基于1-丁基-3-甲基咪唑十二烷基硫酸盐为活性物质的PVC膜电极的性能及其应用

The ion-selective PVC membrane electrode based on 1-butyl-3-methylimidazolium dodecyl sulfate

以离子液体1-丁基-3-甲基咪唑六氟磷酸盐(BmimPF6)为活性物质制得离子选择性电极,该电极对离子液体BmimCl有较好的电位响应,线性响应浓度范围为1×10-5mol/L～1×10-2mol/L.用十二烷基硫酸钠(SDS)与BmimPF6进行阴离子交换制得的1-丁基-3-甲基咪唑十二烷基硫酸盐(BmimDS)作为活性物质,能降低电极的检测下限,线性响应浓度范围拓展为1×10-6～1×10-2mol/L.该电极显示出良好的稳定性和重现性.此外,该电极可作为电位滴定法的指示电极用于对四丁基氯化铵(TBACl)、十二烷基硫酸钠(SDS)的滴定分析.

Ion selective electrode using BmimPF6 as active material was fabricated.The electrode showed a good response to ionic liquid BmimCl,with linear response range from 1×10^-5 mol/L to 1 ×10^-2 mol/L.With 1-butyl-3-methylimidazolium dodecyl sulfate（BminDS） as active material,could further reduce the electrode detection limit,and the linear response range expanded to be 1×10^-6 -1×10^-2 mol/L.The electrode showed good stability and reproducibility.The electrode was also used as the sensing electrode in the potentiometric titration of tetrabutylammonium chloride and SDS.