Validation and application of a QuEChERS based method for estimation of half-life of imidazolinone herbicides in soils by LC-ESI-MS/MS
| Autor: | Antonio Alberto da Silva, Francisco Cláudio Lopes de Freitas, Maria Carolina Gomes Paiva, Maria Inês da Costa Marinho, Nívea Moreira Vieira, Anna I. G. Costa |
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| Rok vydání: | 2018 |
| Předmět: |
Soil test
Health Toxicology and Mutagenesis 0211 other engineering and technologies 02 engineering and technology 010501 environmental sciences Quechers 01 natural sciences Sensitivity and Specificity Matrix (chemical analysis) chemistry.chemical_compound Soil Liquid chromatography–mass spectrometry Tandem Mass Spectrometry Soil Pollutants Leaching (agriculture) Chromatography High Pressure Liquid 0105 earth and related environmental sciences 021110 strategic defence & security studies Chromatography Chemistry Herbicides Public Health Environmental and Occupational Health Imidazoles Nicotinic Acids Half-life General Medicine Imazapic Pollution Soil water Chromatography Liquid Half-Life |
| Zdroj: | Ecotoxicology and environmental safety. 167 |
| ISSN: | 1090-2414 |
| Popis: | A modified QuEChERS (quick, easy, cheap, effective, rugged and safe) method was validated and applied for the estimation of half-lives of two imidazolinone group herbicides, imazethapyr and imazapic, in the Dystric Plinthosol (FX) and Ferralsol (LVA) agricultural soils using liquid chromatography tandem mass spectrometry. The solutions were prepared in a matrix extract to avoid matrix effects. The analytical method showed satisfactory specificity, selectivity, linearity (R2 > 0.99), recoveries (range 85.0–117.0%), with RSD between 6.7% and 16.6%, and precision (range 94.7–108.5%), with RSD between 6.0% and 11.9%. The limit of detections for imazethapyr and imazapic in the soils were 2.2 µg kg−1 and 2.0 µg kg−1, and the limit of quantifications were 6.6 µg kg−1 and 6.1 µg kg−1. The half-lives of imazethapyr (35.7 and 97.9 days) and imazapic (40.4 and 64.4 days), in the FX and LVA soils, respectively, indicate that they are medium-persistence herbicides with possibility of leaching into groundwater. In addition, high concentrations of imazethapyr and imazapic were found in the soil samples after the time of application, meaning that there is a potential for prolonged soil residual activity due to carryover. |
| Databáze: | OpenAIRE |
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