Captan and fenitrothion dissipation in field-treated cauliflowers and effect of household processing.
Field trial studies have been performed with captan and fenitrothion on cauliflower to propose maximum residue limits and to study the dissipation of the pesticides. Residue levels have been determined at different times following good laboratory practice using gas chromatography with mass spectrometric detection. The behaviour of residue levels of these compounds after household processing has been analysed using gas chromatography with electron capture detection. Seven days after treatment, residue levels of captan could be detected, but not of fenitrothion. The half-lives of dissipation for captan and fenitrothion were calculated as 0.9 and 1.8 days respectively. Washing did not significantly affect the residual amounts of captan and fenitrothion observed in raw vegetables; however, after cooking, captan had degraded completely, whereas residue levels of fenitrothion were not modified significantly.
Fernández-Cruz
María L
ML
Departamento de Protección Vegetal, Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria, Carretera de la Coruña km 7.5, E-28040 Madrid, Spain.
Barreda
Mercedes
M
Villarroya
Mercedes
M
Peruga
Arantzazu
A
Llanos
Susana
S
García-Baudín
José M
JM
D001937:Brassica; D002215:Captan / Q000032:analysis* / Q000737:chemistry; D002849:Chromatography, Gas / Q000379:methods; D004781:Environmental Exposure; D005278:Fenitrothion / Q000032:analysis* / Q000737:chemistry; D005506:Food Contamination; D005511:Food Handling; D005659:Fungicides, Industrial / Q000032:analysis* / Q000737:chemistry; D006207:Half-Life; D006358:Hot Temperature; D006863:Hydrogen-Ion Concentration; D007306:Insecticides / Q000032:analysis* / Q000737:chemistry; D013058:Mass Spectrometry / Q000379:methods; D010573:Pesticide Residues / Q000032:analysis* / Q000737:chemistry; D018570:Risk Assessment
D005659:Fungicides, Industrial; D007306:Insecticides; D010573:Pesticide Residues; D002215:Captan; D005278:Fenitrothion