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Rapid analytical methodology has been developed for multi-residuedetermination of pesticides in soils using liquid chromatography coupled to tandemmass spectrometry (LC-MS/MS) with triple quadrupole analyzer. Soil samples werecollected from Argentina in 12 representative agricultural areas, and 18 pesticides wereselected on the basis of their use. Special attention was paid to minimize samplepreparation, making easier the method application to routine analysis. Severalextraction procedures were tested, performing a careful study on matrix effects. Themethod finally proposed (extraction with acetonitrile and subsequent 2-fold dilution withwater without any clean-up step) was fully validated at 0.05 and 0.5 mg/kg on the basison European SANCO 12571/2013 and 825/00 guidelines. The method applicability androbustness was demonstrated by analysis of quality control (QC) samples, consistingon eleven soils spiked at 0.5 mg/kg. These soil samples were collected from differentexperimental plots, and were very diverse in their physico-chemical characteristics. Themethodology developed is of easy application, there is low consumption of solventsand reagents, and no clean-up is required despite the complexity of the soil matrix. Inthe near future, the method developed will be used to monitor the presence ofpesticides in large agricultural areas of Argentina.Generalitat Valenciana: 2009/054; 2014/023; ISIC/2012/01

analytical methods

A simple and rapid analytical methodology based on liquid chromatography-tandem mass spectrometry for monitoring pesticide residues in soils from Argentina