Detector for rapid detection of trace Cu2+ in paddy water based on dual-wavelength quantum dot fluorescent probe
A novel device is designed for rapid detection of trace Cu2+ residues in paddy water using dual-wavelength quantum dot fluorescence probe. It includes three operation procedures: synthesis of dual-wavelength quantum dot, fluorescence excitation and acquisition of weak signal and signal conditioning. Based on the quenching principle of Cu2+ on quantum dot fluorescence, dual-wavelength quantum dot fluorescent probe can get lower limitation of detection. In addition, to improve the accuracy of testing results, two-channel detection was developed for avoiding interference. Experiment results demonstrate that the limitation for detection of trace Cu2+ in paddy water is 1.4 nM. The relationship between the Cu2+ concentration (x) and the ratio variation of dual wavelength (y) is y = 2.15 × exp(x/5.862) − 1.154 with the coefficient of determination (R2) of 0.997 and the detection time of 4 min. Meanwhile, compared to other heavy metal ions, nutrient and organic compounds, the presented detector is of good selectivity for Cu2+ in paddy water. The repetitive detection experiments show that the developed device has high repeatability with relative standard deviation of 0.14%. The device can be used for quick and accurate detection of trace Cu2+ residues in paddy water with some specific advantages of high sensitivity, excellent selectivity and high repeatability.
KeywordsDual-wavelength quantum dot fluorescence probe Trace copper ion Paddy water Rapid detection
This work was supported by Anhui Provincial Natural Science Foundation (1708085QF134), Anhui Provincial Science and Technology Project (17030701062), Natural Science Research Project of Anhui Provincial Education Department (KJ2017A006), National Natural Science Foundation of China (61672032), Open Foundation of Science and Technology on Communication Networks Laboratory (XX17641X011-02) and National Key Research and Development Program (2016YFD0800904).
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Conflict of interest
The authors declare that they have no conflict of interest.
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