摘要
以4-(2-吡啶偶氮)-间苯二酚(PAR)为显色剂,用光度法研究了铼(Ⅶ)在聚乙二醇2000(PEG)-硫酸铵双水相萃取体系中的分配行为。萃取系在有一定量铼标准溶液存在,且含有300g·L^(-1)聚乙二醇2000溶液及300g·L^(-1)硫酸铵溶液各3mL及1g·L^(-1)PAR溶液1mL,并用磷酸盐缓冲溶液控制酸度为pH6.5的溶液中进行。溶液的总体积为10mL,振摇5min后,置于控温30℃的水浴中平衡20h,冷却至室温,分相后,于540nm波长处测量下层的吸光度,从标准曲线求得其铼量并计算萃取率(E%)。试验表明:在所试验的几项因素中,萃取介质的酸度对萃取率的影响最大。
The distribution of rhenium ion the binary aqueous phase extraction system of polyethylene glycol 2000 （PEG） and ammonium sulfate was studied photometrically by the color reaction of Re（Ⅵ） with 4-（2- pyridylazo）-resorcinol （PAR）. A definite amount of standard Re（ Ⅶ ） solution was added to the binary aqueous phase extraction medium containing 3 mL of 300 g ·L-1 PEG solution, 3 mL of 300g·L（-1） （NH4）2SO4 solution and 1 mL of 1g·L（-1） PAR solution, and buffered to pH 6. 5 with PBS. The solution was made up to 10 mL, shaked for 5 min and equilibrated in a water bath at 30 ℃ for 20 h. After cooling to room temperature and phase separation, the absorbance of the lower phase was measured at 540 nm. Its Re content was found from the standard curve and the rate of extraction （EG） was calculated. It was found that acidity of the extraction medium was the most influential factor to the extraction efficiency as compared with other factors.
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
2011年第7期821-822,825,共3页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
