新显色剂2-(5-羧基-1,3,4-三氮唑偶氮)-5-二乙氨基酚分光光度法测定钒  

Colour reaction of 2(5carboxy1,3,4triazolylazo)5diethylamino phenol with vanadium

作　　者：梁华定[1] 潘富友[1] 张孙玮[2] 

机构地区：[1]台州师范专科学校化学系 [2]杭州大学化学系

出　　处：《化学试剂》1999年第3期179-180,182,共3页Chemical Reagents

基　　金：浙江省自然科学基金

摘　　要：报道了新显色剂２－（５－羧基－１，３，４－三氮唑偶氮）－５－二乙氨基酚（ＣＴＺＡＰＮ）分光光度法测定钒的条件。在ｐＨ７的ＮＨ４Ａｃ缓冲溶液中，ＣＴＺＡＰＮ与Ｖ（Ⅴ）形成稳定的紫红色配合物，其配合比Ｖ（Ⅴ）∶Ｒ＝１∶１，λｍａｘ＝５４０ｎｍ，摩尔吸光系数２．３２×１０４Ｌ·ｍｏｌ－１·ｃｍ－１。Ｖ（Ⅴ）在０～１μｇ／ｍＬ范围内符合比耳定律，且具有良好的选择性。所建立的方法已用于实际样品中钒的测定，结果满意。n this paper,the conditions of colour reaction of a new reagent 2(5carboxy1,3,4triazolylazo)5diethylamino phenol with vanadium are reported.Results show that the new colour reagent reacts with V() to form a stable red complex (11) at pH7.The absorption maximum and apparent molar absorptivity are 540nm and 2.32104Lmol-1cm-1 respectively.Beers law is obeyed in the range of 01g/mL.The method is highly sensitive and selective and has been applied to the direct determination of vanadium in practical samples with satisfactory results.

关 键 词：CTZAPN 分光光度法 钒 测定 显色剂 

分 类 号：O657.303[理学—分析化学] O614.511[理学—化学]