铑(Ⅲ)与5-(5-硝基-2-吡啶偶氮)-2,4-二氨基甲苯的极谱催化氢波研究  

Study on the Polarographic Catalytic Hydrogen Wave of the Rhodium(Ⅲ) with 5-(5-nitro-2-pyridylazo)-2,4-diaminotoluene

作　　者：孙家娟[1] 刘彬[1] 张君才[1] 白育伟[1] 高峰柱[1] 

机构地区：[1]咸阳师范学院化学系,陕西咸阳712000

出　　处：《分析科学学报》2003年第4期336-338,共3页Journal of Analytical Science

基　　金：陕西省教育厅专项科研计划项目(00JK132)

摘　　要：本文研究了铑( )与5-(5-硝基-2-吡啶偶氮)-2,4-二氨基甲苯(5-NO2-PADAT)配合物的极谱行为,发现在pH=5.00HAc-NaAc缓冲溶液中,配合物于-1.20V(vs.SCE)处产生一灵敏的极谱催化氢波。基于此,建立了测定痕量铑的新方法。该催化氢波峰电流i′p与铑( )浓度在2.0×10-3～1.8×10-2μg/mL范围内呈线性关系,检出限为1.0×10-3μg/mL。研究了该催化氢波的性质及其反应机理。The polarographic behavior of rhodium(Ⅲ)with 5(5nitro2pyridylazo) 2,4diaminotoluene (5NO2PADAT) has been studied. In 0.40 mol/L HAcNaAc(pH=5.00) buffer solution, a highly sensitive complex catalytic hydrogen wave of Rh(Ⅲ)5NO2PADAT was obtained by using singlesweep polarograph. The first order derivative peak current of the catalytic hydrogen wave was linearly proportional to rhodium concentration in the range of 2.0×10-3～1.8×10-2 μg/mL(r=0.9991). The detection limit of Rh(Ⅲ)was 1.0×10-3 μg/mL. It was used to determine trace rhodium in Mgbased catalyst. The characteristic of the catalytic hydrogen wave and the mechanism of electrode reaction were also investigated briefly.

关 键 词：铑(Ⅲ) 5-(5-硝基-2-吡啶偶氮)-2 4-二氨基甲苯 极谱催化氢波 配合物 显色剂 光度分析 

分 类 号：O614.822[理学—无机化学] O657.3[理学—化学]