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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 23, Number 10
BKCSDE 23(10)
October 20, 2002 

 
Title
Extraction Equilibria and Solvent Sublation for Determination of Ultra Trace Bi(III), In(III) and Tl(III) in Water Samples by Ion-Pairs of Metal-2-Naphthoate Complexes and Tetrabutylammonium Ion
Author
Young-Sang Kim, Yoon-seok Choi, Won Lee
Keywords
Solvent sublation, 2-Naphthoic acid, Ion-pair formation, Solvent extraction, Flotation technique
Abstract
The solvent sublation using ion pairs of metal-2-naphthoate(2-HNph) and tetrabutyl ammonium (TBA + ) ion has been studied for the concentration and determination of ultra trace Bi(Ⅲ), In(Ⅲ) and Tl(Ⅲ) ions in water samples. The partition coefficients (Kp) and the extraction percentages of 2-HNph and the ion pairs to methyl isobutyl ketone (MIBK) were obtained as basic data. After the ion pair TBA + ·M(Nph)4 - was formed in water samples, the analytes were concentrated by the solvent sublation and the elements were determined by GF-AAS. The pH of the sample solution, the amount of the ligand and counter ion added and stirring time were optimized for the efficient formation of the ion pair. The type and amount of optimum surfactant, bubbling time with nitrogen and the type of solvent were investigated for the solvent sublation as well. 10.0 mL of 0.1 M 2-HNph and 2.0 mL of 0.1 M TBA + were added to a 1.0 L sample solution at pH 5.0. After 2.0 mL of 0.2%(w/v) Triton X-100 was added, the ion pairs were extracted into 20.0 mL MIBK in a flotation cell by bubbling. The analytes were determined by a calibration curve method with measured absorbances in MIBK, and the recovery was 80-120%.
Page
1381 - 1388
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