Alkali metal ion-selective compositions and elements and a...

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B - Operations, Transporting

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403/2, 324/28

B01J 45/00 (2006.01) G01N 27/30 (2006.01) G01N 27/333 (2006.01)

Patent

CA 1221198

-i- ALKALI METAL ION-SELECTIVE COMPOSITIONS AND ELEMENTS AND A METHOD OF USING SAME ABSTRACT OF THE DISCLOSURE Ion-selective compositions which comprise an ionophore, a compound capable of solvating the iono- phore 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 trans- porting 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.

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