高等学校化学学报

高等学校化学学报 ›› 1989, Vol. 10 ›› Issue (5): 462.

• 研究论文 • 上一篇    下一篇

食用合成色素柠檬黄高灵敏度荧光光度法测定钯(Ⅱ)的研究

文志明, 王怀公   

  1. 兰州大学化学系
  • 收稿日期:1987-07-20 出版日期:1989-05-24 发布日期:1989-05-24
  • 通讯作者: 王怀公
  • 基金资助:

    国家自然科学基金

The Study on the Spectrofluorometric Determination of Microamounts of Palladium(Ⅱ) with Food Colour Tartrazine

Wen Zhiming, Wang Huaigong   

  1. Department of Chemistry, Lanzhou University, Lanzhou
  • Received:1987-07-20 Online:1989-05-24 Published:1989-05-24

PDF (PC)

被引次数

11

摘要： 首次报道了食用合成色素柠檬黄(TTZ)荧光光度法测定钯(Ⅱ)的新方法。沸水浴中加热20～60min,在pH2.6～4.0的HCl-NaAc缓冲溶液中,钯(Ⅱ)与TTZ形成组成比为Pd(Ⅱ):TTZ=1:2的络合物(λex=528nm,λem=558nm)。K稳f=9.71×10<11·εex=1.45×104L/mol·cm,φ=0.011。钯含量在0～12μg/25mL范围内与荧光强度成正比,检出下限为4×10-3μg/mL。本法可不经分离直接测定某些贵金属矿样中的微量钯,结果满意。

关键词: 钯的测定, 荧光光度法, 食用色素, 柠檬黄

Abstract: Anew highly sensitive and selective method has been developed for the spectrofluorometric determination of palladium( Ⅱ) with food colour Tartra-zine(TTZ) by heating them under a boiling water bath in a given time(20-60 min). It was found that the palladium (Ⅱ) might form a stable brown complex with TTZin HCl-NaAc buffer solution in the range of pH 2.6-4.0. The maximium excitation and emission wavelengths of complex are 528nm and 558nm. The composition of the complex is Pd( Ⅱ) :TTZ = 1:2. Its apparent stability constant(K) and molor absorptivity at the excitation wavelength(εex) are 0.7× 1011 and 1.45× 104 L/mol.cm respectively. The quantum yield(Φ) is 0.011.By this method, Pd( Ⅱ ) can be determinated in the range of 0～12μg/25 mL. The limit of determination is 4 × 10-3 μg/mL. The effect of deverse ions on the determination was also investigated. Asimple and rapid method was proposed for direct determination of Pd(Ⅱ ) in synthetic sample and in mineral without preseparation.

Key words: Palladium determination, Spectrofluorometry, Food colour, Tartrazine

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