Towards minimization of chlorinated solvents consume in Fourier transform infrared spectroscopy determination of Propamocarb in pesticide formulations.
A method has been developed for Fourier transform infrared (FTIR) spectroscopy determination of Propamocarb in emulsifiable pesticide concentrate formulations. Five microliter sample was directly injected without any pretreatment in a CHCl3 stream at 2 mL min(-1) into a closed system and the FTIR spectra of sample and standard solutions were obtained using a nominal resolution of 4 cm(-1) from 4000 to 900 cm(-1) spectral region and accumulating 2 scans per spectrum. Propamocarb determination was based on the measurement of flow injection analysis (FIA) recording height established from FTIR peak area measurements from 1713 to 1703 cm(-1) corrected using a baseline defined at 2000 cm(-1). The concentration of Propamocarb in samples was calculated by interpolation in an external calibration line obtained from several injections of 2 microL of a 47% (w/v) standard solution into the CHCl3 closed system. This procedure provided a limit of detection of 0.8% (w/v) in the original sample, a sensitivity of 0.3190 absorbance units mL mg(-1) for a path length of 0.11 mm and a relative standard deviation of 0.2% for five independent measurements at 0.74 mg mL(-1) concentration level. The maximum sampling frequency of the whole procedure was 34 h(-1) and the waste generation was reduced to only 2 mL of CHCl3 solution per sample and additional 2 mL for the whole calibration line.
Quintás
Guillermo
G
Department of Analytical Chemistry, University of Valencia, Edifici Jeroni Muñoz, 50th Dr. Moliner, 46100 Burjassot, Valencia, Spain.
Armenta
Sergio
S
Garrigues
Salvador
S
de la Guardia
Miguel
M