Ion-selective compositions which comprise an ionophore, a compound capable of solvating the ionophore and a supporting matrix are disclosed. The ionophores useful in these compositions are certain crown ethers. These ion-selective compositions are particularly useful in ion-selective membranes and electrodes which are capable of selectively transporting a first ion in preference to a second ion. Such compositions, membranes and electrodes are useful for potentiometric measurement of alkali metal ions, e.g. lithium, sodium and potassium, in aqueous solutions, e.g. biological fluids. Dry-operative electrodes using these ion-selective compositions as membranes are also disclosed.
本文介绍了一种离子选择性组合物,包括离子载体、能够溶解离子载体的化合物和支持基质。在这些组合物中有用的离子载体是某些
冠醚。这些离子选择性组合物特别适用于能够优先选择第一离子而不是第二离子的离子选择性膜和电极。这样的组合物、膜和电极对于测量
水溶液中的碱
金属离子,例如
生物体液中的
锂、
钠和
钾,具有很好的电位测量效果。本文还介绍了使用这些离子选择性组合物作为膜的干操作电极。