Article ID Journal Published Year Pages File Type
1247375 Talanta 2006 7 Pages PDF
Abstract

The characteristics, performance, and application of an electrode, namely Pt|Hg|Hg2(DCF)2|graphite, where DCF stands for diclofenac ion, are described. This electrode responds to diclofenac with sensitivity of (58.1 ± 0.8) mV/decade over the range 5.0 × 10−5 to 1.0 × 10−2 mol l−1 at pH 6.5–9.0 and a detection limit of 3.2 × 10−5 mol l−1. The electrode is easily constructed at a relatively low cost with fast response time (within 10–30 s) and can be used for a period of 5 months without any considerable divergence in potentials. The proposed sensor displayed good selectivity for diclofenac in the presence of several substances, especially concerning carboxylate and inorganic anions. It was used to determine diclofenac in pharmaceutical preparations by means of the standard additions method. The analytical results obtained by using this electrode are in good agreement with those given by the United States Pharmacopeia procedures.

Related Topics
Physical Sciences and Engineering Chemistry Analytical Chemistry
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