Applicability of the New 60 mu m Polyethylene Glycol Solid-Phase Microextraction Fiber Assembly for the Simultaneous Analysis of Six Pesticides in Water

作者：Pereira Ana^*; Silva Emilia; Cerejeira Maria J

来源：Journal of Chromatographic Science, 2014, 52(5): 423-428.

DOI：10.1093/chromsci/bmt053

A solid-phase microextraction (SPME) method has been applied for the simultaneous analysis of six pesticides in water, with polar to moderately polar range, by gas chromatography-mass spectrometry (GC-MS). Two types of fiber coatings [60 mu m polyethylene glycol (PEG) and 65 mm polydimethylsiloxane/divinylbenzene (PDMS/DVB)] and the effect of salt (addition of 10 and 25% of NaCl) were compared. The extraction efficiency was higher with PEG than with the PDMS/DVB fiber for all pesticides, with the exception of terbuthylazine and phosmet, and with addition of 25% NaCl. The optimized SPME-GC-MS method, adopting the PEG fiber and the addition of 25% NaCl, in addition to other conditions [60 min of direct dipping of the fiber into the water sample (10 mL) under agitation (250 rpm) at ambient temperature; desorption period of 5 min at 240 degrees C] allowed the determination of all studied pesticides and showed good linearity for concentrations ranging from 0.05 to 5 mu g/L. Limits of detection varied between 0.003 and 0.145 mu g/L, with values below 0.025 mu g/L for most of the analytes. Precision ranged from 4.2 to 12%. The proposed method is fast and simple, and was proven to be reliable for the routine analysis of pesticides in water, primarily for environmental monitoring.

• 出版日期2014-6