鲁米诺-过氧化氢-铬(Ⅲ)-吐温-80化学发光体系的研究与应用  

Study on the chemiluminescent system of luminol-H_2O_2-Cr(Ⅲ)-Tween-80 and its application

作　　者：李淮芬[1] 谢成根[1] 

机构地区：[1]皖西学院化学与生命科学系,安徽六安237012

出　　处：《冶金分析》2006年第6期17-19,共3页Metallurgical Analysis

基　　金：安徽省高校优秀中青年骨干教师资助计划(200579)

摘　　要：基于非离子表面活性剂吐温-80对鲁米诺-过氧化氢-铬(Ⅲ)化学发光反应有较强的敏化作用,结合流动注射技术,建立了鲁米诺-过氧化氢-铬(Ⅲ)-吐温-80化学发光体系测定铬(Ⅲ)的分析方法。该法测定铬(Ⅲ)的线性范围为6.0×10-8-8.0×10-5mol/L,检出限为1.2×10-8mol/L。对浓度2.0×10-6mol/L铬(Ⅲ)标准溶液平行测定11次,相对标准偏差(RSD)为1.09%。利用柠檬酸和草酸作掩蔽剂,可有效地消除水体中Fe2+,Co2+,Cu2+等金属离子对测定Cr(Ⅲ)的干扰,从而可用于环境水样中铬(Ⅲ)的测定,回收率在91%-104%之间。Based on the obvious sensitization of nonionic surfactant Tween-80 on the chemiluminescent reaction in the system of luminol - H2O2 - Cr（Ⅲ）, a sensitive chemiluminescent method for the determination of Cr（Ⅲ） with flow injection technique was developed. The method is simple, rapid and effective to determine Cr（Ⅲ） in the range of 6.0×10^-8- 8.0 × 10^-5 mol/L with detection limit of 1.2 × 10^-8mol/L. The relative standard deviation is 1.09 % for the determination of 2.0 × 10^- 6 mol/L of Cr（Ⅲ） （ n = 11 ）. Although some metal ions such as Fe^2＋ , Co^2＋ , Cu^2＋ may interfere with the determination of Cr（Ⅲ）, citric acid and oxalic acid can eliminate this interference. Therefore, the method is successfully applied to determine the content of Cr（Ⅲ） in water samples in the presence of masking agents with the recoveries of 91% - 104 %.

关 键 词：化学发光 鲁米诺 过氧化氢 吐温-80 铬(Ⅲ) 

分 类 号：O657.3[理学—分析化学]