مشخصات پژوهش

A simpleandsensitivechemiluminescence(CL)procedurewasdevelopedforthequantification ofnitrite in aqueoussolutions.Themethodisbasedonlight-initiatedgenerationofH2O2 by amagnetic Ag@AgCl@Graphene oxidenanocompositeanditssubsequentredoxreactionwithnitriteioninacidic medium. Duringthecarbonate-catalyzeddecompositionofproducedperoxynitriteandenergytrans- ferring touranine,aCLemissionwasobservedat λ¼534 nm.SeveralfactorsaffectingtheCLintensity wereinvestigatedandoptimized.Underoptimumconditions,theCLintensitywasdirectlyproportional to thenitriteconcentrationintherangeof5‒200ngmL1. Thelimitofdetectionandrelativestandard deviation (for n¼5; atanitriteconcentrationof70ngmL‾1) were1.15ngmL1 and 2.57%,respectively. The methodwassuccessfullyappliedtodeterminenitriteinfoodstuffswithrecoveriesintherangeof 95.0–103.0%forthespikedsamples.Theaccuracyofthemethodwasevaluatedbycomparingtheresults with thoseobtainedbyanalyzingthesamplesusingastandardmethod.