Selective Determination Method of Cr(Ⅲ) and Cr(Ⅵ) by Aliquat 336 Extraction and Flame Atomic Absorption Spectrometry

Cr(Ⅲ) 와 Cr(Ⅵ)의 Aliquat 336을 이용한 추출분리 및 원자흡수분광법에 의한 정량

  • Kim, Cheon Han (Department of Chemistry, College of Natural Science, Kookmin University) ;
  • Hwang, Hye Ryeon (Department of Chemistry, College of Natural Science, Kookmin University)
  • 김천한 (국민대학교 자연과학대학 화학과) ;
  • 황혜련 (국민대학교 자연과학대학 화학과)
  • Published : 19990800

Abstract

A method is described for the selective determination of Cr(III) and Cr(VI) in aqueous solutios by flame atomic absorption spectrometry. Selective extraction of $Cr_2O_7^{2-}$ was performed by Aliquat 336/NIBK from the mixtures of $Cr^{3+}$ and $Cr_2O_7^{2-}$, and the extraction of $Cr^{3+}$ was followed after complex formation with citrate by using the same extractant. The concentraction of each analyte in the extract was determined by $N_2O-C_2H_2$ flame atomic absorption spectrometry. The recoveries of $Cr^{3+}$ and $Cr_2O_7^{2-}$ from 50mL of aqueous solution ranging 0.1~1.0 ${\mu}g/mL$ as Cr respectively by single extractions with 5 mL of 1%(V/V) Aliquat 336/MIBK were resulted as 98.8∼101.7%.

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References

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