1,1'-(1,4-butanediyl)bis(imidazole) as a Sensing Material for Fabrication of Tm3+-PVC Membrane Sensor

A novel thulium(III) membrane sensor showing a Nernstian response of 20.4±0.3 mV per decade of thulium concentration in the concentration and pH ranges of 1.0 × 10-6 to 1.0×10-2 mol L-1 and 3.4-8.6 respectively is prepared based on the incorporation of 1,1'-(1,4-butanediyl)bis(imidazole) (BYI) into a polymeric membrane sensor. The sensor had a satisfactory selectivity behavior with respect to alkaline, alkaline earth, transition and heavy metal ions and was successfully used in the determination of the fluoride ion in two mouth wash preparations.