1. Automated solid-phase extraction coupled to gad chromatography with electron-capture detection: a combinatiton of extraction and clean-up of pyrethroids in the analysis of surface water
- Author
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G. R. Van Der Hoff, R. A. Baumann, P. van Zoonen, Udo A. Th. Brinkman, F. Pelusio, and BioAnalytical Chemistry
- Subjects
Detection limit ,Insecticides ,Chromatography ,Autoanalysis ,Chromatography, Gas ,Elution ,Organic Chemistry ,Extraction (chemistry) ,Analytical chemistry ,Water ,General Medicine ,Biochemistry ,Toluene ,Analytical Chemistry ,Electron capture detector ,Cartridge ,chemistry.chemical_compound ,chemistry ,Pyrethrins ,Water Pollutants ,Gas chromatography ,Solid phase extraction ,SDG 6 - Clean Water and Sanitation - Abstract
The combination of automated solid-phase extraction (SPE) and large-volume introduction gas chromatography electron-capture detection (GC-ECD) is used for the determination of synthetic pyrethroids in surface and drinking water. The selectivity that is needed for the use of GC-ECD of environmental samples is achieved by addition of a polarity modifier to the sample. In this study, sufficient methanol was added to 19 ml of sample to obtain a level of 30% of modifier prior to SPE. The cartridge is washed with one additional ml of 30% methanol in water. After drying, the cartridge is eluted with toluene. GC-ECD analysis is performed by on-column introduction of 100 μl of the toluene extract. The whole procedure was automated by using an automated solid-phase extraction apparatus. Limits of detection (LODs) for the pyrethroids in surface water are in the range of 1 to 8 ng/l (signal-to-noise ratio=3); even lower limits of detection are possible for drinking water.
- Published
- 1996
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