Preliminary Studies on the Determination Bb Modern Methods (GS, GS/MS) of Organochlorine Pesticides in Cereals

Abstract

Pesticides reach the grain directly as a result of phytosanitary treatments applied and indirectly through acquisition of water and soil. Time to disappearance of half the quantity of soil is: 1-4 years aldin, 1-7 years dieldrin, 2-10 years DDT. In areas where, the use of organochlorine pesticides was abandoned long ago than in our country, the contamination of these products is steadily decreasing but continuous monitoring. Separation and identification of compounds present in a sample using GC / MS is more powerful than if the same sample would be analyzed only by GC content or by MS. If the sample is analyzed by gas chromatography may arise some confusion, because there is a possibility that two molecules have the same retention time. Similarly, if the MS analysis is performed it is possible that two molecules have similar mass spectra. When, however, combines gas chromatography with mass spectrometry is highly unlikely that two different molecules behave similarly in the gas chromatograph and mass spectrometer. In this way the identification of pesticide residues in various matrices is not only based on retention times but also on mass spectra, thus eliminating the possible confusion that could arise if the identification were done using only one of the methods mentioned (compounds that have the same retention time or molecules with similar mass spectra).