乙醇-硫酸铵-1-(2-吡啶偶氮)-2-萘酚双水相萃取铅(Ⅱ)  

Extraction of lead (Ⅱ) by ethanol-ammonium sulfate-PAN aqueous two-phase

作　　者：董红敏[1] 沈亮亮[1] 李雪[1] 张树贵[1] 陈腾[1] 覃事栋[1] 

机构地区：[1]吉首大学化学化工学院,吉首416000

出　　处：《分析试验室》2013年第11期104-107,共4页Chinese Journal of Analysis Laboratory

基　　金：吉首大学研究生科研创新项目(JGY201315)资助

摘　　要：摘要：研究了乙醇溶液在（NH4）2SO4存在下，螯合剂1-（2-吡啶偶氮）-2-萘酚（PAN）与碘化铅络阴离子形成的缔合物在该体系中两相间的分配行为。形成的该缔合物的最大吸收波长为499nm，与PAN和乙醇溶液的混合液相比，发生了34nm的红移。方法测定Pb^2＋的线性范围为0—2．0txg／mL，线性相关系数为0．999，表观摩尔吸光系数8为O．95×10^5L·mol～·cm～。Pb（11）在pH4．6缓冲溶液中可被乙醇相完全萃取，而干扰离子Mn^2＋，Ni^2＋，Al^2＋，Co^2＋基本上不被萃取，实现了Pb“与上述离子的分离。The distribution behavior was studied between a chelating agent PAN （1-（2-pyridine azo）-2- naphthol） and a [ PbI4 ]2-ion complex in the medium of ethanol water solution of （NH4 ）2SO4. Results showed that the maximum absorption wavelength of the association compound was 499 nm, which was a red shift of 34 nm vs the mixture solution of PAN-C2 H50H-H2O. The linear range of calibration curve was 0 -2. 0 ~g/mL with the linear correlation coefficient of 0. 999, and the apparent molar absorbance ~ was 0. 95 ~ 105 L ~ mol-1 . cm-I Pb （ II ） could be completely extracted by ethanol phase in pH 4. 6 buffer solution. The interference ions Mn^2＋ , Ni^2＋ , Al^3＋ and Co^2＋ was not been extracted, and Pb^2＋ could be separated completely from the above concomitant ions.

关 键 词：双水相萃取 分离 铅 1-(2-吡啶偶氮)-2-萘酚 

分 类 号：O652.6[理学—分析化学]