Lead-selective membrane electrodes based on neutral carriers. Part I. Acyclic amides and oxamides
- 1 January 1990
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in The Analyst
- Vol. 115 (8) , 1085-1087
- https://doi.org/10.1039/an9901501085
Abstract
A group of amides and oxamides has been used as potential ionophores for lead ions in solvent polymeric membrane electrodes. The most favourable analytical results (slope, log kPb,M and lifetime) were obtained with membranes incorporating ionophore ETH 295 and potassium tetrakis(p-chlorophenyl)borate. With the use of these membranes: (i) a linear response with a slope of 35.3 mV per pPb unit in PbII and an activity range of 10–5.2–10–1.0 M were obtained; (ii) the selectivity factors (log kPb,M) were lower than –1.5 with respect to the ions studied (with the exception of Ag+ and H+ ions); (iii) the electrodes can be used with no change in their properties for at least 2 months.Keywords
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