A Study on the Solvent Extraction Mechanism of Nickel(Ⅱ) with N-Benzylisonitrosoacetylacetone Imine by Spectrophotometry

분광광도법에 의한 Ni(Ⅱ)-N-Benzylisonitrosoacetylacetone Imine착물의 용매추출 반응메카니즘

  • Heung Lark Lee (Department of Chemistry, College of Natural Science, Kyungpook National University) ;
  • Zun Ung Bae (Department of Chemistry, College of Natural Science, Kyungpook National University) ;
  • Dong-Gyu Kim (Neung-In High School)
  • 이흥락 (경북대학교 자연과학대학 화학과) ;
  • 배준웅 (경북대학교 자연과학대학 화학과) ;
  • 김동규 (능인고등학교)
  • Published : 1992.08.20

Abstract

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; $Ni^{2+}$+HIAANB ${\to}$ Ni-IAANB$^+$$H^+$ -d[Ni$^{2+}$] / dt = K'[Ni$^{2+}$][HIAANB]$_0$ / [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.

니켈(Ⅱ)이온을 N-benzylisonitrosoacetylacetone imine(HIAANB)으로 용매추출할 때의 반응메카니즘을 분광광도법으로 연구하였다. 유기상 chloroform에 녹아있는 리간드 HIAANB농도와 수용액층의 pH값을 변화시켜 가면서 흡광도를 측정하였다. 측정 데이터로부터 반응속도가 HIAANB농도에 대하여는 1차, [$H^+$]에 대하여는 -1차임을 알 수 있었다. 추출반응의 속도결정단계와 속도식은 다음과 같다. $Ni^{2+}$+HIAANB ${\to}$ Ni-IAANB$^+$$H^+$ -d[Ni$^{2+}$] / dt = K'[Ni$^{2+}$][HIAANB]$_0$ / [H$^+$]. 수용액 중의 니켈(Ⅱ)이온을 분광광도법으로 정량할 때의 검정곡선은 최적실험조건에서 1.17ppm 이하의 농도범위에서 직선이었다. 또 리간드 대 금속의 결합비, 추출율과 수용액상의 pH 사이의 관계, 니켈(Ⅱ)이온을 정량할 때의 방해이온의 영향도 조사하였다.

Keywords

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