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Determination of carbamate and urea pesticide residues in fresh vegetables using microwave-assisted extraction and liquid chromatography
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Orientador(es)
Resumo(s)
An analytical multiresidue method for the simultaneous determination of seven pesticides in fresh vegetable samples, namely, courgette (Cucurbita pepo),
cucumber (Cucumis sativus), lettuce (Lactuca sativa, Romaine and Iceberg
varieties) and peppers (Capsicum sp.) is described. The procedure, based on
microwave-assisted extraction (MAE) and analysis by liquid chromatography–
photodiode array (LC–PDA) detection was applied to four carbamates
(carbofuran, carbaryl, chlorpropham and EPTC) and three urea pesticides
(monolinuron, metobromuron and linuron). Extraction solvent and the addition
of anhydrous sodium sulphate to fresh vegetable homogenate before MAE were
the parameters optimised for each commodity. Recovery studies were performed
using spiked samples in the range 250–403 µgkg- 1 in each pesticide. The pesticide
residues were extracted using 20mL acetonitrile at 60 ºC, for 10 min. Acceptable
recoveries and RSDs were attained (overall average recovery of 77.2% and RSDs
are lower than 11%). Detection limits ranged between 5.8 µgkg- 1 for carbaryl to
12.3 µgkg- 1 for carbofuran. The analytical protocol was applied for quality
control of 41 fresh vegetable samples bought in Oporto Metropolitan Area
(North Portugal). None of the samples contained any detectable amounts of the
studied compounds.
Descrição
Palavras-chave
Pesticides Carbamates Ureas Microwave-assisted extraction Liquid chromatographyliquid chromatography Vegetables
Contexto Educativo
Citação
Editora
Taylor & Francis