1-偶氮苯-3-(5-氯-2-吡啶)-三氮烯的合成及其与镍的显色反应  

Synthesis of 1-Azobenzene-3-(5-Chloro-2-Pyridyl)-Triazene and Its Color Reaction with Nickel

作　　者：郑云法[1] 张春牛[1] 顾勇冰[1] 

机构地区：[1]丽水学院化学系,浙江丽水323000

出　　处：《岩矿测试》2005年第2期112-114,共3页Rock and Mineral Analysis

基　　金：浙江丽水学院重点课题(KZ04006)

摘　　要：报道了新显色剂1-偶氮苯-3-(5氯-2-吡啶)-三氮烯的合成及其与镍的显色反应.在pH 10.5的Na2B4O7-NaOH缓冲溶液中和表面活性剂OP存在下,1-偶氮苯3-(5-氯-2-吡啶)-三氮烯可与镍发生显色反应,生成3:1的红色配合物,据此建立了分光光度法测定镍的方法.配合物的最大吸收峰位于540 nm处,表观摩尔吸光系数为1.62×105L·mol-1·cm-1.Ni2+的质量浓度在0～480 μg /L符合比尔定律.用拟定方法测定合金中的微量镍,结果与标准值相符,6次测定的相对标准偏差(RSD)<2%.azobenzene-3-(5-chloro-2-pyridyl)-triazene (A BC PDT) as a chromogenic reagent was synthesized and its color reaction with nicke l was investigated. In the buffer solution of Na 2B 4O 7-NaOH (p H 10.5) and with the existence of surface active agent of OP,1-azobenzene-3- (5-chloro-2-pyridyl)-triazene reacts with nickel to form a red complex with molar ratio of Ni 2+∶ABCPDT=1∶3. The absorption maximum o f the complex lies at 540 nm with an apparent molar absorptivity of 1.62×10 5 L·mol -1·cm -1. The Beer′s law is well obeyed in the range of 0～480 μg/L of nickel. The method has been applied to the direct determination of nickel in alloy with satisfactory results and precision of less than 2% RSD (n=6).

关 键 词：显色反应 三氮烯 偶氮苯 吡啶 合成 表观摩尔吸光系数 分光光度法测定 氯 相对标准偏差 表面活性剂 NI^2+ 缓冲溶液 比尔定律 质量浓度 配合物 显色剂 微量镍 标准值 峰位 

分 类 号：O614.121[理学—无机化学] O657.3[理学—化学]