▎ 摘　　要

NOVELTY - Detecting nitrate ion by using solid contact ion selective electrode involves measuring instantaneous current change caused by nitrate concentration change in solution to tested under constant potential by using solid contact ions selective electrode; obtaining electric quantity value by instantaneous Current-time curve integration; using electrical quantity value as quantitative signal to realize detection of nitrate radical. USE - Method for detecting nitrate ion by using solid contact ion selective electrode used in field of electrochemical sensor for determining nitrate radical in environmental water sample. ADVANTAGE - The method enables to provide change of coulomb signal not limited by Nernst equation and slope, realizes accurate measurement of nitrate ion, has wider linear range and lower detection limit.