| Autor: |
Patel, Katan, Fussell, Richard J., Goodall, David M., Keely, Brendan J. |
| Zdroj: |
Journal of Separation Science (JSS) (formerly Journal of High Resolution Chromatography); January 2006, Vol. 29 Issue: 1 p90-95, 6p |
| Abstrakt: |
The combination of a programmable temperature vaporisation (PTV) injector with resistive heating GC (RH‐GC), a form of fast GC, has been applied to the analysis of organophosphorus (OP) pesticides. The PTV injector was optimised in the ‘at‐once’ solvent vent mode for the injection of ethyl acetate (10–40 μL) or ACN (10 μL). The short RH‐GC column (5 m×0.25 mm ID) with fast temperature ramps (up to 153°C/min) allowed the separation of a total of 20 OP pesticides in less than 6 min. Average recoveries between 67 and 119% were obtained for pesticides spiked at 0.01 mg/kg into apple and pear matrix. Extraction of orange juice with ACN provided higher recoveries (92–104%) for methamidophos, acephate and omethoate compared to ethyl acetate (62–73%). Results for analysis of OP pesticides in samples containing incurred residues were in good agreement with those obtained using GC‐MS. The overall method was rapid, allowing 20 samples to be analysed in 4 h. |
| Databáze: |
Supplemental Index |
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