| Autor: |
Fenoll, Jose, Hellin, Pilar, Flores, Pilar, Sotomayor, José A., Nicolás, María I. |
| Předmět: |
|
| Zdroj: |
International Journal of Environmental Analytical Chemistry; Aug2008, Vol. 88 Issue 9, p663-670, 8p, 4 Charts, 2 Graphs |
| Abstrakt: |
The present paper reports on an analytical method for the routine analysis of oxadiazon (5-tert-butyl-3-(2,4-dichloro-5-isopropoxyphenyl)-1,3,4-oxadiazol-2(3H)-one) and oxyfluorfen (2-chloro-α,α,α-trifluoro-p-tolyl 3-ethoxy-4-nitrophenyl ether) residues in thyme (Thymus vulgaris L. and Thymus zygis subsp. gracilis). Samples were extracted by sonication with a water-acetonitrile mixture and the herbicides were partitioned into dichloromethane. Residue levels in thyme were determined by gas chromatography with electron-capture detection (ECD). Confirmation analysis of herbicides was carried out by GC/MS in the selected ion monitoring (SIM) mode. The identification of compounds was based on retention time and on comparison of the primary and secondary ions. The average recovery by the GC-ECD method obtained for these compounds varied from 89.0 to 108.5% with a relative standard deviation between 1.9 and 6.1%. The detection limit by the GC-ECD for the pesticides studied varied from 4.9 to 13.9 µg kg-1. The proposed method was applied to thyme samples grown in the Region of Murcia (Spain). The results showed that this method provided a simple, rapid and sensitive way to analyse oxadiazon and oxyfluorfen residues in thyme. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
