镉试剂pB[1-偶氮苯-4-(4'-溴代氨基偶氮苯)]吸光光度法测定微量镉  

Spectrophotometric determination of micro amounts of cadmium with cadion pB(p-bromo benzenediazoaminoazobenzene)

作　　者：尹权[1] 张华山[1] 王志良 

机构地区：[1]武汉大学化学系

出　　处：《化学试剂》1989年第3期137-139,共3页Chemical Reagents

摘　　要：对镉试剂 pB 的合成和性质及其与 Cd(Ⅱ)的反应进行了初步研究。在 Triton X-100存在下,于 pH10.5时,镉试剂现黄色,其最大吸收为405nm。在上述条件下,Cd(Ⅱ)和镉试剂 pB 形成1∶2的红色络合物,其最大吸收为515nm。摩尔吸光系数均4.5×10~5l·mol^(-1)·cm^(-1)。镉含量在0～3μg/25ml 范围内遵守比耳定律。镉试剂 PB 有较高的选择性,少数金属离子,如 Ni^(2+)、Hg^(2+)、Zn^(2+)、Cu^(2+)等产生干扰。The method of synthesis and the proper-ties of cadion pB and its spectrophotometricreaction with Cd(Ⅱ) have been investigated.In the presence of Triton X-100 and at pH10.5,the reagent solution is yellow and showsan absorption maximum at 405nm.The rea-gent reacts with Cd(Ⅱ)to form a red com-plex with a ratio of 1:2 which has an absorp-tion maximum at 515nm in the presence ofTriton X-100.The molar absorptivity is 4.510~5I·mol^(-1)·cm^(-1),Beer's law is obeyed forCd(Ⅱ)in the range of 0～3μg/25ml.Cadion pB has fairly good sensitivity.Some metal ions such as Ni^(2+),Hg^(2+),Zn^(2+),Cu^(2+)etc.interfere.

关 键 词：镉 吸光光度法 镉试剂 PB 

分 类 号：O614.242[理学—无机化学]