Plasticizer Effects in the PVC Membrane of the Dibasic Phosphate Selective Electrode
AbstractThe 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
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Carey, C. Plasticizer Effects in the PVC Membrane of the Dibasic Phosphate Selective Electrode. Chemosensors 2015, 3, 284-294.
Carey C. Plasticizer Effects in the PVC Membrane of the Dibasic Phosphate Selective Electrode. Chemosensors. 2015; 3(4):284-294.Chicago/Turabian Style
Carey, Clifton. 2015. "Plasticizer Effects in the PVC Membrane of the Dibasic Phosphate Selective Electrode." Chemosensors 3, no. 4: 284-294.