Measurement of Dissolved Oxygen Based on Enhanced Cerium(IV) Chemiluminescence

Abstract

The reaction of Ce(IV) with pyrogallol caused chemiluminescence, which was enhanced by dissolved oxygen. Dissolved oxygen in water was able to help in the determination by enhancing the chemiluminescence intensity. The limit of detection calculated from 3σ was 43 µmol/dm³, and the relative standard deviation was 1.2% at 613 µmol/dm³ (n = 5). The results obtained for natural and tap water samples were compared with those provided by conventional methods; the agreement between them corroborated the usefulness of the proposed method. The chemiluminescence mechanism was studied by examining the effect of interference with Cl^- and measuring the chemiluminescence spectrum. The chemiluminescence emitter, however, could not be identified.