Determination of Pesticides in Soil Using a Hyphenated Extraction Technique
AUTOR(ES)
Soares, Carlos E. S., Neves, Antônio A., Queiroz, Maria E. L. R., Oliveira, André F., Costa, Anna I. G., Assis, Roberta C., Andrade, Carlos Eduardo O.
FONTE
J. Braz. Chem. Soc.
DATA DE PUBLICAÇÃO
2015-09
RESUMO
A new method for the extraction of pesticide residues from soil was developed, optimized, validated and applied to real samples. The technique consisted of combining single-drop microextraction and solid-liquid extraction with low temperature partitioning (SLE/LTP-SDME) followed by analysis using gas chromatography with electron capture detection (GC/ECD). This method was used to determine the presence of alachlor, methyl parathion, trifluralin, endrin, lindane, dieldrin and dichloro-diphenyl-trichloroethane (4,4’-DDT) in soil samples. Recoveries ranging from 67.2 to 122.5% were achieved, coefficients of variation (repeatability) were lower than 22.4% and limits of detection ranged from 0.18 to 0.59 µg kg-1. Recovery from soils fortified with different concentrations of the pesticides ranged from 61.5 to 123.5%. The new method combines the primary advantages of the two techniques: purification of the sample using SLE/LTP and preconcentration using SDME. The new method also enables the determination of low volatility compounds without requiring the sample to be heated.
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