Fourier transform infrared spectrometric strategies for the determination of Buprofezin in pesticide formulations

Two different strategies for Buprofezin determination, an off-line extraction and stopped-flow determination and an automated procedure, based on the on-line extraction of Buprofezin samples with chloroform and flowing action analysis-fourier transform infrared (FIA-FT-IR) spectrometric measurement of the extracts, have been developed. For the treatment of the off-line extraction mode, data a three-factor partial least squares (PLSs) calibration was developed, using the region from 1465.7 to 1342.3 cm(-1) with a single point baseline defined at 2051.9 cm(-1) and based on the use of chloroform solutions of Buprofezin. The method provides a R.S.D. <0.1%, recoveries of the order of 100% and generates 25 nil of CHCl3 waste for each sample. On the other hand, the recommended FIA method provided a 3 s limit of detection of 20 μg ml(-1), which corresponds to 0.12% (w/w) in the solid sample, a repeatability of 0.8% as R.S.D., and a maximum sampling frequency for the whole procedure of 6 h(-1). The waste generation, being lower than the off-line strategy, is only 3 ml of CHCl3 per sample. © 2002 Elsevier Science B.V. All rights reserved.