Oliveira, Ana Teresa Lopes Branco deHmida, Raed BenRibeiro, António E.Brito, PauloQueiroz, Ana2020-02-242020-02-242019Oliveira, Ana; Ben Hmida, Raed; Ribeiro, António E.; Brito, Paulo; Queiroz, A.M. (2019). Rapid determination of some of the most used pesticides in Northeast Portugal as emerging contaminants in rivers by SPME/GC-MS. In 11.º Encontro Nacional de Cromatografia. Almadahttp://hdl.handle.net/10198/20661In this communication the development of an analytical methodology is presented for the monitoring of five emerging pollutants, namely, alachlor, metolachlor, heptachlor, dimethoate, and terbuthylazine. These compounds are among the most used pesticides in the northeast region of Portugal and Tunisia. The complete experimental methodology is optimized based on the simultaneous extraction and concentration of all five pesticides from aqueous matrices, by means of solid-phase micro-extraction (SPME) followed by detection and quantification using gas chromatography with mass spectrometry (GC-MS). The optimization of the extraction step is performed using a polydimethylsiloxane-divinylbenzene (PDMS-DVB) coated SPME fiber by direct immersion (DI-SPME) in the aqueous sample.engconference poster