摘要
报道了以１－（４－安替比林基）－３－（２，４－二硝基苯基）－三氮烯（ＡＰＤＮＢＴ）作显色剂，用双波长法光度测定痕量Ａｇ（Ｉ）的显色条件。在Ｔｗｅｅｎ－８０存在和ｐＨ为１０．５￣１２．５范围，试剂与Ａｇ（Ｉ）形成１：１的黄色配合物，其对试剂空白在４７８ｎｍ和５４８ｎｍ有最大和最负吸收峰，双波长法光度测定时，表观摩尔吸光系数为１．１×１０＾５。符合比耳定律的线性范围为０￣１２μｇ／２５ｍｌ。
l-(4-Antipyrinyl)-3-(2,4-dinitrophenyl)-triazene(APDNBT) is a new reagent. Its colour reaction with silver (Ⅰ) was studied. At a pH of 10. 5- 12. 5 and in the presence of Tween-80 silver forms a yellow complex with the reagent. The composition of the complex is M : R = l : 1. Under this condition, the maximum absorption and the minimum absorption are located at 478nm and 548nm respectively. The apparent molor absorptivity is 1. 1×105L· mol-1·cm-1, and Beer' s law is obeyed in the range of 0-12μg/25ml. Traces of silver in developing solution were determined by the proposed method, and its relative standard deviation (n = 5) is less than 3. 3%.
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
1997年第5期201-203,共3页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
关键词
双波长法
银
APDNBT
显色反应
分光光度法
1- (4-Antipyrinyl)-3- (2,4-dinitrophenyl)-triazene Dual-wavelength spectrophotometry Silver
