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Proceedings Paper

Ion-selective electrodes sensitive to anions based on epoxy resins
Author(s): Marek Trojanowicz; Wioletta Opara
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Paper Abstract

The anion sensing properties of potentiometric sensors prepared by formation of 50 micrometers layer of epoxy resin on a metallic silver support have been examine. Experimental work was carried out for three different resins of various origin commercially available. For all examine resins the sensitivity of potentiometric sensors was examined for 14 different inorganic and organic anions in micro- and milimolar range of concentration. A range of linear response, slope of response, reproducibility of functioning and response time was examined for each measuring ion. In a large majority of tested cases the slope of the calibration curves for both mono- and divalent ions was very close to Nerstian ones, with deviations sporadically exceeding g10 percent. In almost all cases the linearity range of response was found down to 10 (mu) M level of concentration. Response time of epoxy resin sensors to anions is similar to that observed for common solid-state membrane electrodes. For concentration change between 1 and 10 mM the 95 percent of steady-state response was obtained within 30 to 90 s depending on the kind of resin. The selectivity of potentionmetric response is significantly different fro examine resins. The observed selectivity pattern in each case is different than typical one according to lipophilicity of sensed anions or free energy of hydration that is exhibited by conventional ion-exchangers with anion exchange ammonium groups.

Paper Details

Date Published: 14 September 2001
PDF: 5 pages
Proc. SPIE 4414, International Conference on Sensor Technology (ISTC 2001), (14 September 2001); doi: 10.1117/12.440182
Show Author Affiliations
Marek Trojanowicz, Warsaw Univ. (Poland)
Wioletta Opara, Warsaw Univ. (Poland)


Published in SPIE Proceedings Vol. 4414:
International Conference on Sensor Technology (ISTC 2001)

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