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研究了铁(Ⅲ)催化H2O2氧化2-(5-羧基-1,3,4-三氮唑偶氮)-5-二乙氨基苯甲酸(CTZDBA)的褪色反应及其动力学条件,褪色反应程度与铁(Ⅲ)量在一定范围内呈线性关系,建立了测定痕量铁(Ⅲ)的催化动力学光度法。在pH4.0的HAc-NaAc缓冲溶液介质中,褪色体系的最大吸收波长581nm,Fe(Ⅲ)的质量浓度在0.0008～0.04μg/mL范围内符合线性关系,回归方程为ΔA=25.325ρ-8.02×10-3(ρ:μg/mL),相关系数为0.9977,检出限3.78×10-10g/mL,方法用于头发和面粉中痕量铁的测定,结果与AAS测定结果相符。
The fading reaction and kinetic conditions of 2- (5-carboxy-1,3,4-triazolylazo) -5-diethylaminobenzoic acid (CTZDBA) catalyzed by H2O2 catalyzed by iron (Ⅲ) A linear relationship between iron (Ⅲ) content and iron (Ⅲ) content was established within a certain range. A catalytic kinetic spectrophotometric method for the determination of trace iron (Ⅲ) was established. In the HAc-NaAc buffer solution at pH4.0, the maximum absorption wavelength of the fading system is 581 nm, and the mass concentration of Fe (Ⅲ) is in the range of 0.0008-0.04 μg / mL. The regression equation is ΔA = 25.325ρ-8.02 × 10-3 (ρ: μg / mL). The correlation coefficient was 0.9977. The detection limit was 3.78 × 10-10 g / mL. The method was applied to the determination of trace iron in hair and flour. The results were consistent with the results of AAS.