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Advisor(s)
Abstract(s)
QuEChERS original method was modified into a new version for pesticides determination
in soils. The QuEChERS method is based on liquid–liquid portioning with ACN and was
followed by cleanup step using dispersive SPE and disposable pipette tips. Gas chromatographic
separation with MS detection was carried out for pesticides quantification. The
method was validated using recovery experiments for 36 multiclass pesticides. Mean recoveries
of pesticides at each of the four spiking levels between 10–300 µg/kg of soil ranged
from 70–120% for 26 pesticides with RSD values less than 15%. The method achieved low
limit of detection less than 7.6 µ g/kg. Matrix effects were observed for 13 pesticides. Matrix
effects were compensated by using matrix-matched calibration. The method was applied
successfully using d-SPE or DPX in the analysis of the pesticides in soils from organic
farming and integrated pest management.
Description
Keywords
Dispersive solid-phase extraction Disposable pipette extraction Gas chromatography tandem mass spectrometry Integrated pest management Organic farming
