Abstract：The L-lysine modified fluorescent carbon quantum dots (CQDs) were prepared by microwave method using glucose as the raw material. The fluorescence quenching effect between CQDs and cobalt were investigated for the application in determination of cobalt. The structures of L-lysine modified CQDs were characterized and analyzed by high-resolution transmission electron microscopy (TEM) and X-ray diffraction (XRD), Fourier transform infrared spectrometry (FTIR), ultraviolet-visible absorption spectroscopy and photoluminescence spectroscopy. The results showed that the prepared CQDs had strong fluorescence characteristics. The conditional optimization experiments indicated that the maximum fluorescence emission wavelength of CQDs was located at 420nm in B-R buffer system at pH 9.70 under the excitation wavelength of 340nm. The mass concentration of Co2+ in range of 0.03-0.60μg/mL and 0.60-4.0μg/mL had good linear relationship with the fluorescence quenching intensity of system. The correlation coefficient was 0.9964 and 0.9918, respectively. The detection limit of method was 3.84ng/mL. The proposed method was applied for the determination of trace cobalt in water samples. The found results were basically consistent with those obtained by atomic absorption spectrometry (AAS). The relative standard deviations (RSD, n=5) were between 1.7% and 2.0%.
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