CdTe量子点-Ru(bpy)_3^(2+)体系阴极电致化学发光法测定邻苯二酚  

Determination of Pyrocatechol by Cathodic Electrochemiluminescence of Cd Te Quantum Dots-Ru(bpy)_3^(2+) System

作　　者：罗晓伟[1] 刘彩云[2] 王乐政 国云 周敏[1] Luo Xiaowei Liu Caiyun Wang Lezheng Guo Yun Zhou Min(Key Laboratory of Bioelectrochemistry and Environmental Analysis of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070 College of Chemistry and Chemical Engineering, Hexi University, Zhangye 743000)

机构地区：[1]西北师范大学化学化工学院甘肃省生物电化学与环境分析重点实验室,兰州730070 [2]河西学院化学化工学院,张掖743000

出　　处：《化学通报》2017年第6期563-567,共5页Chemistry

基　　金：国家自然科学基金项目(21167015)资助

摘　　要：根据邻苯二酚对Cd Te量子点增敏的Ru(bpy)32+阴极电致化学发光强度有较强的抑制作用,建立了一种简单的测定邻苯二酚的电致化学发光分析方法。分别探究了磷酸盐缓冲溶液的浓度、pH、量子点的浓度、Ru(bpy)_3^(2+)的浓度、扫描速率以及电位等因素对该体系发光行为的影响。在优化实验条件下,电致化学发光强度的对数与邻苯二酚浓度的对数在7.0×10^(-8)~4.0×10^(-5)mol/L范围内呈现良好的线性关系,检出限为2.3×10^(-8)mol/L(3σ)。对4.0×10^(-6)mol/L的邻苯二酚标准溶液进行六次平行测定,其电致化学发光强度的相对标准偏差(RSD)为1.1%。该方法可成功应用于模拟环境水样中邻苯二酚的含量测定,加标回收率介于95.0%~105.7%之间。A novel electrogenerated chemiluminescence （ECL） method for the determination of pyrocatechol has been developed in this paper based on the quenching effect of pyroeatechol on the cathodic ECL intensity of the Rn（bpy）32＋ -CdTe quantum dots （QDs） system in phosphate buffer solution （pH = 7.0）. The effects of buffer concentration, pH, CdTe QDs concentration, Ru （bpy）32＋ concentration, scan rate and potential windows on the luminescence of the system were investigated. Under the optimal experimental conditions, the log value of ECL intensity and the log value of pyrocatechol concentration showed a good linear relationship in the range of 7.0 × 10^ -8× 4. 0 × 10^-5mol/L with the detection limit of 2.3 × 10^- 8mol/L （3σ）. The relative standard deviations （RSD） of the ECL intensity for 4.0× 10^-6mol/L standard pyrocatechol solution was 1.1% （n = 6）. The present method has been successfully used to determine pyrocatechol in simulated environmental water samples with average recoveries from 95.0 % to 105.7 %.

关 键 词：CDTE量子点 Ru(bpy)32+ 电致化学发光 邻苯二酚 

分 类 号：O657.1[理学—分析化学] X832[理学—化学]