Ionic liquids as new lipophilic additives to the membrane of lead ion-selective electrodes with solid contact

Abstract

The potentiometric properties of lead-selective electrodes with solid contact containing in the polymeric membrane addition of ionic liquids (ILs) were investigated. The studies were carried out with plasticised PVC membranes doped with alkylmethyl imidazolium chlorides. The electrode basic analytical parameters, such as detection limit, linear range, slope characteristic, response time and dependence of the electrode potential on pH as well as selectivity coefficients in relation to some inorganic cations were determined. As follows from the studies, the addition of ILs to the membrane phase improved the analytical parameters of the studied electrodes, especially the improvement in selectivity was notable. The best results were obtained for electrode having membrane dopped with 1-butyl-3-methylimidazolium chloride (BMImCl).

Keywords:

• lead ion-selective electrode
• ionic liquids
• solid contact