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Cr(Ⅵ) ion and some metal ions were found to be able to quench the electrochemilunescence (ECL) of GQDs/S2O8 2- coreactant system.Except for Cr(Ⅵ) ion,the quenching effect of other metal ions on the ECL could be nearly eliminated.Therefore,a sensitive and selective ECL sensor for Cr(Ⅵ) ion was finally developed based on the GQDs/S2O8 2-coreactant system after optimizing some important experimental conditions.