Caesium PVC–crown (dibenzo-24-crown-8) based membrane sensor

Abstract

A PVC-based membrane of dibenzo-24-crown-8 exhibits good response for Cs⁺ in a wide concentration range (3.5 × 10^–5–1.0 × 10^–1 mol dm^–3) with a near-Nernstian slope of 50.7 mV per decade of concentration of CsCl. The response time of the sensor is <10 s and the membrane can be used for more than 3 months without observing any divergence. In addition, the proposed sensor exhibits very good selectivity for Cs⁺ over other cations. The electrode can be used in a wide pH range (3.0–9.0) and also as the indicator electrode in titrations involving caesium ions.