Abstract

A diclofenac-selective electrode with a plasticized polyvinylchloride membrane was developed. The electrode contained an ionic associate of diclofenac with neutral red and its response was linear over the diclofenac concentration range 5 × 10–5 to 5 × 10–2 M with an electrode function slope of (30.0 ± 1.1) - (44.0 ± 1.2) mV/pC. This membrane electrode was used as a sensor for assaying diclofenac in pharmaceutical formulations.

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