DENG Xiang,HUANG Xiao-mei,DENG Zi-he,et al.Preparation of a Carbon Quantum Dots Fluorescent Probe and Its Application in Detection of Picric Acid[J].Journal of Instrumental Analysis,2023,42(06):736-742.
DENG Xiang,HUANG Xiao-mei,DENG Zi-he,et al.Preparation of a Carbon Quantum Dots Fluorescent Probe and Its Application in Detection of Picric Acid[J].Journal of Instrumental Analysis,2023,42(06):736-742. DOI: 10.19969/j.fxcsxb.23022802.
Preparation of a Carbon Quantum Dots Fluorescent Probe and Its Application in Detection of Picric Acid
Fluorescence carbon quantum dots(CQDs) were fabricated by hydrothermal method with ginkgo leaf as the raw material,which have an average diameter of 5.5 nm,a maximum excitation wavelength of 335 nm and a maximum emission wavelength of 418 nm.A novel method of CQDs for picric acid(PA) detection was established,based on fluorescence resonance energy transfer(FRET) due to the partial overlap between CQDs fluorescence spectrum and PA absorption spectrum.Under the optimal experimental conditions,there existed a good linear relationship between fluorescence intensity ratio before and after adding PA(,I,0,/,I,) and PA concentration(,c,) in the range of 0.2-800 μmol/L,with a correlation coefficient(,r,) of 0.999 5 and a limit of detection(LOD) of 32 nmol/L.The spiked recoveries for PA in real water samples at 5,40 and 80 μmol/L levels ranged from 98.0% to 104%,with relative standard deviations(RSDs) of 1.0%-3.2%.This method could be used for the sensitive,rapid and efficient detection of PA in real samples.
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