新显色剂3-[(对羧基苯)偶氮]-6-[(5-羧基-1,3,4-三氮唑)偶氮]-变色酸的合成及与铜显色反应的研究  

Synthesis and Determination of Copper by Spectrphotometric with 3-(p-Carboxy-Phenylazo-6-(5-Carboxy-1,3,4-Triazolylazo)-Chromotropic Acid

作　　者：陈红[1] 葛昌华[1] 梁华定[1] 潘富友[1] 张燕燕[1] 

机构地区：[1]台州学院化学系,临海317000

出　　处：《科学技术与工程》2007年第3期364-366,共3页Science Technology and Engineering

基　　金：浙江省教育厅计划课题(20050051)资助

摘　　要：研究了新显色剂3-[(对羧基苯)偶氮]-6-[(5-羧基-1,3,4三氮唑)偶氮]-变色酸(CPCTZCA)的合成及与铜显色反应的条件。结果表明,在pH9.0的NH3-NH4Cl的缓冲溶液中,铜(II)与CPCTZCA形成配合比为1:2的稳定的蓝紫色配合物,其最大吸收波长在655nm处,表观摩尔吸光系数为1.4×104(L.mol-1.cm-1),Cu2+质量分数在(0～20)μg/25mL范围内服从比尔定律。所拟方法可不经分离直接测定镁合金、铝合金标样中的微量铜,结果与认定值相符。The synthesis and the colour reaction of a new reagent （CPCTZCA） with Copper （ Ⅱ ） were studied. The results showed that the new reagent reacts with Copper（ Ⅱ ） to form a stable blue purple complex（ 1：2 by mole） in the medium of NH3-NH4Cl with pH 9.0. The apparent molar absorptivity was 1.4 × 10^4（ L · mol^-1· cm ^-1）, and maximum absorption wavelength was at 645 nm. Beer＇s law was obeyed in the range of （ 0 -20） μg/25mL for Cu^2＋. The method had been used for the direct determination of copper in aluminum metal alloy and magnesium metal alloy. The results compare favourably witb the cerified valued.

关 键 词：3-[(对羧基苯)偶氮]-6-[(5-羧基-1 3 4三氮唑)偶氮]-变色酸 分光光度法 铜 

分 类 号：O657.3[理学—分析化学]