Method validation for multiresidue pesticide determination in riverbed sediment using QuEChERS and GC-MS/MS and application in samples from an important watershed in Central Western Brazil
| Autor: | Debora Renata Cassoli de Souza Dutra, Márcia Regina Assalin, Eliana Freire Gaspar de Carvalho Dores, Roberta Scanagatta Dos Santos |
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| Rok vydání: | 2019 |
| Předmět: |
Chromatography
Pesticide residue Health Toxicology and Mutagenesis 010401 analytical chemistry Bifenthrin Public Health Environmental and Occupational Health Soil Science Trifluralin Repeatability 010501 environmental sciences Pesticide Quechers 01 natural sciences Pollution 0104 chemical sciences Analytical Chemistry chemistry.chemical_compound chemistry Environmental Chemistry Environmental science Carbosulfan Gas chromatography–mass spectrometry Waste Management and Disposal 0105 earth and related environmental sciences Water Science and Technology |
| Zdroj: | International Journal of Environmental Analytical Chemistry. 100:1536-1548 |
| ISSN: | 1029-0397 0306-7319 |
| Popis: | This study aims at validating a method used to determine pesticide residues in areas of cotton and soybean crops riverbed sediments in the Sao Lourenco River basin, an important watershed in Central Western Brazil, which has a history of pesticide use during cultivation. The optimised QuEChERS acetate methodology was validated, demonstrating good accuracy (71.7–116.4%), except for carbosulfan (51.0%), and good precision (intra-day repeatability 5.1–20.0% and inter-day reproducibility 6.2–18.5%) except for trifluralin and carbosulfan. The linearity was satisfactory with coefficient determination R² > 0,99. The use of internal standard, triphenyl phosphate (TPP), showed better results during validation than without its use. The limits of detection and quantification range were 1.07 to 10.7 ng g⁻¹ and 5.0 to 15.0 ng g⁻¹ of dry weight sediment, respectively. The matrix effect was evaluated and a strong signal enhancement was observed using gas chromatograph (GC) coupled with spectrometry mass (MS/MS). The use of matrix-matched standards was compensated by better sensibility in the analysis. The use of simple, fast, sensitive methodology combined with the use of two transitions, retention time and ion ratio, makes it suitable for the analysis of complex samples such as sediment. Finally, the method was applied to samples of river sediment collected near cotton and soybean cultivation. Twelve sediment samples from the Sao Lourenco River basin, Mato Grosso, were analysed to test the applicability of the validated method. Among the 22 analysed pesticides, cyhalothrin (ʎ and δ) was detected in two samples (59.8 and 66.9 ng g⁻¹), difenoconazole in five samples ( |
| Databáze: | OpenAIRE |
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