Rapid determination of the content of deltamethrin in agrochemicals by near-infrared spectroscopy

The method of near-infrared spectroscopy combined with the algorithm of partial least square (PLS) was used for the rapid determination of the content of deltamethrin in agrochemicals.By comparing the near-infrared spectra of the agrochemicals with common solvents,the solvent of the agrochemicals was determined.The calibration set was composed of the samples with different content of deltamethrin made by adding the solvent or the technical product of deltamethrin.Near-infrared spectroscopy combined with algorithm of partial least square (PLS) being employed,the content of deltamethrin in the algrochemicals was analyzed quantitatively.The determination coefficient R2,SEC and RMSECV were 0.999 9,0.013 and 0.022 respectively.The result indicated that the method of near-infrared spectroscopy can be used to analyze the active ingredient in the agrochemicals precisely,which is a convenient and quick method for routine analysis of deltamethrin products.