Enhancement of periodate-hydrogen peroxide chemiluminescence by nitrogen doped carbon dots and its application for the determination of pyrogallol and gallic acid

A new sensitized chemiluminescence (CL) was developed to broaden the analytical application of KIO₄-H₂O₂ system. The nitrogen doped carbon dots (N-CDs) dramatically boosted the CL intensity of KIO₄-H₂O₂ system which was further enriched by basic medium. In light of EPR analysis, free radical scavenging studies and CL spectra the detail mechanism for the enhancement was conferred in the presence of N-CDs and NaOH. The results suggested that CL of KIO₄-H₂O₂ system in the presence and absence of N-CDs and NaOH proceeds via radical pathway. The enhanced CL was used for the determination of pyrogallol and gallic acid in range of 1.0×10^-4-1.0×10^-7 M with 4.6×10^-8 and 6.1×10^-8 M limit of detection respectively. The relative standard deviation (RSD) at a concentration of 10^-5 for gallic acid and pyrogallol was 1.4% and 2.3% respectively (n=11). The attained results unveil that the present method is sensitive, faster, simpler and less costly compared to other methods and could be applied to determine polyphenols in real samples.