Flow injection chemiluminescence determination of hydrazine

A sensitive and selective flow injection chemiluminescence method for the determination of hydrazine over the range 1×10−6−5×10−5 M is described. The method is based on the chemiluminescence emitted during the oxidation of hydrazine by N-bromosuccinimide in alkaline medium in the presence of dichlorofluorescein as sensitizer. The presence of citrate prevents the precipitation of some cations in the reaction medium and also causes an enhancement in chemiluminescence intensity. Method development includes optimization of reagent concentrations and flow conditions. The optimized method yielded a 2σ detection limit of 5×10−7 M. The method also has good selectivity. The method is simple, fast, selective and precise.