双显色剂协同效应分光光度法研究银－1．10邻二氮菲－溴酚蓝－亚甲蓝体系测定银（Ⅰ）

本文研究了利用溴酚蓝（ＢＰＢ）与亚甲蓝（ＭＢ）所形成的等色染料离子对萃取测定银的方法。用酸将１．２－二氯乙烷中的Ａｇ（ｐｈｅｎ）＿２（ＢＰＢ）解析后，向其中加入与溴酚蓝颜色相近的亚甲蓝，利用１．２－二氯乙烷中溴酚蓝、亚甲蓝的染料离子对提高了测定银的灵敏度，其摩尔吸光系数ε＝１．１３×１０￣５Ｌ／ｍｏｌ／ｃｍ，银量在０～６×１０￣（－６）ｍｏｌ／Ｌ的范围内符合比耳定律。本法用于定影液中银的测定，结果满意。

Spectrophotometric Study on Simuitaneous Effectith Bino-developers Determination of Silver(Ⅰ)by Spectrometry with Phen-BPB-MB System

In this paper, an extractive spectrophotometric method for the determina-tion of Ag(Ⅰ)with isochromatic dye ion-pair formed by bromophenol bluc and methyleneblue was reported. After the complax Ag(phen)_2]_2 BPB was decomposed in1.2-dichloroethane with acid solution, to the aqueous phase was added methylene bluewhich is similar in color to bromophenol blue. The sensitivisity in the determination of sil-ver was enhanced with isochromatic dye ion-pairmin 1.2-dichloroethane. The molarabsorptivity is 1.13 × 10￣5 L/mol/cm and beer's law holds between 0～6× 10￣(-6)mol/ L.The method had been applied to the determination of silver(Ⅰ)in fixing agent and the re-sults were satisfactory.