Title: Detection method of chlorpyrifos pesticide residue on spinach surface based on Raman spectroscopy
Abstract: Objective To explore a rapid and nondestructive method for the determination of pesticide residue on the surface of spinach by Raman spectroscopy. Methods Raman spectral signals from different concentrations of pesticide on spinach were acquired by laboratory-setting-up Raman spectroscopy detection system. Savitzky-Golay five-point filter was used to smooth the original Raman spectra, the 10th order polynomial fitting based on the partial least square was used to remove the fluorescence background from Raman signals, and compared the Raman spectrum of spinach containing different concentration chlorpyrifos pesticide. Results Chlorpyrifos pesticide residue on spinach surface could be detected based on 632 cm-1 Raman signal(chemical bonds vibration of P=S), the minimum value of chlorpyrifos pesticide on spinach surface was 400 mg/kg, and there was a good linear correlation between the concentrations of pesticide residue on spinach's surface and the relative intensity of Raman signals. The correlation coefficient of this study was 0.92. Conclusion The study demonstrated that Raman spectroscopy had a great potential for rapid and non-destructive detection of pesticide residue on spinach's surface.
Publication Year: 2014
Publication Date: 2014-01-01
Language: en
Type: article
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