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Advisor(s)
Abstract(s)
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.
Description
Keywords
GC-ECD GC-MS/MS Organochlorine pesticides QuEChERS Soils
Citation
Publisher
Wiley-VCH Verlag