5-NO_2-PADAT光度法同时测定钴、铑、钯的研究  

Study on the simultaneous determination of cobalt, rhodium and palladium with 5-NO_2-PADAT

作　　者：孙家娟[1] 刘彬[1] 王晓玲[1] 杨连利[1] 董荣欣[1] 

机构地区：[1]咸阳师范学院化学系,咸阳712000

出　　处：《分析试验室》2004年第1期57-60,共4页Chinese Journal of Analysis Laboratory

基　　金：陕西省教育厅专项科研计划项目 (0 0JK13 2 )

摘　　要：提出了以 5 (5 硝基 2 吡啶偶氮 ) 2 ,4 二氨基甲苯 (5 NO2 PADAT)作为钴、铑、钯同时测定的新试剂 ,在 586nm处 ,钴、铑、钯与试剂形成的配合物的吸光度具有良好的加和性。基于该试剂与钴、铑、钯显色反应温度和酸度的差异 ,建立了钴、铑、钯同时测定的新方法。方法灵敏度为ε586Co =1 .46×1 0 5L·mol-1 ·cm-1 ;ε586Rh =1 .63× 1 0 5L·mol-1 ·cm-1 ;ε586Pd =9.5×1 0 4L·mol-1 ·cm-1 。钴质量浓度在 0～ 0 .30 μg mL、铑质量浓度在 0～ 0 .60 μg mL、钯质量浓度在 0～ 0 .95μg mL范围内服从比耳定律。已用于合成样中微量钴、铑、钯的同时测定。A new method for simultaneous spectrophotometric determination of cobalt, rhodium and palladium was established using 5-(5-nitro-2-pyridylazo)-2,4-diaminotoluene (5-NO_2-PADAT) as chromogenic reagent. In 3.0 mol/L H_2SO_4 solution, the absorbance of cobalt, rhodium and palladium complex showed very good spectral additive property at 586 nm. The apparent molar absorptivity of the cobalt, rhodium and palladium complex were 1.46×10~5, 1.63×10~5 and 9.5×10~4 L·mol^(-1)·cm^(-1) at 586 nm, respectively. Beer′s law was obeyed in the rang of 0～0.30 μg/mL for Co, 0～0.60 μg/mL for Rh and 0～0.95 μg/mL for Pd. The method was applied to the determination of trace cobalt, rhodium and palladium in synthetic samples with satisfactory results.

关 键 词：钴 铑 钯 同时测定 含量测定 5-NO2-PADAT光度法 5-(5-硝基-2-吡啶偶氮)-2 4-二氨基甲苯 

分 类 号：O614.812[理学—无机化学] O614.82[理学—化学]