Azothia- and Azoxythiacrown Ethers as Ion Carriers. Part I. Cationic Response of Membrane Electrodes |
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| Authors: | Katarzyna Wygladacz Elzbieta Malinowska Jolanta Szcztygelska-Tao Jan F. Biernat |
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| Affiliation: | (1) Department of Analytical Chemistry, Faculty of Chemistry, Warsaw, University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland;(2) Department of Chemical Technology, Technical University of Gdansk, 80-952 Gdansk, Poland |
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| Abstract: | 13-Membered azothia- and azoxythiacrown ethers have been applied as ion carriers in ion-selective membrane electrodes. Their sensitivity and selectivity were studied towards alkali, alkaline earth, transition and heavy metal cations. It was found that membranes doped with the azoxythiacrown ether (A) show higher affinity towards Pb2+ than Cu2+ (log KCu,Pbpot = 1.7), whereas membranes with the azothiacrown ether (B) are more selective towards Cu2+ than Pb2+ (log KCu,Pbpot = -2.4). The discrimination of alkali and alkaline earth cations was found to be greater for B than for A. Electrodes with both ionophores suffered from strong interference by Ag+ and Hg2+. The relation between the carrier structure and electrode properties has been discussed. |
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| Keywords: | azoxythiacrown azothiacrown cation carrier membrane electrodes selectivity |
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