Proceedings of The 5 th Annuual International Conference Syiah Kuala University (AIC Unsyiah) 2015 In conjunction with The 8 th International Conference of Chemical Engineering on Science and Applications (ChESA) 2015 September 9-11, 2015, Banda Aceh, Indonesia 88 Extraction of Nickel(II) and Zink(I I ) by Using A Solvent Impregnated Resin Containing 1-Nitrophenyl-3-methyl-4-octylbenzoyl-5- pyrazolone * Ibnu Khaldun, Rusman, and Muhammad Nasir Department of Chemistry Education, FKIP, Syiah Kuala University, Darussalam, Banda Aceh 23111, Indonesia; * Coorresponding Author : ibnukhdn@yahoo.com Abstract The study on the equilibrium distribution of nickel(II) and zink(II) between aqueous solution and macromolecular resin impregnated with 1-nitrophenyl- 3-methyl-4-octylbenzoyl-5-pyrazolone (HNPMOBP, HL) have been conducted. In this research, the effects of pH values, and metal ion concentration on the yield were investigated. Analysis of the results shows that the extraction of the two metal ions can be explained assuming the formation of metal complexes in the resin phase with a general composition ML2. An extraction reaction is proposed and the equilibrium constants of the complexes were determined to be -6.15 and -3.45. The efficiency of the resin in the separation of nickel (II) and zink(II) is provided according to the separation factors. Under the experimental conditions employed, pH 50 values for zink (II) and nickel(II) were respectively found to be at 2.76 and 4.95. Key words: Extraction, Zink, Nickel, Solvent impregnated resin, 1- nitrophenyl-3-methyl-4-octylbenzoyl-5-pyrazolone Introduction Solvent extraction and ion exchange techniques have been widely used as a basic technique for the separation of metal ions from aqueous solutions. However, recovery and separation by solvent extraction requires multiuse extraction and back-extraction in order to attain the sufficient separation. Also, ion exchange resins have lower extraction selectivity for transition metals with respect to alkali metals. As an alternative approach, solvent impregnated resins (SIR) have been proposed by Warshawsky (Warshawsky, 1981) for selective separation of metal ions by direct adsorption of the extractant into macroporous polymeric supports. In the last decades, the study of SIR has been a major field of research in separation science, and they could be considered as a link between solvent extraction and ion- exchange technologies (Cortina and Warshawski, 1997). The SIR concept is based on the incorporation of a solvent extraction reagent into a porous polymer by a physical impregnation technique. Recently, solvent impregnated resins have been used in the extraction of metals from a multicomponent mixture in various analytical applications. The impregnated extractants include acidic organophosphorus compounds such as di(2-ethyl-hexyl)phosphoric acid, and 2-ethylhexylphosphonic acid mono-2-ethylhexylester, bifunctional organophosphorus compound. Some other extractants such as tri- n -octylamine, quaternary alkylammonium