新显色剂邻磺酸基苯偶氮若丹宁合成及与钯的光度法研究  

SYNTHESIS OF o-SULPHOBENZENAZORHODANINE AND SPECTROPHOTOMETRIC STUDY ON ITS REACTION WITH PALLADIUM

作　　者：沈绍典[1] 崇秀华[1] 

机构地区：[1]华东师大化学系,上海200062

出　　处：《理化检验（化学分册）》1997年第4期155-157,共3页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

摘　　要：报道了新显色剂邻磺酸基苯偶氮若丹宁（o-SBAR）的合成及其与钯显色反应的性能。在2.4mol· L^(-1)磷酸介质中,试剂与钯形成 1: 1的桔红色配合物,在 520nm波长处配合物有最大吸收,表观摩尔吸光系数为6.65×10~4,反应速度快,选择性高,应用于钯碳催化剂中钯的测定,结果满意。In this paper the synthesis of o-sulphobenzenazorhodanine (o-SBAR) and spectrophotome-tric study on its reaction with palladium was reported. In H3PO4(1+1) medium, palladium forms an orange-red complex with o-SBAR which has an absorption maximum at 520nm. The apparent molar absorptivity is 6. 65×104L·mol-1·cm-1. Beer's law is obeyed for palladium in the range of 4-16μg/25ml. A considerable excess of alkali, alkaline-earth and non-ferrous metals does not interfere with the determination. The method is simple and rapid. It has been applied to the determination of palladium in catalysts with satisfactory results.

关 键 词：光度法 钯 显色剂 SBAR 特效试剂 

分 类 号：TQ421.33[化学工程] O614.823[理学—无机化学]