✦ LIBER ✦

Mechanistic aspects of the K+ ion selective electrode based on valinomycin-PVC

✍ Scribed by R.D. Armstrong

Publisher: Elsevier Science
Year: 1987
Tongue: English
Weight: 355 KB
Volume: 32
Category: Article
ISSN: 0013-4686
DOI: 10.1016/0013-4686(87)90001-6

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✦ Synopsis

The mechanism of ion selective electrode membranes based on valinomycin+KBPh, in plasticized PVC is discussed in the light of recent impedance studies. In a typical membrane the K + is largely present as K+val -BPh, ion pairs. The transport number for K+val is -0.87 whilst that for BPh4 is -0.13. At the aqueous KCI membrane interface the exchange current for K+ typically exceeds 30 PA cm-z, There is no evidence for any significant take up of water by these membranes, either as water molecules or as water globules containing OH-.

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