Novel pipette-tip graphene/poly (vinyl alcohol) cryogel composite extractor for the analysis of carbofuran and carbaryl in water
| Autor: | Kanokrat Charoenpornpukdee, Panote Thavarungkul, Proespichaya Kanatharana, Chongdee Thammakhet |
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| Rok vydání: | 2014 |
| Předmět: |
Vinyl alcohol
Sorbent Carbaryl law.invention Carbofuran chemistry.chemical_compound law Flame Ionization Detection limit Chromatography Graphene Extraction (chemistry) Reproducibility of Results General Medicine Pollution Solvent Absorption Physicochemical chemistry Polyvinyl Alcohol Graphite Adsorption Cryogels Water Pollutants Chemical Environmental Monitoring Food Science |
| DOI: | 10.6084/m9.figshare.1119360.v1 |
| Popis: | A novel pipette-tip extractor of a graphene/poly (vinyl alcohol) cryogel (graphene/PVA) composite sorbent was prepared to preconcentrate carbamate pesticides in environmental water samples before analysis with a gas chromatograph-flame ionization detector (GC-FID). This novel pipette-tip extractor with the graphene/PVA sorbent exhibited a high porosity when observed through a scanning electron micrograph (SEM). Under optimal conditions, using only 1.0 mL of sample and 0.75 mL of eluting solvent, the developed method provided a wide linear range of 10–700 ng mL−1 and 10–500 ng mL−1 with limit of detection (LOD) of 6.40 ± 0.18 and 9.17 ± 0.34 ng mL−1 for carbofuran (2,3-dihydro-2,2-dimethylbenzofuran-7-yl methylcarbamate) and carbaryl (1-naphthyl methylcarbamate), respectively. The pipette-tip extractor provided high extraction efficiency with high accuracy indicated, by good recoveries in the range of 74.5 ± 4.8% to 119.7 ± 1.6% and 76 ± 15% to 114 ± 19% for carbofuran and carbaryl, respectively. In addition, the fabrication procedure showed a good pipette-tip extractor-to-pipette-tip extractor reproducibility with a relative standard deviation of 1.3–9.8% (n = 5). When the developed pipette-tip extractor was applied for the extraction of carbofuran and carbaryl in surface water samples near vegetable plantation areas, 25.9 ± 8.2 ng mL−1 of carbofuran was found, and carbaryl was also detected in concentrations that ranged from 45.0 ± 4.0 to 191 ± 13 ng mL−1. |
| Databáze: | OpenAIRE |
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