Please use this identifier to cite or link to this item:
https://hdl.handle.net/10216/99062
Full metadata record
DC Field | Value | Language |
---|---|---|
dc.creator | Sá, Maria | |
dc.creator | Fernandes, Virginia | |
dc.creator | Calhau, Conceição | |
dc.creator | Domingues, Valentina | |
dc.creator | Matos, Cristina | |
dc.date.accessioned | 2022-09-06T19:59:54Z | - |
dc.date.available | 2022-09-06T19:59:54Z | - |
dc.date.issued | 2013 | |
dc.identifier.issn | 1936-9751 | |
dc.identifier.other | sigarra:47862 | |
dc.identifier.uri | https://hdl.handle.net/10216/99062 | - |
dc.description.abstract | An optimised version of the Quick, Easy, Cheap, Effective, Rugged and Safe (QuEChERS) method for simultaneous determination of 14 organochlorine pesticides in carrots was developed using gas chromatography coupled with electron-capture detector (GC-ECD) and confirmation by gas chromatography tandem mass spectrometry (GC-MS/MS). A citrate-buffered version of QuEChERS was applied for the extraction of the organochlorine pesticides, and for the extract clean-up, primary secondary amine, octadecyl-bonded silica (C18), magnesium sulphate (MgSO4) and graphitized carbon black were used as sorbents. The GC-ECD determination of the target compounds was achieved in less than 20 min. The limits of detection were below the EU maximum residue limits (MRLs) for carrots, 10-50 mu g kg(-1), while the limit of quantification did exceed 10 mu g kg(-1) for hexachlorobenzene (HCB). The introduction of a sonication step was shown to improve the recoveries. The overall average recoveries in carrots, at the four tested levels (60, 80, 100 and 140 mu g kg(-1)), ranged from 66 to 111 % with relative standard deviations in the range of 2-15 % (n = 3) for all analytes, with the exception of HCB. The method has been applied to the analysis of 21 carrot samples from different Portuguese regions, and beta-HCH was the pesticide most frequently found, with concentrations oscillating between less than the limit of quantification to 14.6 mu g kg(-1). Only one sample had a pesticide residue (beta-HCH) above the MRL, 14.6 mu g kg(-1). This methodology combines the advantages of both QuEChERS and GC-ECD, producing a very rapid, sensitive and reliable procedure which can be applied in routine analytical laboratories. | |
dc.language.iso | eng | |
dc.rights | restrictedAccess | |
dc.subject | Ciências da Saúde, Ciências da saúde | |
dc.subject | Health sciences, Health sciences | |
dc.title | Optimization of QuEChERS Procedure Coupled to GC-ECD for Organochlorine Pesticide Determination in Carrot Samples | |
dc.type | Artigo em Revista Científica Internacional | |
dc.contributor.uporto | Faculdade de Ciências da Nutrição e Alimentação | |
dc.identifier.doi | 10.1007/s12161-012-9463-x | |
dc.subject.fos | Ciências médicas e da saúde::Ciências da saúde | |
dc.subject.fos | Medical and Health sciences::Health sciences | |
Appears in Collections: | FCNAUP - Artigo em Revista Científica Internacional |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
47862.pdf Restricted Access | 351.32 kB | Adobe PDF | Request a copy from the Author(s) |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.