Ultrasensitive determination of Cu2+ by synchronous fluorescence spectroscopy with functional nanoparticles
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A new synchronous fluorescence method was developed for the rapid determination of Cu2+ with functional CdS nanoparticles as a probe, based on the fluorescence quenching of functional CdS. The synchronous fluorescence peak is located at 304 nm, scanning with excitation and emission wavelengths of 255 and 460 nm (Δλ = λ em ‑ λ ex = 205 nm), respectively. Under optimum conditions, a linear relationship was found between the relative synchronous fluorescence intensity and the concentration of Cu2+ in the range 0.09 to 27.0 μg L−1. The limit of detection was 3.2 ng L−1. Compared with other general fluorescent methods for the determination of Cu2+, the proposed method had a wider linear range and improved sensitivity. The quenching mechanism has also been discussed. Moreover, analytical application of the method was successfully demonstrated by analysis water samples.
KeywordsSynchronous fluorescence Trace Cu2+ determination Nanoparticles
This work was supported by the Natural Science Foundation of China (20575001) and the Education Commission Natural Science Foundation of Anhui Province (KJ2007B166).
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