乙醇-盐-水-5-Br-PADAP体系中萃取分离测定钌  

Extraction Separation and Determination of Ruthenium in Ethanol-salt-water-5-Br-PADAP System

作　　者：杜惠蓉[1] 

机构地区：[1]达县师范高等专科学校化学系,四川达州635000

出　　处：《四川师范大学学报（自然科学版）》2005年第5期594-597,共4页Journal of Sichuan Normal University（Natural Science）

摘　　要：研究了在硫酸铵存在下,5-Br-PADAP乙醇体系中Ru(Ⅲ)、Pd(Ⅱ)的萃取行为以及乙醇溶液的分相条件,讨论了影响萃取率的各种因素,实验表明:85℃水浴中,pH5.5～6.5内,该体系中Ru(Ⅲ)可完全被乙醇相萃取,但室温下,pH1.0～7.0内,Pd(Ⅱ)萃取率可达100%,而Ru(Ⅲ)不能被萃取,因此可实现Ru(Ⅲ)、Pd(Ⅱ)混合离子的定量分离,同时建立了钌的测定方法.pH5.80时,乙醇相中Ru(Ⅲ)-5-Br-PADAP配合物的表观摩尔吸光系数约为1.081×105L·mol-1·cm-1,Ru(Ⅲ)含量在0～8.00μg/10mL内符合比尔定律,检出限为0.012μg/mL.该法用于混合样中钌的分离测定,结果满意.The extraction behavior of Ru （ Ⅲ ） and Pd （Ⅱ） in the system of C2H5OH-sah-H2O-5-Br-PADAP in the presence of （N/Lt）2SO4,and conditions of phase-separation in C2H5OH-H2O solution were studied. All factors influencing the rate of extraction were also discussed. It was shown that Ru （Ⅲ） could be extracted into C2H5OH in the solution system mentioned above when the water was heated to 85 ℃ and pH was equal to 5.5- 6.5; at normal temperature and pH was equal to 1.0 - 7.0, the extraction rate of Pd （Ⅱ） was 100% ,but Ru （Ⅲ） could not be extracted. Based on this phenomenon, not only the separation ofRu （Ⅲ） from Pd （Ⅱ） was achieved, but also photometric determination of Ru （Ⅲ） with 5-Br PADAP was feasible. Apparent molar absorptivity of Ru （Ⅲ）-5-Br-PADAP complex in ethanol phase was found to be 1.081×10^5 L·mol^-1·cm^-1. Beer＇ s law was obeyed in the range of 0-8 . 00μg of Ru （Ⅲ） in 10 mL of solution, with a detection hmit of 0.012μg/mL. The method has been applied to the determination of Ru （Ⅲ） in the mixture samples with satisfactory results.

关 键 词：钌 5-BR-PADAP 硫酸铵 萃取分离 乙醇 

分 类 号：O658.2[理学—分析化学]