Liquid-Liquid Extraction of Palladium(II) from Hydrobromic Acid Media by Hexadecylpyridinium Bromide

A simple and rapid liquid-liquid extraction of palladium has been studied involving ion-pairing of bromocomplexes of palladium(II) with hexadecylpyridinium bromide (HDPB) dissolved in chloroform. The stoichiometry and distribution of (HDP)2PdBr4 between the aqueous and organic phase was investigated...

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Bibliographic Details
Published in:Analytical Sciences Vol. 18; no. 3; pp. 307 - 311
Main Authors: SALIMI, Shabnam, JABBARI, Ali, ALIZADEH, Naader
Format: Journal Article
Language:English
Published: Tokyo The Japan Society for Analytical Chemistry 2002
Japan Society for Analytical Chemistry
Nature Publishing Group
Subjects:
Analytical chemistry
Chemistry
Chloroform
Exact sciences and technology
Palladium
Spectrometric and optical methods
Equilibrium constant
Chemical analysis
Ion pair production
Interelement effect
Liquid liquid extraction
Cationic surfactant
Association constant
Chemical enrichment
Transition metal Ions
Palladium ion
Chemical properties
Aqueous solution
Hydrobromic acid
Platinoid Ions
Quantitative analysis
Ultraviolet visible spectrometry
Atomic absorption spectrometry
ISSN:0910-6340, 1348-2246
Online Access:Get full text
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Summary:A simple and rapid liquid-liquid extraction of palladium has been studied involving ion-pairing of bromocomplexes of palladium(II) with hexadecylpyridinium bromide (HDPB) dissolved in chloroform. The stoichiometry and distribution of (HDP)2PdBr4 between the aqueous and organic phase was investigated by spectrophotometric mole ratio method. The extraction efficiency of palladium(II) by HDPB was studied as a function of several variables: acid, salt, surfactant concentration and equilibrium time. The results showed that PdBr42- extraction could be explained by assuming the formation of (HDP)2PdBr4 complexes in the aqueous solution and transfer to organic phase. The extraction was fast and the shaking time was only a few min. The average recovery of palladium(II) from an aqueous solution containing 10 µg/ml of analyte was 99% with an RSD% of 0.95. The percentage recovery of 0.2 µg/ml palladium(II) was 96%.
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ISSN:0910-6340
1348-2246
DOI:10.2116/analsci.18.307