Comprehensive investigation of pesticides in Brazilian surface water by high resolution mass spectrometry screening and gas chromatography–mass spectrometry quantitative analysis
Scholar | Other documents of the author: Della-Flora, Alexandre; Wielens Becker, R.; Frederigi Benassi, S.; Theodoro Toci, A.; Cordeiro, G. A.; Ibáñez Martínez, María; Portolés Nicolau, Tania; Hernández Hernández, Félix; Boroski, Marcela; Sirtori, C.
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TitleComprehensive investigation of pesticides in Brazilian surface water by high resolution mass spectrometry screening and gas chromatography–mass spectrometry quantitative analysis
In this work, a comprehensive investigation on the occurrence of pesticides in the Paraná 3 hydrographic basin of Paraná State, Brazil, was made by application of wide-scope screening based on ultra-high performance ... [+]
In this work, a comprehensive investigation on the occurrence of pesticides in the Paraná 3 hydrographic basin of Paraná State, Brazil, was made by application of wide-scope screening based on ultra-high performance liquid chromatography (LC) and gas chromatography (GC) both coupled to quadrupole time-of-flight mass spectrometry (QTOF MS). The use of two complementary techniques, such as GC-QTOF MS and LC-QTOF MS, allowed screening a large number of compounds with different polarity and volatility. This screening approach was applied to 17 samples, enabling the detection of fifty-two pesticides and six metabolites. In a second step, an specific research was made on the herbicide atrazine, one of the most frequent compounds in samples, and its major transformation products (TPs), which were quantitatively analyzed by dispersive liquid-liquid microextraction (DLLME) followed by GC–MS measurement. Twenty-one agricultural streams from the Paraná 3 hydrographic basin were sampled twice in 2017, each time along six successive weeks. Additional samples were also collected after rain events exceeding 10 mm. In total, 407 samples were quantitatively analyzed by DLLME/GC–MS. Atrazine concentrations did not exceed the maximum permitted concentration of 2 μg L−1 according to Brazilian legislation, and only one surface water sample, collected after precipitation events, was slightly above this value (2.89 μg L−1). The maximum concentrations for the TPs desethylatrazine and deisopropylatrazine were 0.80 and 1.22 μg L−1, respectively. Based on the quantification results, a map was produced showing the occurrence of atrazine and its TPs in the area under study. This is the first time that the presence of agrochemicals is evaluated in the Paraná 3 hydrographic basin. [-]
Investigation projectThe authors thank Divisão de Geoprocessamento from ITAIPU (ODRA.CD) by the maps and soil use study. The authors wish to thank Itaipu Binacional, Fundação Parque Tecnológico Itaipu (FPTI) and UNILA for financial support. Carla Sirtori thanks the CNPq (Processo: 303474/2015-7 and Processo: 403051/2016-9). Alexandre Della Flora thanks the FPTI for his MSc. Research grant. This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil (CAPES) - Finance Code 001. The authors from UJI acknowledge the financial support from Generalitat Valenciana (Research Group of Excellence, PrometeoII/2014/023).
Bibliographic citationDella-Flora, A., et al. "Comprehensive investigation of pesticides in Brazilian surface water by high resolution mass spectrometry screening and gas chromatography–mass spectrometry quantitative analysis." Science of The Total Environment, 2019, vol. 669, p. 248-257
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