2-(5-羧基-1,3,4-三氮唑偶氮)-5-二乙氨基苯甲酸-过氧化氢催化动力学光度法测定痕量铁的研究  

Catalytic kinetic spectrophotometric determination of trace iron (Ⅲ) with 2-(5-carboxy-1,3,4-triazolylazo)-5-diethylaminobenzoic acid and hydrogen peroxide

作　　者：葛昌华[1] 梁华定[1] 潘富友[1] 陈林江[1] 

机构地区：[1]台州学院医药化工学院,台州317000

出　　处：《分析试验室》2010年第4期60-63,共4页Chinese Journal of Analysis Laboratory

基　　金：浙江省教育厅计划课题(20050051)项目资助

摘　　要：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。In this paper,a new catalytic kinetic method for the determination of trace iron (Ⅲ) is established based on the catalytic action of Fe3+ on the oxidative fading reaction between 2-(5-carboxyl-1,3,4-triazolylazo)-5-diethylaminobenzoic acid (CTZDBA) and hydrogen peroxide in the medium of HAc-NaAc at pH 4.0 and heating conditions.The maximum of the absorbance shows at 581 nm.The calibration curve is linear in the range of 0.0008～0.04 mg/L for iron,and the linear regression equation is A=25.325ρ-8.02×10-3 (ρ:μ...

关 键 词：铁(Ⅲ) 2-(5-羧基-1 3 4-三氮唑偶氮)-5-二乙氨基苯甲酸 过氧化氢 动力学光度法 

分 类 号：O657.3[理学—分析化学]