Sensitized determination of sulfite using flow injection with chemiluminescent detection

Abstract

The acidic oxidation of sulfite by Ce^IV is weakly chemiluminescent. A comparative study of the chemiluminescent determination of sulfite with the use of 3-cyclohexylaminopropanesulfonic acid (CAPS) and of cyclooctylamine as sensitizers of the reaction was made using a flow injection procedure. Despite a slight decrease in sensitivity, it was found that cyclooctylamine was superior to CAPS as a sensitizer and a detection limit of 5.4 × 10^–7 mol l^–1 sulfite was achieved compared with 1 × 10^–5 mol l^–1 using CAPS.