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Chemosensors 2015, 3(4), 284-294; doi:10.3390/chemosensors3040284

Plasticizer Effects in the PVC Membrane of the Dibasic Phosphate Selective Electrode

Department of Craniofacial Biology, School of Dental Medicine, University of Colorado, 12800 E. 19th Avenue, MS 8310, Aurora, CO 80206, USA
Academic Editor: Johan Bobacka
Received: 23 July 2015 / Revised: 3 December 2015 / Accepted: 8 December 2015 / Published: 11 December 2015
(This article belongs to the Special Issue Ionophore-Based Potentiometric Sensors)
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Abstract

The PVC membrane of an ion-selective electrode (ISE) sensitive to dibasic phosphate ions (HPO4-ISE) has not been optimized for maximum selectivity, sensitivity, and useable ISE lifetime and further work was necessary to improve its performance. Two areas of investigation are reported here: include the parameters for the lipophilicity of the plasticizer compound used and the amount of cyclic polyamine ionophore incorporated in the PVC membrane. Six candidate plasticizers with a range of lipophilicity were evaluated for their effect on the useable lifetime, sensitivity, and selectivity of the ISE against 13 different anions. Selectivity was determined by a modified fixed interferent method, sensitivity was determined without interferents, and the usable lifetime evaluated at the elapsed time where 50% of the HPO4-ISE failed (L50). The results show that choosing a plasticizer that has a lipophilicity similar to the ionophore’s results in the best selectivity and sensitivity and the longest L50. View Full-Text
Keywords: ion-selective electrode; chemical sensor; phosphate; plasticizer; lipophilicity; liquid membrane; sensitivity; selectivity ion-selective electrode; chemical sensor; phosphate; plasticizer; lipophilicity; liquid membrane; sensitivity; selectivity
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Carey, C. Plasticizer Effects in the PVC Membrane of the Dibasic Phosphate Selective Electrode. Chemosensors 2015, 3, 284-294.

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