Quality control of Metamitron in agrochemicals using Fourier transform infrared spectroscopy in the middle and near range Original Research Article

Two vibrational spectrometry-based methodologies were developed for Metamitron determination in pesticide formulations. Fourier transform-middle infrared (FT-MIR) procedure was based on the extraction of Metamitron by CHCl3 and latter determination by peak area measurement between 1556 and 1533 cm−1, corrected with a two points baseline established from 1572 to 1514 cm−1. Fourier transform-near infrared (FT-NIR) determination was made after the extraction of Metamitron in acetonitrile and measuring the peak area between 6434 and 6394 cm−1 corrected using a two points baseline defined between 6555 and 6228 cm−1. Repeatability, as relative standard deviation, of 5 independent measurements at mg g−1 concentration level, of 0.16% and 0.07% for MIR and NIR and a limit of detection of 0.03 and 0.004 mg g−1 were obtained for MIR and NIR, respectively.