Analytical Sciences

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

Naader ALIZADEH,*  Shabnam SALIMI,* and Ali JABBARI**

*Department of Chemistry, Tarbiat Modarres University, P. O. Box 14115-111, Tehran, Iran
**Department of Chemistry, Khajeh Nasir Toosi University, Tehran, Iran

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 PdBr₄^2- 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 ug/ml of analyte was 99% with an RSD% of 0.95. The percentage recovery of 0.2 ug/ml palladium(II) was 96%.

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