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|Título:||Optimization of QuEChERS method for the analysis of organochlorine pesticides in soils with diverse organic matter|
Fernandes, Virgínia C.
Domingues, Valentina F.
|Relatório da Série N.º:||Journal of Separation Science; Vol. 35, Issue 12|
|Resumo:||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%). Themethod was validated through linearity, recovery, precision and accuracy studies. The quantification was carried out using a matrixmatched 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 μg kg−1 and from 11.41 to 79.23 μg kg−1, respectively. For LS soils, the limits of detection ranged from 6.11 to 14.78 μg kg−1 and the limits of quantification from 20.37 to 49.27 μg kg−1. In the 14 collected soil samples only one showed a residue of dieldrin (45.36 μg 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.|
|Versão do Editor:||http://onlinelibrary.wiley.com/doi/10.1002/jssc.201200087/abstract;jsessionid=21C4324F17E65B814CB061D27FF59A61.f01t04|
|Aparece nas colecções:||ISEP – GRAQ – Artigos|
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|ART_LuisaSa_2012_GRAQ.pdf||96,21 kB||Adobe PDF||Ver/Abrir|
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