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KMID : 1059519920360040546
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Journal of the Korean Chemical Society
1992 Volume.36 No. 4 p.546 ~ p.551
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A Study on the Solvent Extraction Mechanism of Nickel(Ⅱ) with N-Benzylisonitrosoacetylacetone Imine by Spectrophotometry
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Lee Heung-Lark
Bae Zun-Ung
Kim Dong-Gyu
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Abstract
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Reaction mechanism on the solvent extraction of nickel(Ⅱ) with N-benzylisonitrosoacetylacetone imine(HIAANB) was studied spectrophotometrically. Absorbance was measured by changing the ligand HIAANB concentration in the chloroform organic phase and the pH values in the agueous solution phase. From the absorbance data, the reaction rate was found to be the first order for HIAANB concentration and the inverse first one for [H+]. The rate determining step of the extraction reaction and the rate equation are as follows; Ni2+＋HIAANB → Ni-IAANB+＋H+ -d[Ni2+] / dt = K'[Ni2+][HIAANB]o / [H+] Calibration curve for the spectrophotometric determination of nickel(Ⅱ) ion in the aqueous solution was linear below the concentration of 1.17 ppm at the optimum experimental condition. And the ligand-to-metal ratio, the relationship between extractability and pH of the aqueous phase, and the effect of diverse ion on the determination of nickel(Ⅱ) ion were examined.
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