- 作者: 許東明; 蔡瑛瑛
- 作者服務機構: Department of Chemistry, National Taiwan University, Taipei, Taiwan, Republic of China
- 中文摘要: Cerium(III) chelate of 7-iodo-8-hydroxyquinoline-5-sulphonic acid(ferron) has been studied spectrophotometrically in aqueous solution at 25℃ and at an ionic strength of 0.1M. The formation of this chelate was was pH dependent, and the optimum pH range was between 5.5 to 6.0. its mole ratio of ligand to cerium(III) ion was found to be 2 to 1 stoichiometry and the formation constant, log K, was determined as 10.15. Enthalpy and entropy changes characterizing the formation of the chelate have been calculated as follows: ΔG°=—13.85 kcal mole¯1, ΔH°=—5.03 kcal mole¯1, ΔS°=29.56 eu mole¯1. By using the wavelength of 370 nm, determination of trace amount of cerium(III) ion the sensitivity of 0.056γ/cm2 was possible.
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