Abstract：A quantitative method for determination of nickel was established based on the fluorescence quenching effect of nickel ion on cadmium telluride(CdTe) quantum dots. The experimental results indicated that the fluorescence attenuation degree of CdTe quantum dots was linear to the concentration of nickel ions in range of 2.0×10-7-7.8×10-5 mol/L under the following conditions: 0.5 mL of 1.5×10-4 mol/L CdTe quantum dots solution (in Cd2+) and 50 μL nickel standard solution with different concentrations were added into 5 mL colorimetric tube successively; the mixed solution was diluted to the mark with borax buffer solution at pH 10.0; after reaction at room temperature for 10 min, the relative fluorescence intensity was determined at fluorescence emission wavelength of 608 nm with 400 nm as excitation wavelength. The equation of linear regression was F0/F=1.008 9+0.030 8 ρ (μmol/L) with correlation coefficient of r=0.998 7. The detection limit was 1.5×10-7 mol/L. The proposed method was applied to the determination of nickel ions in water sample. The results were consistent with those obtained by atomic absorption spectrometry (AAS). The relative standard deviation (RSD, n=5) was 5.6%.
