Quantitative Analysis of Content of Fenvalerate and Malathion in Agrochemicals by Near-infrared,Attenuated Total Reflectance Infrared and Raman Spectroscopy
The active ingredients such as fenvalerate and malathion in pesticides were determined by the methods of near-infrared,attenuated total reflectance infrared and Raman spectroscopy.The quantitative models were established by partial least squares method and optimized.The independent validation sets were used to evaluate the accuracy of models.The coefficients R2 of determination and SEP of the near-infrared spectroscopy model for fenvalerate and malathion were 0.9981 and 0.9994,0.082 and 0.081,respectively.The R2 and SEP of mid-infrared spectroscopy were 0.9946 and 0.9998,0.082 and 0.081,respectively.Both accuracies of near-infrared spectroscopy and mid-infrared spectroscopy were similar.The coefficients R2 of determination and SEP of Raman were 0.9872 and 0.9993,0.254 and 0.317,respectively,which shows a lower accuracy compared to the other two methods.The result indicated that near-infrared,mid-Infrared and Raman spectroscopy can be applied to the rapid determination of the content of the active ingredients precisely.It is of great significance in the area of on-line determination in the enterprise and the rapid analysis of agrichemicals in the quality monitoring department.