Determination of carbamate and urea pesticide residues in fresh vegetables using microwave-assisted extraction and liquid chromatography

• Tipo: Artigo em Revista Científica Internacional
• Data: 2009

Autores

Paula Paiga (Autor) Outra; Simone Morais (Autor) Outra; Manuela Correia (Autor) Outra; Cristina Delerue Matos (Autor) Outra; Arminda Alves (Autor) FEUP

Revista

Título: International Journal of Environmental Analytical Chemistry

Vol. 89

Páginas: 199-210

ISSN: 0306-7319

Editora: Taylor & Francis

Indexação

ISI Web of Knowledge - 18 Citações

ISI Web of Science

Scopus - 20 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Química

Outras Informações

ID Authenticus: P-003-QN4

DOI: 10.1080/03067310802526993

Abstract (EN): 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 mu g kg(-1) in each pesticide. The pesticide residues were extracted using 20 mL acetonitrile at 60 degrees C, 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 mu g kg(-1) for carbaryl to 12.3 mu g kg(-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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 12