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RESEARCH PRODUCT

Fourier transform infrared determination of Fluometuron in pesticide formulations

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Abstract A single method has been developed for Fourier transform infrared (FTIR) determination of Fluometuron in pesticide formulations. Samples were ultrasonically shaken with CHCl3 for 5 min and the FTIR spectra of sample extracts and standards were obtained at a nominal resolution of 4 cm−1 from 4000 to 900 cm−1 accumulating 25 scans. Fluometuron determination is based on the measure of peak area from 1342 to 1321 cm−1 corrected using a baseline defined from 1352 to 1294 cm−1. This procedure provided a limit of detection of 6.5 μg g−1, a sensitivity of 0.852 a.u. g mg−1 for a pathlength of 0.11 mm, a relative standard deviation of 1.6% for three analysis of a sample containing 50.4% (w/v) and recoveries of 99±2% for spiked samples. It is necessaries only 7 ml of chloroform per sample to do this kind of analysis. When FTIR results in mg g−1 were compared with those found by high performance liquid chromatography (HPLC), a regression line CFTIR=(0.01±0.01)+(0.999±0.005)CHPLC with R2=0.999 was obtained, showing that both methods provide statistically comparable results.