Dodecyl benzene sulfonate anion-selective electrode based on polyaniline-coated electrode

A new dodecyl benzene sulfonate (DBS−) ion-selective electrode based on polyaniline is reported. The films of polyaniline doped with DBS− were prepared electrochemically on platinum electrodes in the solution containing 1.0×10−3 M aniline and 7.0×10−3 M DBS−. The optimum potentiometric response was obtained for prepared polymeric film by passing electricity of 7.5 C cm−2. The electrode exhibits an excellent Nernstian slope of −59.1±0.3 mV per decade for DBS− ion over a wide concentration range (5.0×10−6 to 4.1×10−3 M) with a low detection limit (1.0×10−6 M). The proposed electrode revealed good sensitivities for DBS− ion over a wide variety of other anions and can be used in the wide pH range of 5–10. It shows good stability, good reproducibility, wide range of pH independency and fast response (<20 s) without using internal solution. This electrode could be used for the determination of DBS− in the real samples.