为了观察PVC敏感膜各成分在对离子识别时发生的变化,应用傅立叶变换-衰减全反射红外光谱研究了含有二苯并24冠8的PVC敏感膜对多种离子的识别作用。傅立叶变换-衰减全反射红外光谱显示,在PVC敏感膜与浓度为0.1mol/L的CdSO4、ZnSO4、Pb(NO3)2、Na2SO4、KCl、NaCl溶液分别反应后,归属于二苯并24冠8的吸收峰,峰高明显增高,其他一些吸收峰也有增高;而PVC敏感膜与浓度为0.1mol/L的Li2SO4、MgCl2分别反应后,PVC敏感膜各吸收峰无显著变化。还讨论了影响识别作用的一些因素,如反应时间、阴离子的作用、敏感膜发生识别作用的位置。结果表明:含有二苯并24冠8的PVC敏感膜对不同离子有选择识别的作用,可选择识别Cd2+、Zn2+、Pb2+、K+、Na+,不能识别Li+、Mg2,PVC敏感膜中的中性离子载体二苯并24冠8对离子的识别起主要作用,四(4—氯苯)硼钾也参与了识别作用。

To observe what have been taken place when pvc sensitive membrane reacted with some cations in water,attenuated total reflectance Fourier transform infrared spectrometry(FTIR-ATR),have been used to study the selective recognition of pvc sensitive membrane incorporated dibenzo 24–crown-8 when it reacted with some special ion in water.The FTIR-ATR spectrum showed the peaks responsible for dibenzo 24–crown-8,and some other peaks,have been changed higher,after the pvc sensitive membrane reacted with 0.1 mol/L CdSO4,ZnSO4,Pb(NO3)2,Na2SO4,KCl and NaCl solution respectively. But have been not changed anymore,after the pvc sensitive membrane reacted with 0.1mol/L Li2SO4and MgCl2solution respectively.And some influence factors,such as reaction time,counter anion,reaction position of pvc sensitive membrane,also have been discuussed.The results indicated the pvc sensitive membrane can selective react with Cd2+,Zn2+,Pb2+,K+and Na+,can not react with Li+,Mg2+.When the selective reaction taken place,dibenzo 24–crown-8 on pvc sensitive membrane have been changed more,the lipophilic ionic sites reagent potassium tetrakis(4-chlorophenyl)borate changed too.