Fig. 6From: Potentiometric sensor for iron (III) quantitative determination: experimental and computational approachesScanning electron microphotographs (SEM) of iron (III) selective PVC membrane at 10 µm magnifications: a membrane without ionophore that conditioned for 1 day, b membrane with ionophore that conditioned for 1 day, c membrane that conditioned for 10 weeks, and d membrane that conditioned for 20 weeks and used daily over the mentioned periodBack to article page