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

• Type: Article in International Scientific Journal
• Date: 2009

Authors

Paula Paiga (Author) Other; Simone Morais (Author) Other; Manuela Correia (Author) Other; Cristina Delerue Matos (Author) Other; Arminda Alves (Author) FEUP

Journal

Title: International Journal of Environmental Analytical Chemistry

Vol. 89

Pages: 199-210

ISSN: 0306-7319

Publisher: Taylor & Francis

Indexing

ISI Web of Knowledge - 18 Citations

ISI Web of Science

Scopus - 20 Citations

Scientific classification

FOS: Natural sciences > Chemical sciences

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 12