Fourier transform infrared spectrometric determination of Malathion in pesticide formulations |
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Authors: | Guillermo Quintá s,Miguel de la Guardia |
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Affiliation: | Department of Analytical Chemistry, Faculty of Chemistry, University of Valencia, Edifici Jeroni Muñoz, 50 Doctor Moliner St., 46100 Burjassot, Valencia, Spain |
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Abstract: | An environmentally friendly methodology has been developed for quality control analysis of emulsifiable concentrate pesticide formulations containing Malathion as active ingredient, using flow injection analysis (FIA)-Fourier transform infrared (FTIR) spectrometry. Five microlitres samples were directly injected into a 3 ml closed FIA manifold, in which 2 ml of CHCl3 was re-circulated at 1.96 ml min−1. After homogenisation and sample measurement, 2 μl volumes of a Malathion standard were injected, taking absorbance measurements after each injection. Peak height of the chemigrams, established from peak area values between 1027 and 1017 cm−1, corrected with a baseline fixed from 1087 to 993 cm−1 were employed for Malathion quantification using the standard addition approach, after reaching the steady state for every injection. A limit of detection of 12 μg ml−1 was achieved. Results found by standard addition-FTIR in commercially available samples showed a good correlation with those obtained by the reference gas chromatography-flame ionisation detection procedure. |
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Keywords: | Malathion Fourier transform infrared Pesticide formulations |
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