Development on ion-selective electrodes and their analytical applications for amines and alkali metal ions in steam generator water

Abstract

Primary alkylammonium ion selective polymeric membrane electrodes based on sodium tetraphenylborate and calix(6]arene ionophore have been developed. Sensor, (calix(6]arene/sodium tetraphenylborate) and mediator or plasticizer were incorporated in high molecular poly vinyl chloride (PYC) with the aid of tetrahydrofuran (THF) for the preparation of membrane. The selectivities of the fabricated ion-selective electrodes were calculated by means of three different experimental methods and the electrodes were found to be very suitable for the measurement of alkyl ammonium ions. Over a pH range 2.9-3.9, the electrodes exhibit a Nernstian response with a reasonable slope (50 and 54 in mY per. concentration decade for sodiumtetraphenylborate and cailxarene based electrodes respectively). Alkylamine, one of the important compounds used in the steam generator waterlboiler water to prevent the corrosion, has been successfully tested using 90th the electrodes. Concentrations of Na + and K+ in boiler water have also been determined using purchased electrodes, selective for these ions.