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Switching of ion selectivity of membranes by lipophilic ionic sites

✍ Scribed by Wojciech Wróblewski; Zbigniew Brzózka

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
499 KB
Volume
326
Category
Article
ISSN
0003-2670

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✦ Synopsis

Potentiometric

anion and cation selectivities of PVC membranes based on a thioamide calix[4]arene derivative are described. The influence of the internal electrolyte and membrane composition on ion selectivities were determined. Membranes without added lipophilic salts showed high selectivity for perchlorates over other anions with linear responses in the range of pC104-l-5 with a slope of 58.6mVxdecadeF'.

Addition of potassium tetrakis[3,5-bis(trifluoromethyl)phenyllborate (KTFPB) gave good selectivities of membranes towards lead(I1) cations with a near-Nemstian slope of the Pb(II) response. We showed that a proper choice of lipophilic salts, plasticizer for membrane preparation and the membrane conditioning can alter and moderate the ion selectivity.

📜 SIMILAR VOLUMES

Lipophilicity of tetraphenylborate deriv
Lipophilicity of tetraphenylborate derivatives as anionic sites in neutral carrier-based solvent polymeric membranes and lifetime of corresponding ion-selective electrochemical and optical sensors
✍ Eric Bakker; Ernö Pretsch 📂 Article 📅 1995 🏛 Elsevier Science 🌐 English ⚖ 985 KB

The leaching process of lipophilic anionic additives (e.g., tetraphenylborates) from neutral carrier based membranes into an aqueous sample is quantified. While the necessary lipophilicity (i.e., equilibrium partition coefficient) of the additive for a certain lifetime of the sensor is identical to