Quaternary Alkylammonium and Alkylphosphonium Pertechnetates: Application toPertechnetate Ion-Selective Electrodes

Abstract

Pertechnetate ion-selective PVC membrane electrodes based on quaternary alkylammonium and phosphonium salts (bromides and pertechnetates) were examined. The most favorable ionophore was tetradecyltrimethylammo-nium bromide. The response function was linear within the concentration range 10-2-10-6 cool/L and the slope was 52 mV/pTcO4. The detection limit remained at 5.10-7 mol/L. The selectivity and response time of the electrodes was studied and it was found that the electrodes exhibited high selectivity to TcO4-anion against the main inorganic components of radioactive waste solutions and environmental waters (nitrate, sulfate, chloride and others). The electrodes response was stable over a wide pH range.