Determination of the content of azoxystrobin by near-infrared spectroscopy and support vector regression

The method of rapid determination of the content of azoxystrobin in EC was established by near-infrared spectroscopy (NIR),combined with support vector regression (SVR).The calibration set was composed of samples with different content of azoxystrobin by adding azoxystrobin TC and ethyl acetate to difenoconazole 250 EC.The determination coefficient (R2), root mean squared error of calibration(RMSEC),root mean squared error of validation(RMSEV),and root mean squared error of prediction(RMSEP) for the model established by SVR for the content of active ingredient azoxystrobin were 0.999 7,0.000 9,0.000 9 and 0.001 7 respectively.The results showed that the method of NIR combined with SVR is convenient and quickly and can be used to accurately quantitative analysis of the content of azoxystrobin in EC.