Determination of priority pesticides in water samples combining SPE and SPME coupled to GC-MS. A case study: Suquía River basin (Argentina)

► SPE + SPME - GC-MS is proposed for quantification of pesticides in water samples. ► Quantification of OCPs, OPPs, triazines, pyretroids and chloroacetamides. ► Application of the method in Suquía river water samples. ► Chlorpyrifos and cypermethrine levels surpassed water quality guidelines.