对硝基重氮氨基偶氮苯光度法测定痕量铜  

Spectrophotometric Determination of Trace Copper(Ⅱ) with p-Nitrodiazoaminoazabenzene

作　　者：金文斌[1] 潘明秀[1] JIN Wen-bin PAN Min-xiu(Nantong Vocational University, Nantong 226007, Chin)

机构地区：[1]南通职业大学化工系,江苏南通226007

出　　处：《广州化学》2016年第5期46-49,共4页Guangzhou Chemistry

摘　　要：研究了对硝基重氮氨基偶氮苯与铜（Ⅱ）的显色反应，实验表明，在辛基酚聚氧乙烯醚（OP-10）微乳液存在下，于pH9．0的硼砂一盐酸缓冲溶液中，铜（Ⅱ）与该试剂形成稳定的深红色配合物，最大吸收波长位于513nm处，铜（Ⅱ）在0～0．4μg／mL范围内符合比耳定律，线性方程为A=0．0083＋0．1009C，相关系数0．9996，表观摩尔吸光系数为1．64×10^5L／（mol·cm）。方法用于大米中痕量铜的测定，相对标准偏差（RSD）为1．4％～2．1％，加标回收率为97％103％，测得结果与原子吸收光谱法相符合。The colour reaction of p-nitrodiazoaminoazabenzene with trace copper（ Ⅱ ） has been studied. In the presence of OP-10 microemulsion and in borax-HClbuffer at pH 9.0, copper（ Ⅱ） reacts with p-nitrodiazoaminoazabenzene to form a stable red complex. The maximum absorption of the complex is at 513 nm. Beer＇s law is obeyed for 0~0.4 μg/mL. The absorptivity was A=0.008 3＋0.100 9 C, with correlation coemcient oof 0.9996. And apparent molar absorptivity fs 1.64×10^5L/（mol·cm）. The method has been applied to the determination of copper （Ⅱ） in rice sample with RSD of 1.4%~2.1% and recovery of 97%~ 103%, values of copper（Ⅱ） contents found were checked quite well with the results found by AAS.

关 键 词：对硝基重氮氨基偶氮苯 分光光度法 铜:微乳液 

分 类 号：O657.31[理学—分析化学]