- spectrophotometry
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