摘要
本文研究了偶氮肿Ⅲ作为萃取剂和显色剂,在PEG—ArsenazoⅢ—Na_2SO_4体系中的非有机溶剂萃取光度法测定钯。将配合物从P^H3.5(HAc～NaAc缓冲溶液)的溶液中萃取至PEG相,其最大吸收波长位于610nm,摩尔吸光系数为5.0×10~4L·mol^(-1)·cm^(-1),Pd(11)的线性范围为0～4μg/ml,Pd(11)与ArsenazoⅢ的配合比为1:2。将方法用于C—Pd催化剂中钯的测定,获得满意结果。
In PEG-Arseazo Ⅲ-Na2SO4 system,the extraction-spectrophotometric determination of palladium by using Arsenazo Ⅲ as extractant and color agent with non-organic solvents is studied. The complex is extracted by PEG phase from the water solution of PH3.5 (HAc-NaAc) ,The maxmum absorption of the complex is at 610 nm and the molar absorptivity 5.0×1041·mol-1 cm-1. Beer's law was obeyed in the range of 0-4mg/ml Pd(11). The palladium and arsenazo Ⅲ form a stable complex with a malar ratio of 1:2 . The proposed method has been applied to the determination of pallaclium in Carbon-palladium Catalyst with satisfactory result.
关键词
钯
萃取光度法
非有机溶剂
聚乙二醇
偶氮胂Ⅲ
palladium
Arsenazo III
Extraction-Spectrophotomhry
non-organic solvent
polyethylene glyeol (PEG)
