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Multiresidue pesticides analysis in soils using modified Q u EC h ERS with disposable pipette extraction and dispersive solid‐phase extraction
Author(s) -
Fernandes Virgínia C.,
Domingues Valentina F.,
Mateus Nuno,
DelerueMatos Cristina
Publication year - 2013
Publication title -
journal of separation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.72
H-Index - 102
eISSN - 1615-9314
pISSN - 1615-9306
DOI - 10.1002/jssc.201200673
Subject(s) - quechers , pesticide , extraction (chemistry) , chromatography , solid phase extraction , detection limit , matrix (chemical analysis) , chemistry , soil water , gas chromatography , soil test , pipette , pesticide residue , sample preparation , calibration curve , environmental chemistry , environmental science , soil science , agronomy , biology
Q u EC h ERS original method was modified into a new version for pesticides determination in soils. The Q u EC h ERS 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 reco‐veries 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 μg/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.