2-羟基-3-磺酸基-5-硝基苯基重氮氨基偶氮苯与铜(Ⅱ)的显色反应及其应用  

CHROMOGENIC REACTION OF COPPER(Ⅱ) WITH 2-HYDROXY-3-SULFO-5-NITROBENZENE- DIAZOAMINOAZOBENZENE AND ITS APPLICATION

作　　者：岳志劲[1] 孟双明[1] 关翠琳[1] 张桂枝[1] 刘永文[1] 

机构地区：[1]雁北师范学院化学系,大同037009

出　　处：《化学分析计量》2005年第4期31-33,共3页Chemical Analysis And Meterage

摘　　要：对显色剂2羟基3磺酸基5硝基苯基重氮氨基偶氮苯(HSNDAA)与铜(Ⅱ)的显色反应进行了研究。建立了测定铜的新方法。在非离子表面活性剂TritonX-100存在下,于pH=10.2的Na2B4O7-NaOH缓冲介质中,HSNDAA与铜(Ⅱ)可形成物质的量比为2∶1的红色配合物,其最大吸收波长位于530nm处,铜(Ⅱ)的质量浓度在0～0.8μg/mL范围内符合比耳定律,表观摩尔吸光系数为4.89×104L/(mol·cm)。用该方法测定雨水中的铜,5次测定结果的相对标准偏差为1.9%,回收率为97%～102%。In the presence of the surfactant Triton X-100, 2-hydroxy-3-sulfo-5-nitrobenzene-diazoaminoazobenzene(HSNDAA) reacted with copper(Ⅱ) to form stable red complex, the ratio of amount of substance between HSNDAA and Cu(Ⅱ) was 2∶1. In Na_2B_4O_7-NaOH buffer solution(pH=10.2), the maximum absorption wavelength of the complex was 530 nm and the apparent molar absorptivity was 4.89×10~4 L/(mol·cm). Beer′s law was obeyed in the range of 0～0.8 μg/mL for copper(Ⅱ). This method was applied to the determination of copper(Ⅱ) in rainwater, the relative standard deviation was 1.9%(n=5), the recovery was 97%~102%.

关 键 词：2-羟基-3-磺酸基-5-硝基苯基重氮氨基偶氮苯 铜 显色反应 含量测定 光度法 雨水 

分 类 号：O614.121[理学—无机化学] O661.1[理学—化学]