1. Use and Reuse of SPE Disks for the Determination of Pyrethroids in Water by GC-ECD.
- Author
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Domingues, Valentina, Cabral, Miguel, Alves, Arminda, and Delerue-Matos, Cristina
- Subjects
PYRETHROIDS & the environment ,GAS chromatography ,GAS chromatography/Mass spectrometry (GC-MS) ,CHROMATOGRAPHIC analysis ,ANALYTICAL chemistry ,PARTICLES (Nuclear physics) - Abstract
Seven pyrethroids (bifenthrin, fenpropathrin, λ-cyhalothrin, permethrin, α-cypermethrin, fenvalerate, and deltamethrin) were extracted from water using C18 solid-phase extraction disks, followed by gas chromatography with an electron capture detector (GC-ECD) analysis. The limits of detection in water samples ranged from 0.5 ng L-1 (fenpropathrin) to 110 ng L-1 (permethrin), applying the calibration graph. The effects of different numbers of (re)utilizations of the same disks (up to four times with several concentrations) on the recoveries of the pyrethroids were considered. The recoveries were all between 70 and 120% after four utilizations of the same disk. There was no difference between these recoveries at a confidence level of 95%. [ABSTRACT FROM AUTHOR]
- Published
- 2009
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