Dispersive Liquid-Liquid Microextraction with Liquid Chromatography-Tandem Mass Spectrometry for the Determination of Triazine, Neonicotinoid, Triazole and Imidazolinone Pesticides in Mineral Water Samples
| Autor: | Ednei Gilberto Primel, Cátia Marian Bolzan, Bruno de S. Guimarães, Sergiane Souza Caldas |
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| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Chromatography
Chloroform Central composite design sample preparation Chemistry multiclass pesticides Fractional factorial design General Chemistry Pesticide Solvent Mineral water chemistry.chemical_compound Liquid chromatography–mass spectrometry Acetone mineral water samples dispersive liquid-liquid microextraction |
| Zdroj: | Journal of the Brazilian Chemical Society v.26 n.9 2015 Journal of the Brazilian Chemical Society Sociedade Brasileira de Química (SBQ) instacron:SBQ Journal of the Brazilian Chemical Society, Volume: 26, Issue: 9, Pages: 1902-1913, Published: SEP 2015 |
| Popis: | Mineral water is known for its high purity. Because mineral water is produced by the infiltration of water through the soil, there is the possibility of contamination with pesticides. The aim of this study was to develop a simple, rapid and efficient method for the extraction and preconcentration of different classes of pesticides in mineral water samples by dispersive liquid-liquid microextraction (DLLME) coupled with liquid chromatography tandem mass spectrometry. To optimize the DLLME conditions for the different classes of pesticides and access the effect of variables on the extraction, a central composite design (CCD) with a five-level fractional factorial design was used for the construction of a second order response surface model (RSM). The limits of quantification were between 0.005 and 0.5 μg L-1. Correlation coefficients (r) were higher than 0.999. Recoveries ranged from 102 to 120%, with relative standard deviations between 1 and 10%. Low matrix effect for all compounds was observed. The result showed that using a mixture of acetone and acetonitrile as disperser solvent and a mixture of chloroform and monochlorobenzene as extractor solvent, it is possible to employ the traditional DLLME with chlorinated solvents to extract the multiclass pesticides from the water samples. |
| Databáze: | OpenAIRE |
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