“…In the last years, tandem mass spectrometry (MS/MS) has emerged as a very interesting approach since it allows minimizing matrix interferences and chemical noise in the chromatograms, improving selectivity and sensitivity. Numerous applications based on GC-MS/MS have been reported for the determination of multiclass pesticides using triple quadrupole (Cervera et al 2010;Frenich et al 2005;Medina et al 2009) or ion trap detector analyzers (González-Rodríguez et al 2008;Zhang et al 2008), some of them including around or more than 100 target analytes. In parallel to the interest of increasing the number of compounds in a single chromatographic run, there is a trend to decrease chromatographic run times in multiresidue analysis.…”