苯并噻唑重氮氨基偶氮苯与银显色反应的研究

研究了新显色剂苯并噻唑重氮氨基偶氮苯（ＢＴＤＡＢ）与Ａｇ（Ⅰ）的双波长光度法的显色反应．实验结果表明，在ＴｒｉｔｏｎＸ１００及三乙醇胺存在下，于ｐＨ值约为１０５的Ｎａ２Ｂ４Ｏ７－ＮａＯＨ缓冲溶液中，试剂与Ａｇ（Ⅰ）可形成络合比为２∶１的稳定的紫红色络合物．该络合物在５３５ｎｍ和４４０ｎｍ处分别存在最大吸收和最负吸收，显色反应的表观摩尔吸光系数可达８５３×１０４Ｌ·ｍｏｌ－１·ｃｍ－１，Ａｇ（Ⅰ）量在０～０．５２ｍｇ·Ｌ－１范围内符合比尔定律．方法用于定影液及显影液中Ａｇ（Ⅰ）的直接测定

Colour Reaction of Chromogenic Reagent\= Benzothiazolyldiazoaminoazobenzene with Silver ()

Benzothiazolyldiazoaminoazobenzene(BTDAB)is a new reagent.Its colour reaction with silver () was studied.At pH of 10.3010.70 and in the presence of triton X100 and triethanolamine silver forms a purplered complex with the reagent.The composition of the complex is MR=12.Under this condition the maximum absorption and the minimum absorption are located at 440 nm and 535 nm respectively.The apparent molor absorptivity is 8.5310\ 4 L\5mol\ \{-1\}\5cm\ \{-1\},and Beers law is obeyed in the rang of 00.52 mg\5L\ \{-1\}.This method is employed to determine trace amounts of silver in fixing solution and developer solution with satisfactory results.