Fig. 4From: Potentiometric sensor for iron (III) quantitative determination: experimental and computational approachesFT-IR spectra of the fabricated Fe3+ selective membrane (I) and comparison of FT-IR spectra for membrane ingredients under different conditions (II): a newly dry fabricated membrane, b membrane saturated in iron solution for 24 h, c used membrane after 5 weeks and d used membrane after 15 weeksBack to article page