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A new poly(vinyl chloride) membrane electrode that is highly selective to Fe 3+ ions was prepared by using 4,4’-Dimethoxybenzil bisthiosemicarbazone (DBTS) as a suitable neutral carrier. Membrane incorporating 4,4’-Dimethoxybenzil bisthiosemicarbazone (DBTS), as ionophore with composition DBTS:NaTPB:NB:PVC in the ratio 2:2:64:32 (w/w) exhibits the best result for potentiometric sensing of Fe 3+ ions. The electrode exhibited a near-Nernstian response to Fe in the concentration range of 1 . 0 × 10 −6 to 1 . 0×10 −2 M with a slope of 19 . 4 ± 0 . 5 mV per decade. The proposed sensor can be used over a period of 2 months. The lower limit of detection was 3.6×10 −7 M. This electrode showed high selectivity with respect to alkaline, alkaline earth, and heavy metal ions and could be used over a pH range of 1.8–5.0. It has been successfully used as an indicator electrode in potentiometric titration of Fe 3+ against EDTA as well as for the determination of Fe in water sample solutions (tap and mineral water samples).

MONITORING OF IRON (III) IONS WITH A FE3+-PVC MEMBRANE SENSOR BASED ON 4, 4'-DIMETHOXYBENZIL BISTHIOSEMICARBAZONE