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

Document Type : Research Paper




The preparation of polymer membrane selective to Iron(II) ion and its application to ion-selective
electrode is reported here. PVC membrane contains Iron–selective N-phenylaza-15-crown-5 as
ionophore. The membrane electrode is highly selective to Iron(II) ion and exhibit good linear
response over a wide concentration range of 1.0 × 10-2 to 1.0 × 10-6 M with Nernstian slope of
29.2 ± 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 to
some hard and soft metals. The electrode was applied to the determination of Fe2+ ions in the
ferrous sulfate syrup.