A novel polyvinyl chloride (PVC) membrane sensor that is highly selective to Fe3+ ions was
prepared by using 5-chloro-3-[4-(trifluoromethoxy)phenylimino]indolin-2-one (CFMEPI) ionophore.
The sensor exhibits a Nernstian response for Fe3+ ions over a wide concentration range (1.0 ×10-2
-1.0×10-6M) with a slope of 46.7±0.5 mV per decade. The sensor has a response time of 20s and can be
used for at least 3 months without any measurable divergence in potential. It was concluded that the sensor response was
pH independent in the range of 4.0-8.61. The sensor has some advantages such as short analysis time, particularly high selectivity
towards iron (III). The sensor was used successfully for direct determination of Fe3+ in several synthetic and real
samples with satisfactory results.
Keywords: Fe3+-selective electrode, PVC membrane, All-solid-state, determination of Fe3+, potentiometer.
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