Potentiometric sensors with membranes based on ionic liquid tetradecylammonium triethylammonio-closo-dodecaborate

Polymer compositions based on the ionic liquid tetradecylammonium triethylammonium- closo dodecaborate ( TTCD ) are proposed as the main components of membranes of potentiometric sensors (ion-selective electrodes) for determining ions [B 12 H 11 N(C 2 H 5 ) 3 ] − . Two types of polymer compositions are considered: conventional, polyvinyl chloride ( PVC )-liquid ion-exchanger (solution of TTCD in o -nitrophenyl octyl ether) and another, PVC-TTCD (ionophore-plasticizer). The optimal composition of membranes for both types of electrodes are proposed, and their main electroanalytical parameters, such as selectivity, effect of pH, range of linear response, reproducibility, and stability of potential, were measured. A comparative analysis of the electroanalytical parameters of potentiometric sensors with membranes of two types is given. The detection limits for the electrodes of types I and II are 9 × 10 −7 and 4 × 10 −7 M. It is shown that [B 12 H 11 N(C 2 H 5 ) 3 ] − anions can be determined by potentiometric titration with indicator electrodes of different types.