【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pH 2.6～4.0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(λ_ex=528nm,λ_em=558nm)。K_稳^′=9.71x10¹¹·ε_ex=1.45x10⁴L/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4x10^-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。更多还原

【Abstract】 A new 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 TTZ in 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(EEex) 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 0-12?g/25 mL. The limit of determination is 4 × 10-3 ?g/mL. The effect of deverse ions on the determination was also investigated. A simple and rapid method was proposed for direct determination of Pd(Ⅱ ) in synthetic sample and in mineral without preseparation.更多还原