Nitrogen-containing carbon quantum dots(N-CQDs)were synthesized with citric acid(CA)as car-bon source and tris(hydroxymethyl)aminomethane(Tris)by a one-step hydrothermal method.Its structure and spec-tral characteristics were analyzed by ultraviolet spectrum,infrared spectrum and fluorescence spectrum.It was found that Fe3+could"turn off"the fluorescence of N-CQDs,and the addition of tert-butylhydroquinone(TBHQ)can make the fluorescence"turn on"again.On this basis,a new method for the determination of TBHQ was established.The results indicated that there was a good linear relationship between fluorescence intensity and TBHQ mass concentra-tion in the range of 1.00～33.24 μg/mL.The regression equation was y=0.283x+72.295.The recoveries of oil sam-ples were 90.51％～105.80％.This method could be used for rapid analysis and detection of TBHQ in edible oil.
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