邻羟基苯基重氮氨基偶氮苯与铊(Ⅲ)的显色反应及其应用  

Color Reaction of Chromogenic Reagent O-Hydroxybenzenediazoamino-azobenzene with Thallium (Ⅲ) and Its Application

作　　者：曹小安[1] 陈永亨[1] 周怀伟[1] 方德新[1] 

机构地区：[1]广州师范学院化学系,广州510405

出　　处：《光谱学与光谱分析》2001年第3期350-352,共3页Spectroscopy and Spectral Analysis

基　　金：广东省自然科学基金!(980 383);广东省重点科技攻关项目!(99M0 530 1G)

摘　　要：本文研究了邻羟基苯基重氮氨基偶氮苯 (O HDAA)与Tl(Ⅲ )的显色反应。在TritonX 10 0和十二烷基苯磺酸钠 (SDBS)存在下 ,于 0 5 4～ 1 1mol·L-1氨水介质中 ,试剂与Tl(Ⅲ )形成 1∶5的稳定红色配合物 ,其最大吸收波长位于 5 2 0nm处 ,表观摩尔吸光系数为 1 4× 10 5L·mol-1·cm-1。Tl(Ⅲ )量在 0～ 6 0 0 μg·L-1之间符合朗伯 比耳定律。已用于直接测定水样及经泡沫塑料吸附分离后测定地质样品中的痕量铊 。The chromogenic reaction of the O hydroxybenzenediazoaminoazobenzene (O HDAA) with thallium was studied in this paper.In the presence of Triton X 100 and SDBS and in ammonia medium of 0 54—1 1 mol·L -1 ,O HDAA reacts with thallium (Ⅲ) to form a stable red complex with molar radio of 1∶5.The apparent molar absorptivity is 1 4×10 5 L·mol -1 ·cm -1 at the maximum absorption wavelength of 520 nm.Beer′s law is obeyed in the concentration range of 0—600 μg·L -1 Tl(Ⅲ).The method has been applied to the direct determination of trace amounts of thallium in waste water and in geological samples by using polyurethane foam to absorb and separate Tl(Ⅲ) with satisfactory results.

关 键 词：邻羟基苯基重氮氨基偶氮苯 分光光度法 显色反应 铊 痕量分析 

分 类 号：O614.373[理学—无机化学] O657.32[理学—化学]