Tesis
Microextração líquido-líquido dispersiva assistida por vortex e ultrassom aplicada à determinação de diferentes classes de pesticidas em água
Fecha
2015-07-28Registro en:
DUARTE, Jaqueline da Silva. Microextração líquido-líquido dispersiva assistida por vortex e ultrassom aplicada à determinação de diferentes classes de pesticidas em água. 2015. 61 f. Dissertação (Mestrado em Química) - Universidade Federal de Mato Grosso, Instituto de Ciências Exatas e da Terra, Cuiabá, 2015.
Autor
Villa, Ricardo Dalla
http://lattes.cnpq.br/3833910870715410
Villa, Ricardo Dalla
826.129.861-20
http://lattes.cnpq.br/3833910870715410
Dores, Eliana Freire Gaspar de Carvalho
010.092.058-62
http://lattes.cnpq.br/4094572237082106
826.129.861-20
Martins, Eucarlos de Lima
.
http://lattes.cnpq.br/6234624099589221
Institución
Resumen
This study comprised the development and validation of a method of liquid-liquid
microextraction dispersive with emulsification assisted by vortex and ultrasound
(USVADLLME) for the simultaneous determination of four triazines (ametrina,
atrazine, prometryne and terbuthylazine), two triazinones (metribuzin and
hexazinone) and one triazole (flutriafol) in water. The analytes quantitation was
performed by gas chromatography with mass detection (GC-MS). The experimental
condition that provided the best results were: 5.00 mL of sample, 100 µL extractor
solvent toluene and 1 minute of sonication at 40º C. At this conditions, the method
detection limit (MDL) ranged from 0.10 to 2.71 μg L-1
for flutriafol to terbuthylazine,
respectively. The linear working range was 1.00 to 150 μg L-1
. The accuracy,
measured in terms of percentage recovery was greater than 77.2% to all evaluated
analytes. The repeatability and intermediate precision ranged from 1.4 to 9.0% and
from 2.9 to 15%, respectively. The USVADLLME method was also applied to river
water and stream water samples, with different physic chemical properties, and no
matrix effects on the accuracy and precision of the method were not observed. These
results suggest that USVADLLME -GC/MS may be used for the determination of
these analytes in water, with the advantage of using small amounts of solvents, easy
operation and low cost.