新试剂2-(3-羧基-2,4,5-三氮唑偶氮)-5-二甲氨基苯磺酸与钯显色反应的研究及应用  

Color Reaction of 2-[3-Carboxy-2,4,5,-Triazolylazo]-5-Dimethylaminobenzenesulfonic Acid with Palladium and Its Application

作　　者：韩德满[1] 叶巧云[1] 蒋华江[1] 

机构地区：[1]台州师范专科学校化学系,浙江省临海市317000

出　　处：《光谱实验室》2001年第6期777-779,共3页Chinese Journal of Spectroscopy Laboratory

基　　金：浙江省教育委员会科研启动基金资助课题 (编号 972 0 1)

摘　　要：本文合成了水溶性新型显色剂 2 - (3-羧基 - 2 ,4 ,5 -三氮唑偶氮 ) - 5 -二甲氨基苯磺酸 (CTZAMBS) ,并研究了其与钯的显色反应。结果表明 ,在 p H=1.5 8邻苯二甲酸氢钾缓冲液中 ,试剂与钯形成 2∶ 1蓝色络合物 ,λmax为 5 78.6nm,钯含量在 0— 2 .0 μg·m L-1范围内符合比耳定律 ,表观摩尔吸光系数为 3.19× 10 4 L·mol-1· cm-1,选择性好。本方法可直接测定钯催化剂中的微量钯 ,操作简便 。carboxy\|2,4,5\|triazolylazo\]\|5\|dimethylaminobenzenesulfonic acid(CTZAMBS) was synthesized and the color reaction of CTZAMBS with palladium was studied.The experimental results show that palladium reacts with CTZAMBS to form a stable blue complex at pH 1.0_2.5.The apparent molar absorptivity is 3.19×10\+4L·mol -1 ·cm -1 in water solution at 578.6nm.Beer's law is obeyed in the range of 0-2.0μg·mL -1 for palladium.The compound of palladium to CTZANBS in the complex is 1∶2.The method was applied to the spectrophotometric determination of trace palladium in Pd\|catalysts with satisfactory results.

关 键 词：2-(3-羧基-2 4 5-三氮唑偶氮)-5-二甲氨基苯磺酸 分光光度法 钯 显色反应 钯催化剂 测定 

分 类 号：O643.36[理学—物理化学] O614.823[理学—化学]