N-phenylaza-15-crown-5 as Ionophore in PVC-Matrix for Fe2+ - Selective Sensor

The preparation of polymer membrane selective to Iron(II) ion and its application to ion-selectiveelectrode is reported here. PVC membrane contains Iron–selective N-phenylaza-15-crown-5 asionophore. The membrane electrode is highly selective to Iron(II) ion and exhibit good linearresponse over a wide concentration range of 1.0 × 10-2 to 1.0 × 10-6 M with Nernstian slope of29.2 ± 0.6 mV per decade. The detection limit of electrode is 2.5×10-6 M. It has a response time of<15 s and can be used for more than 2 months without any measurable divergence in potential.The proposed sensor shows fairly a good discriminating ability towards Fe2+ ion in comparison tosome hard and soft metals. The electrode was applied to the determination of Fe2+ ions in theferrous sulfate syrup.