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Extraction mechanism of Cr(VI) on the aqueous two-phase system of tetrabutylammonium bromide and (NH4)2SO4mixture

Authors
Journal
Talanta
0039-9140
Publisher
Elsevier
Publication Date
Volume
57
Issue
4
Identifiers
DOI: 10.1016/s0039-9140(02)00076-0
Keywords
  • Aqueous Two-Phase System
  • Extraction Of Chromium(Vi)
  • Tetrabutylammonium Bromide (Tbab)

Abstract

Abstract An aqueous two-phase system of tetrabutylammonium bromide (TBAB) and (NH 4) 2SO 4 mixture has been developed for the extractive preconcentration and separation of certain compounds. TBAB concentration in upper phase is much higher than that of bottom solution. This new aqueous two-phase system is proposed for the highly selective extraction of Cr(VI) from large amounts of Cr 3+. The Cr(VI) is found to be extracted into the TBAB-rich upper phase due to ion pair formation such as HCrO 4 − · TBAB +. The Cr(VI) was sufficiently extracted into the upper phase in the pH range from 1 to 5. The proposed method has been applied to the determination of trace of Cr(VI) in wastewater samples with a coefficient of variation less than 3.2%. The recovery obtained was not lower than 90%. The determination limit for the Cr(VI) was found to be 60 μg l −1 in 10 ml of sample solution.

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