新试剂2-(5-硝基-2-吡啶偶氮)-5-二甲氨基苯甲酸分光光度法测定微量钴  

Spectrophotometric Determination of Micro Amount Cobalt Using a New Chromogenic Reagent 2-(5-Nitro-2-Pyridylazo)-5-Dimethylaminobenzoic Acid

作　　者：童岩[1] 刘绮萍[1] 刘锦春[1] 程介克[1] 

机构地区：[1]武汉大学化学系,武汉430072

出　　处：《分析试验室》1993年第5期25-27,共3页Chinese Journal of Analysis Laboratory

摘　　要：本文报道用新试剂2-(5-硝基-2-吡啶偶氮)-5-二甲氨基苯甲酸分光光度法测定微量钴。配合物的表观摩尔吸光系数为1.31×10~5L·mol^(-1)·cm^(-1),Co∶5-NO_2-PAMB=1∶2,Co浓度在0～14μg/25mL范围内服从比耳定律。用于金属有机化合物中微量钴的测定,结果与理论值相符。The spectrophotometric determination of micro amount cobalt using a new chromogenic reagent 2-(5-nitro-2-Pyridylazo)-5-dimethylaminobenzoic acid (5-NO_2-PAMB) is reported in this paper. The apparent molar absorptivity of the coordination complex is 1.31×10~5L·mol^(-1)·cm^(-1) at 650nm with Co:5-NO_2-PAMB=1:2. Beer's law is obeyed in the range of 0～14μg/25mL Co. This sensitive method has been applied to determine cobalt in organometallic compounds,and the results accord with theoretical values.

关 键 词：钴 分光光度法 吡啶偶氮 

分 类 号：O614.812[理学—无机化学]