All-Solid-State PVC Membrane Fe (III) Selective Electrode based on 2-Hydroxymethyl-15-crown-5

Omer Isildak, Omer Durgun

A novel potentiometric sensor based on ionophore (2-Hydroxymethyl-15-crown-5) for the determination of Fe3+ ions is developed. The Fe3+-selective membrane sensor demonstrates high sensitivity and short response time. The detection limit of the Fe3+-selective membrane sensor was about 1.2 ×10−6 mol L-1 and the response time was shorter than 8 s. The linear dynamic range of the Fe3+-selective membrane sensor was between 1.0 × 10−1 and 8.0 × 10−6 mol L-1 Fe3+ concentration. The Fe3+-selective membrane sensor exhibited good operational stability for at least two month keeping in dry conditions at 4–6 ◦C. It had a reproducible and stable response during continuous standard deviation of 0.34% (n = 30).