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Title

OPTIMIZATION OF A NEW POLYMERIC COPPER (II) MEMBRANE ELECTRODE BASED ON METHIMAZOLE USING EXPERIMENTAL DESIGN

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Abstract

 ION SELECTIVE SENSORS HAVE BEEN USED FOR ANALYTICAL DETERMINATION OF A WIDE VARIETY OF IONS. ONE OF THE MOST IMPORTANT FIGURES OF MERIT FOR ION SELECTIVE ELECTRODE (ISE) IS THE SELECTIVITY TOWARDS A SPECIFIC ANALYTE, WHICH IS GENERALLY LIMITED BY THE INTERACTION OF IONOPHORE WITHIN THE MEMBRANE WITH OTHER IONS IN SOLUTION. IONOPHORE PLAYS A KEY ROLE IN THE SENSITIVITY OF ION SELECTIVE ELECTRODE [1]. IT IS FAMILIAR THAT THE SENSIVITY OF CATION SELECTIVE ELECTRODE CONFIRMLY DEPEND ON THE MEMBRANE COMPOSITION AND NATURE OF PLASTICIZER [2]. THUS THE INFLUENCE OF PLASTICIZERS WAS STUDIED AND IT WAS FOUND THAT THE BEST PERFORMANCE WAS OBTAINED WITH DIBUTYL PHTHALATE (DBP) AS A SUITABLE SOLVENT MEDIATOR. PLACKETT-BURMAN AND CENTRAL COMPOSITE DESIGNS WERE APPLIED AS EXPERIMENTAL DESIGN STRATEGIES TO SCREEN AND OPTIMIZE THE INFLUENCE OF MEMBRANE INGREDIENTS ON THE ELECTRODE PERFORMANCE. A NEW POLY (VINYL) CHLORIDE (PVC) MEMBRANE SENSOR FOR CU (II) BASED ON METHIMAZOLE AS AN IONOPHORE WAS PLANNED. THE MAJOR VARIABLES TO FIND A MODEL FOR ACHIEVING THE BEST NERNSTIAN SLOPE AS RESPONSE WERE: PVC, PLASTICIZER, METHIMAZOLE, ADDITIVE, PH, STIRRING RATE AND INTERNAL SOLUTION CONCENTRATION. PLACKETT-BURMAN DESIGN WAS USED TO SCREEN THE MAIN FACTORS (FIG. 1) AND CENTRAL COMPOSITE RESPONSE SURFACE WAS LED TO FIND A MODEL FOR OPTIMIZING THE RESPONSE.

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