摘要
本文报道了钯与4-(2-吡啶偶氮)间苯二酚(PAR=H_2R,下同)和四苯钟离子形成离子缔合物的化学条件,经氯仿萃取后,建立了一种测定微量钯的萃取光度法。萃取的最佳pH为4.4,络合物的化学式为[(C_6H_5)_4As^+,PdClR^-],其最大吸收峰波长为532nm,表观摩尔吸光系数e_(532)=3.3×10~4L·mol^(-1)·cm^(-1),10mL萃取液中钯量在0～25μg内遵守比耳定律。方法简便,选择性好,用于催化剂中钯的测定,结果满意。
The spectrophotometric determination of palladium (Ⅱ) with 4-(2-pyridylazo) resorcinol(PAR=H_2R) and tetraphenylarsonium salt was studied. The coloured complex can be preferably extracted by chloroform. The maximum absorbance of the extract occurs at 532nm (pH3. 5 ～6. 0). The molar absorptivity at 532nm is 3. 3×10~4L·mol^(-1)·cm^(-1). The complex is stable for 38 hours. Beer's law is obeyed for palladium (Ⅱ) in the range of 0～ 25μg/10mL. The interference of foreign ions and salts was examined. It has been proved that the ratio of the constituents of the complex,Pd:Cl:R: (C_6H_5)_4As = 1:1: 1:1, in the organic phase, whose chemical formula is [(C_6H_5)As^+,PaCl R^+] (R^(2-)=C_(11)H_7N_3O_^(2-)).
出处
《分析试验室》
CAS
CSCD
北大核心
1991年第6期26-28,共3页
Chinese Journal of Analysis Laboratory
基金
国家自然科学基金
关键词
钯
萃取光度法
离子络合物
测定
Palladium Determination
Spectrophotometry
4-(2-Pyridylazo) Resorcinol
Tetraphenylarsonium
