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 1.0x10(-3)M aniline and 7.0x10(-3)M DBS(-). The optimum potentiometric response was obtained for prepared polymeric film by passing electricity of 7.5Ccm(-2). The electrode exhibits an excellent Nernstian slope of -59.1+/-0.3mV per decade for DBS(-) ion over a wide concentration range (5.0x10(-6) to 4.1x10(-3)M) with a low detection limit (1.0x10(-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 (<20s) without using internal solution. This electrode could be used for the determination of DBS(-) in the real samples.