Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Study on Solid Phase Extraction and Spectrophotometric Determination of Vanadium with 2-(2-Quinolylazo)-5-Diethylaminophenol

  • Hu, Qiu-Fen (Department of Chemistry, Yunnan University, Department of Chemistry, Yuxi Teacher's College) ;
  • Yang, Guan-Gyu (Department of Chemistry, Yunnan University) ;
  • Huang, Zhang-Jie (Department of Chemistry, Yunnan University) ;
  • Yin, Jia-Yuan (Department of Chemistry, Yunnan University)
  • Published : 2004.02.20
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Abstract

A sensitive, selective and rapid method has been developed for the determination ${\mu}$g/L level of vanadium ion based on the rapid reaction of vanadium(V) with 2-(2-quinolylazo)-5-diethylaminophenol (QADEAP) and the solid phase extraction of the colored chelate with $C_{18}$ cartridge. The QADEAP reacts with V(V) in the presence of citric acid-sodium hydroxide buffer solution (pH = 3.5) and cetyl trimethylammonium bromide (CTMAB) medium to form a violet chelate of a molar ratio 1 : 2 (V(V) to QADEAP). This chelate was enriched by solid phase extraction with $C_{18}$cartridge and the enrichment factor of 50 was obtained by elution of the chelates from the cartridge with ethanol. The molar absorptivity of the chelate is $1.28 {\times}10^5L\;mol^{-1}cm^{-1}$ at 590 nm in the measured solution. Beer's law is obeyed in the range of 0.01-0.6 ${\mu}$g/mL. The detection limit is 0.04 ${\mu}$g/L in the original samples. This method was applied to the determination of vanadium(V) in water and biological samples with good results.

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References

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