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SENSORS

Construction of Strontium PVC-Membrane Sensor Based on Salicylaldehyde Thiosemicarbazone

Pages 1850-1866 | Received 17 Mar 2008, Accepted 03 Apr 2008, Published online: 16 Jun 2010
 

Abstract

This work introduces a unique ionophore for the selective determination of Sr2+ ions. The ionophore, salicylaldehyde thiosemicarbazone (ST), presented a high affinity toward the strontium cations. The demonstrated characteristics of the sensor included a linear dynamic range between 1.0 × 10−6 and 1.0 × 10−2 M with a near Nernstian slope of 29.4±0.5 mV per decade, a detection limit of 4.8 × 10−7 M, and a very good selectivity for Sr2+ over other cations in a wide pH range (2.8–10.4). The sensor possessed the advantages of short conditioning time, fast response time (< 10 s), and, especially, good selectivity toward the transition and heavy metal ions as well as some mono, di, and trivalent cations. Concerning the electrode lifetime, no considerable potential divergence was noticed for at least 10 weeks. The developed sensor was successfully used as an indicator electrode in the Sr2+ titration with EDTA from binary mixtures, and the Sr2+ monitoring in mixtures of three and five different ions.

The authors gratefully acknowledge the financial support from the Research Council of the Quchan Islamic Azad University for this research.

Notes

a Results are based on three measurements.

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