介体溶剂在碱金属PVC膜离子电极中选择性的研究

Study on Selectivities of PVC Membranes with Different Mediator Solvents for Alkali Metal Ions

近年来,文献报道了几种Li+、Cs+等离子交换剂PVC膜电极.这类电极对离子的选择性除同活性物质本身的性质有关,还与介体溶剂的性质有关系.本文考察了不同介体溶剂的四苯硼酸盐PVC膜对碱金属离子的选择性,探讨了不同介体溶剂的膜对选择性的影响.所得结果有助于研制性能良好的碱金属离子选择电极.

With different mediator solvents,such as di-(n-octyl)phenylphosphonate(DOPP),tributyl phosphate(TBP),nitrobenzene,o-nitrophenyl-n-octylether(o-NPOE),dioctylphthalate(DOP)and dibutyl sebacate(DBS),selectivities of PVC membranes for alkalimetal ions were measured.The factors affecting selectivities of sensitive membraneswere investigated by measuring equivalent conductances of tetraphenylborates indifferent mediator solvents.The conclusions obtained agreed with experimental results.AS a mediator solvent nitroaromatics are suitable for alkali metal ions with largerradii,and phosphonates are favourable for alkali metal ions with smaller radii.