Abstract：The carbon quantum dots(CDs) were directly prepared in water solution by microwave method, and its fluorescence property of this CDs were investigated. The CDs fluorescence quenching effect of iron was discussed in detail, and it was applied to determination of iron. The determination was conducted with excitation wavelength as 335 nm and emission wavelength as 450 nm when the concentration of CDs was controlled at 6.24×10-5 (in carbon) after reaction for 10 min in disodium hydrogen phosphate-citric acid buffer solution at pH 6.40. The experiments indicated that the concentration of iron had a good linear relationship to the fluorescence quenching degree of this system. The linear regression equation was ΔF=69.816 c+4.813 6 with correlation coefficient of r=0.998 7. The linear range was 0.004-0.15 mmol/L, and the detection limit of proposed method was 2.4×10－4 mmol/L. The proposed method was applied to the determination of iron content in water samples, and the results were consistent with those obtained by atomic absorption spectrometry. The relative standard deviations were in range of 1.5%-2.1%, and the recoveries were between 92% and 104%.
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