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PVC membrane lithium-selective electrodes based on oligomethylene-bridged bis-1,10-phenanthroline derivatives

✍ Scribed by Sun Li-Xian; Tatsuhiro Okada; Jean-Paul Collin; Hideki Sugihara

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
622 KB
Volume
329
Category
Article
ISSN
0003-2670

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✦ Synopsis

Poly(viny1 chloride) (PVC) membrane electrodes are prepared for lithium, based on several kinds of synthesized oligomethylene bridged bis-1, lo-phenanthroline derivatives as neutral carriers. Potassium tetrakis@-chlorophenyl)borate (KTCPB) and tetrakis(p-fluorophenyl)borate (TPPB) as lipophilic salts were added into the membranes to improve the selectivity for lithium over alkali and alkaline earth metal ions. The effects of different plasticizers on the electrode performance are discussed. The relationship between the impedance of electrodes and their performance are analyzed, and the membrane composition of the electrode was optimized. The electrode with the optimal membrane composition showed a logKp,, value of -3.2 (1700 times more selective to lithium ion over sodium ion).

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The catlomc selectlvlty and electrode characteristics of poly(vmy1 chloride) (PVC) membranes based on bls[(3n + 1)crown-n] ethers are dlscussed The electrodes exhibit Nernstlan responses over the sodium ion actlvlty range 1 X 10m5 -1 M and can be applied over the pH range 2-10 The sodium selectlvlty