MICROEXTRACTION IN PACKED SYRINGE COUPLED WITH GC-MS FOR THE DETERMINATION OF PESTICIDES IN ENVIRONMENTAL WATER SAMPLES

摘要

Fast, efficient and solvent-minimized analytical method based on a microextraction in packed syringe (MEPS) coupled with gas chromatography- mass spectrometry (GC-MS) was developed for the determination of selected pesticides in environmental water samples. Many factors, which affect the performance of MEPS, such as the volume and composition of desorption solvent, the sample volume applied without loss in recoveries and the type of the sorbent were studied. Recoveries were evaluated at five concentration levels (0.05, 0.1, 1, 5 and 10 ^g/L) and ranged between 77 - 119 . Precision was expressed as relative standard deviation (RSD), and it was evaluated as intraday and interday precision, with values always below 20 . Limits of detection (LODs) ranged from 0.4 to 15 ng/L, whereas limits of quantification (LOQs) from 1.3 to 50 ng/L. The applicability of the method was proved by analysis of river water samples.