Rapid Detection of Dichlorvos in Chlorpyrifos by Mid-Infrared and Near-Infrared Spectroscopy

In the present study,the content of dichlorvos in chlorpyrifos was rapidly determined by mid-infrared and near-infrared spectroscopy.The quantitative models were established by partial least squares(PLS)method and optimized.The independent validation sets and 7 test samples were used to evaluate the model accuracy.The results showed that mid-infrared and nearinfrared spectroscopy can accurately determine the content of dichlorvos in chlorpyrifos.The RMSEC(the root mean square error of calibration)of the mid-infrared model and near-infrared model was 0.013 and 0.020,respectively.R2(determination coefficient)both were 1.000.For 7 test samples,RMSEP before model recalibration is 0.22(MIRS)and 0.09(NIRS).The adaptability of the near-infrared model was much better and model updating was unnecessary.To sum up,MIR and NIR are both rapid and easy-operation method with simple pretreatment.