Abstract
A simple method based on dichloromethane extraction, gas chromatographic pulse flame photometric detection (GC/PFPD) and GC/MS confirmation has been applied to the analysis of chlorpyrifos and chlorpyrifos oxon residues in both tomatoes and green beans grown in two different types of greenhouses. To establish the influence of environmental conditions on the decrease of chlorpyrifos, several field trials have been carried out in which crops were sprayed at two different doses and in two seasons (spring and winter). Analysis of variance (ANOVA) has been applied to the results obtained, showing that the type of crop and the season are the most relevant factors in the degradation of chlorpyrifos. The oxon was detected the first 5 days after application, but a correlation with the diminution of the parent compound has not been found. The half-life of chlorpyrifos ranged between 4 and 5 days depending on the crop and season. Keywords: Chlorpyrifos; chlorpyrifos oxon; diminution; residues; tomatoes; green beans;...
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