Please use this identifier to cite or link to this item:
https://hdl.handle.net/10216/92107
Author(s): | Correia-Sá, Luísa Fernandes, V. Carvalho, M. Calhau, Conceição Domingues, V.F. Delerue-Matos, C. |
Title: | Optimization of QuEChERS method for the analysis of organochlorine pesticides in soils with diverse organic matter |
Issue Date: | 2012 |
Abstract: | A QuEChERS method has been developed for the determination of 14 organochlorine pesticides in 14 soils from different Portuguese regions with wide range composition. The extracts were analysed by GC-ECD (where GC-ECD is gas chromatography-electron-capture detector) and confirmed by GC-MS/MS (where MS/MS is tandem mass spectrometry). The organic matter content is a key factor in the process efficiency. An optimization was carried out according to soils organic carbon level, divided in two groups: HS (organic carbon > 2.3%) and LS (organic carbon < 2.3%). The method was validated through linearity, recovery, precision and accuracy studies. The quantification was carried out using a matrix-matched calibration to minimize the existence of the matrix effect. Acceptable recoveries were obtained (70-120%) with a relative standard deviation of <= 16% for the three levels of contamination. The ranges of the limits of detection and of the limits of quantification in soils HS were from 3.42 to 23.77 mu g kg(-1) and from 11.41 to 79.23 mu g kg(-1), respectively. For LS soils, the limits of detection ranged from 6.11 to 14.78 mu g kg(-1) and the limits of quantification from 20.37 to 49.27 mu g kg(-1). In the 14 collected soil samples only one showed a residue of dieldrin (45.36 mu g kg(-1)) above the limit of quantification. This methodology combines the advantages of QuEChERS, GC-ECD detection and GC-MS/MS confirmation producing a very rapid, sensitive and reliable procedure which can be applied in routine analytical laboratories. |
Subject: | Ciências da Saúde, Ciências médicas e da saúde Health sciences, Medical and Health sciences |
Scientific areas: | Ciências médicas e da saúde Medical and Health sciences |
URI: | https://hdl.handle.net/10216/92107 |
Document Type: | Artigo em Revista Científica Internacional |
Rights: | restrictedAccess |
Appears in Collections: | FCNAUP - Artigo em Revista Científica Internacional |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
48078.pdf Restricted Access | 696.45 kB | Adobe PDF | Request a copy from the Author(s) |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.