Research Article Application of a Developed Method for the Extraction of Triazines in Surface Waters and Storage Prior to Analysis to Seawaters of Galicia (Northwest Spain)

Copyright © 2013 Noelia Rodŕıguez-González et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. A simple method based on solid-phase extraction combined with liquid chromatography for simultaneous determination of nine triazine herbicides (ametryn, atrazine, cyanazine, prometryn, propazine, simazine, simetryn, terbuthylazine, and terbutryn) in surface water samples was developed and validated. Under optimized conditions, 50mL of water sample was pumped through the Oasis HLB cartridge, and triazines were eluted with 3mL acetone. Finally the extract was concentrated to dryness, reconstituted with 1mLmethanol: water (1: 1) and injected into theHPLC-DAD system.The stability of the herbicides on the cartridges at−18 and 4∘C was also evaluated, and the recoveries obtained after three weeks of storage were satisfactory for all compounds.The analytical features of the proposed method were satisfactory: repeatability and intermediate precision were <10 % and recoveries in spiked river water and seawater samples were higher than 93 % for all compounds studied. Limits of quantification (varied from 0.46 to 0.9