Title:
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Polysulfone as an alternative material to PVC in the design of ion-selective electrodes
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Author:
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González Bellavista, Anna; Macanás de Benito, Jorge; Muñoz Tapia, Maria; Fábregas Martínez, Esteve
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Other authors:
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Universitat Politècnica de Catalunya. Departament d'Enginyeria Química; Universitat Politècnica de Catalunya. POLQUITEX - Materials Polimérics i Química Téxtil |
Abstract:
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Polysulfone (PS), a non-conductive polymer, is employed as an alternative material to polyvinyl chloride (PVC), the most used polymer in the design of ion-selective electrode (ISE) membranes to date.
A nitrate-ISE is chosen as a model electrode to study the efficiency of PS as a polymer matrix of the membrane. Tetra-octyl ammonium nitrate is used as ionophore and 2-nitrophenyl octyl ether as plasticizer. The polymer/plasticizer/ionophore ratio is optimized and the analytical performance parameters of the prepared electrodes are evaluated. The electrodes show a slope between 45 and 60 mV/decade (depending on the calibration medium and membrane composition). A linear range response between 1.0 × 10-4 and 3.0 × 10-2 M, and a lifetime of at least 1 month are obtained. The electrodes exhibit good selectivity for nitrate in respect to other anions. |
Subject(s):
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-Àrees temàtiques de la UPC::Enginyeria química -Àrees temàtiques de la UPC::Enginyeria dels materials -Thermoplastics -Electrodes, Ion selective -Polymers--chemistry -Polysulfone membrane -Ion-selective electrode -Nitrate -Polímers -Termoplàstics |
Rights:
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Document type:
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Article - Published version Article |
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