Hot　electron　induced　cathodic　electrochemiluminescence　(ECL)　was　found　at　a　disposable　CdS　modified　screen　printed　carbon　electrodes　(CdS-SPCEs)　during　cathodic　pulse　polarization.　The　ECL　behavior　of　the　modified　electrode　was　investigated　with　two　emissions　located　at　520　nm　and　580　nm.　The　CdS-SPCEs　show　very　stable　and　reproducible　ECL　signal.　The　ECL　intensity　was　linear　with　the　dissolved　oxygen　concentration　in　the　range　of　1.7-33　mg/L　with　a　detection　limit　of　0.02　mg/L　(S/N　=　3).　In　addition,　a　possible　mechanism　for　ECL　behavior　of　the　modified　electrode　was　proposed.　The　developed　method　can　be　applied　to　detect　the　dissolved　oxygen　concentration　or　biochemical　oxygen　demand　(ROD).　(C)　2011　Elsevier　B.V.　All　rights　reserved.