Application of solid-phase disk extraction followed by gas and liquid chromatography for the simultaneous determination of the fungicides: captan, captafol, carbendazim, chlorothalonil, ethirimol, folpet, metalaxyl and vinclozolin in environmental waters
✍ Scribed by Jaume S. Salau; Rosi Alonso; Gloria Batlló; Damià Barceló
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 865 KB
- Volume
- 293
- Category
- Article
- ISSN
- 0003-2670
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✦ Synopsis
Extraction disks CC,, Empore) were used for the isolation and trace enrichment of several fungicides: captan, captafol, carbendazim, chlorothalonil, ethirimol, folpet, metalaxyl and vinclozolin from drinking, river and estuarine water. From most of the pesticides the recoveries (determined by liquid chromatography with diode array detection (LC-DAD) at 210 nm) varied from 68 to 116% with a coefficient of variation (C.V.) of 3-7%. The recoveries observed for carbendazim and ethirimol in natural waters using IX-DAD were 14 and 30%, respectively. These apparent low recoveries were attributed to the measurement (matrix interferences) and values of 40 and 120%, respectively, were achieved when using liquid chromatography thermospray mass spectrometry (LC-TSP-MS) with selected ion monitoring (SIM) and positive ion (PI) mode detection. Analytical determinations were also carried out using gas chromatography with electron capture detection (GC-ECD) for the direct analysis of five fungicides, with the exception of carbendazim, ethirimol and metalaxyl. Confirmation of the identity of the fungicides was carried out by gas chromatography-mass spectrometry (GC-MS) in the electron impact mode and LC-TSP-MS using both positive and negative ion modes and filament-on. The limits of detection at S/N = 3 were 5, 10, 100 and 500-2000 rig/l when GC-ECD, GC-MS, LC-DAD and LC-TSP-MS were used, respectively.