正丙醇析相萃取BiI_4^-络阴离子的研究  

Study on extraction of anionic complex BiI_4^- by phase separation with n-propyl alcohol

作　　者：翟秋阁[1] 杨秀清[2] 冯迎晖[1] 王攀[1] 马万山[1] 

机构地区：[1]信阳师范学院化学化工学院,河南信阳464000 [2]新乡学院化学与化工学院,河南新乡450052

出　　处：《冶金分析》2010年第3期68-71,共4页Metallurgical Analysis

基　　金：河南省教育厅自然科学研究计划项目(2006150023)

摘　　要：试验了在氯化钠存在下,Bi3+以BiI4-络阴离子萃取到正丙醇相的最佳条件。结果表明,氯化钠能使正丙醇的水溶液分成两相,在分相过程中,Bi3+与碘化钾生成的BiI4-与质子化正丙醇(C3H7OH2+)形成的缔合物[BiI4-][C3H7OH2+]能被正丙醇相完全萃取。当正丙醇、碘化钾和氯化钠的浓度分别为30%(V/V)、6.0×10-3mol/L、0.2 g/mL时,Bi3+的萃取率达到99.2%以上,Fe2+、Co2+、Ni2+、Ag+、Mn2+、Cr3+、Ce3+、Zn2+和Al3+基本不被萃取,实现了Bi3+与上述金属离子的分离,对合成水样和锌铋合金中Bi3+的分离和测定,结果满意。The optimum conditions were studied for the extraction of Bi^3＋ into n-propyl alcohol phases in the form of anionic complex BiI4^- in the presence of sodium chloride. The results showed that the n-propyl alcohol -water solution could be well divided into two phases by sodium chloride. The associated [BiI4^][C3H7OH2 ^＋] formed with C3 H7OH2^ ＋ and BiI4^- （combined from Bi^3＋ and potassium iodide） could be completely extracted during this process. Bi^3＋ could be quantiatively separated from Fe^2＋ , Co^2＋ ,Ni^2＋ , Ag^＋ ,Mn^2＋ ,Cr^3＋ , Ce^3＋ , Zn^2＋ and Al^3＋ by extraction at the extraction rate of Bi^3＋ over 99.2%, when the concentrations of n-propyl alcohol, potassium iodide and sodium chloride in solution are 30%（V/V）, 6.0× 10^- 3 mol/L and 0. 2 g/mL, respectively. This method was applied to the extraction separation and determination of bismuth in synthetic water and Zn-Bi alloy with satisfactory results.

关 键 词：铋 正丙醇 碘化钾 氯化钠 萃取分离 

分 类 号：O658.2[理学—分析化学]