10.6084/m9.figshare.5666842.v1
Gustavo G. Pimenta
Gustavo G.
Pimenta
Maria E. L. R. de Queiroz
Maria E. L. R. de
Queiroz
Raquel P. D. Victor
Raquel P. D.
Victor
Luiz M. Noronha
Luiz M.
Noronha
Antônio A. Neves
Antônio A.
Neves
André F. de Oliveira
André F. de
Oliveira
Fernanda F. Heleno
Fernanda F.
Heleno
DLLME-GC/ECD Method for the Residual Analysis of Parathion-Methyl and its Application in the Study of the UV-Photodegradation Process
SciELO journals
2017
pesticide
dispersive liquid-liquid microextraction
gas chromatography
UV radiation
degradation
2017-12-05 08:52:17
Dataset
https://scielo.figshare.com/articles/dataset/DLLME-GC_ECD_Method_for_the_Residual_Analysis_of_Parathion-Methyl_and_its_Application_in_the_Study_of_the_UV-Photodegradation_Process/5666842
<div><p>A new method has been developed to determine trace levels of organophosphorus pesticide parathion-methyl in water samples by using dispersive liquid-liquid microextraction (DLLME), followed by gas chromatograph coupled with electron capture detector (GC/ECD) analysis. The optimized and validated method showed high extraction recovery (101.1%), high enrichment factor (57.3), low limits of detection and quantification, 0.083 and 0.250 µg L-1, respectively. The established DLLME-GC/ECD method has been successfully applied for the evaluation of the photodegradation of the parathion-methyl by UV254nm radiation in different conditions of pH and temperature. The parathion-methyl photodegradation at pH 3 and 35 °C achieved > 99.5% after 120 min of exposition. For this condition, it was observed the kinetic rate of 0.0515 min-1, the quantum yield of 1.22 × 10-5 mol Einstein-1 and a half-life time of 13.46 min. All experimental conditions tested proved to be strongly influenced by pH and temperature. The application of the optimized process in distilled and drinking water spiked with parathion-methyl provided residues of this pesticide at levels below the maximum permitted by Brazilian legislation, which is 9.0 µg L-1.</p></div>