Journal
BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
Volume 89, Issue 3, Pages 638-643Publisher
SPRINGER
DOI: 10.1007/s00128-012-0722-8
Keywords
Bifenthrin; lambda-Cyhalothrin; Dissipation; Residues; Green beans; Greenhouses
Categories
Funding
- Spanish Ministry of Science and Innovation (MICINN) [CTQ2010-15027]
- Volubilis [MA/10/226, A/017203/08]
- INCRE-CYT
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Dissipation of bifenthrin and lambda-cyhalothrin pyrethroid insecticides, under environmental conditions, was evaluated on green beans grown in experimental greenhouses (Souss Massa valley, Morocco). Pesticide residues were determined by gas chromatography with micro electron-capture detector (GC-mu ECD) after dichloromethane extraction and cleanup on florisil phase cartridges. In the case of field experiments, a random block scheme was employed. Each block contained 25 plants in a single row and tests were carried out in triplicates applying pesticides at the recommended doses by the manufacturers. Fruit samples were periodically taken until the end of the preharvest interval (p.i.). The results obtained showed that the p.i of bifenthrin in green bean were 4 days in the winter and 3.5 days in the spring, whereas that for lambda-cyhalothrin 8 days was found in the winter and 7.5 days in the spring. Consequently, it is possible to consider the European Union maximum residue limit (EU MRL) values compatible with the proper agricultural practices used for growing green bean in the plastic greenhouse of Souss Massa valley in South Morocco. Bifenthrin had a degradation of first-order kinetics, whereas that of levels for lambda-cyhalothrin residue can not be interpreted by the use of a first order model.
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