2,7-双(5-羧基-1,3,4-三氮唑偶氮)-H酸和过氧化氢催化动力学光度法测定痕量铜(Ⅱ)的研究

来源期刊：冶金分析2011年第5期

论文作者：葛昌华 潘富友 梁华定 林彩飞

文章页码：49 - 52

关键词：铜(Ⅱ)； 2,7-双(5-羧基-1,3,4-三氮唑偶氮)-H酸； 过氧化氢； 动力学光度法

Key words：copper (Ⅱ)； 2,7-bi (5-carboxy-1,3,4-triazole)-H acid； hydrogen peroxide； kinetic spectrophotometry

摘    要：研究了铜(Ⅱ)催化H₂O₂氧化2,7-双(5-羧基-1,3,4-三氮唑偶氮)-H酸(BCTZAHA)褪色反应及其动力学条件,并基于褪色反应程度与铜(Ⅱ)量在一定范围内呈线性关系,建立了测定痕量铜(Ⅱ)的催化动力学光度法。在pH 10.0的NH_3^·H₂O-NH₄Cl缓冲溶液介质中,褪色体系的最大吸收波长为540 nm,铜(Ⅱ)质量浓度在0.001～0.04μg/mL范围呈线性关系,回归方程为△A=22.124 2ρ+0.001 07(ρ:μg/mL),相关系数r=0.999 1,检出限为1.32×10^-11 g/mL。方法不经分离直接测定河水、管网水和井水水样中痕量铜,结果与AAS法测定值相符。

Abstract: The fading reaction and kinetic condition between copper (Ⅱ) and 2,7-bi(5-carboxy-1,3,4-triazole)-H acid(i.e.2,7-bi(5-carboxy-1,3,4-triazole)-1-amino-8-naphthol-3,6-disulfonic acid,BCTZAHA) were studied.A catalytic kinetic spctrophotometric determination method of trace copper was established based on the linear relationship between fading reaction extent and the content of copper (Ⅱ) in certain range.In the medium of NH₃·H₂O-NH₄Cl buffer solution at pH 10.0,the maximum absorption wavelength of fading system was at 540 nm.The calibration curve was linear for copper (Ⅱ) in the range of 0.001～0.04 mg/L.The linear regression equation was △A=22.124 2 ρ+0.001 07(ρ: mg/L)with correlation coefficient of 0.999 1.The detection limit was 1.32×10^-11 g/mL.The method had been applied to the direct determination of trace copper in river water,tap water and well water samples without separation.The results were in good agreement with the values obtained by atomic absorption spectrometry(AAS).