2008
DOI: 10.1016/j.talanta.2008.01.058
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Abstract: This paper describes a new gas-chromatography with electron capture detection (GC-ECD) method for determination of some pyrethroids in milk samples. The extraction of the pyrethroids was carried out by liquid-liquid extraction with clean-up by precipitation at low temperature, without additional stages for removal of fat interferences. The method was efficient with recoveries of 93.0+/-0.1% for cipermethrin and 84.0+/-0.3% for deltamethrin. The quantification limits were 0.75 microg L(-1) for both pyrethroids.… Show more

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Cited by 119 publications
(81 citation statements)
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“…It can be observed in Figures 2a and 3a that the volume increase of acetonitrile from 2 to 4 mL caused an increase of approximately 21% in efficiency of pesticide extraction for the three carbamates in the two beverages studied. In the LLE-LTP technique, it was observed in this study, as well as in similar studies, 64,71,73,74 that a sample to solvent extractor volume of 1:2 (v/v) facilitated the migration of the solutes to the organic phase, independent of the matrix and class of pesticides studied. …”
supporting
confidence: 75%
“…It can be observed in Figures 2a and 3a that the volume increase of acetonitrile from 2 to 4 mL caused an increase of approximately 21% in efficiency of pesticide extraction for the three carbamates in the two beverages studied. In the LLE-LTP technique, it was observed in this study, as well as in similar studies, 64,71,73,74 that a sample to solvent extractor volume of 1:2 (v/v) facilitated the migration of the solutes to the organic phase, independent of the matrix and class of pesticides studied. …”
supporting
confidence: 75%
“…O preparo de amostra pode ser a etapa mais laboriosa de um método multirresíduo, e diferentes estratégias têm sido utilizadas para extrair os resíduos e realizar o clean-up da amostra. 52 As técnicas mais empregadas para matrizes de origem animal são a extração líquido-líquido (ELL), 22 extração em fase sólida (EFS), 53 extração em fase sólida dispersiva (EFSdispersivo), 18 dispersão de matriz em fase sólida (DMFS), 31 extração líquido-líquido com purificação em baixa temperatura (ELL-PBT), 54,55 extração líquido-líquido com rápida partição à baixa temperatura (ELL-RPBT), 56,57 e o método QuEChERS (do inglês Quick, Easy, Cheap, Effective, Rugged and Safe). 58 A Tabela 1 mostra alguns trabalhos publicados nos últimos anos na análise de resíduos de medicamentos veterinários em amostras de leite, ovos e outras matrizes.…”
Section: Métodos Cromatográficos Confirmatórios E Multirresíduosunclassified
“…Nesta etapa, a fase aquosa juntamente com a amostra é separada do solvente e os analitos extraídos são filtrados com sulfato de sódio anidro e o extrato diretamente injetado no cromatógrafo. 55 A técnica ELL-PBT apresenta como vantagem a simplicidade e eficiência, além do menor consumo de solventes, a ausência de outras etapas de clean up e a redução ou eliminação de etapas de evaporação e troca de solventes. Na ELL-RPBT, o nitrogênio líquido é utilizado para o congelamento da fase água/acetonitrila, tornando o processo mais rápido.…”
Section: Métodos Cromatográficos Confirmatórios E Multirresíduosunclassified
“…To quantify ametryn concentration in the different depths of the columns, herbicide was extracted from soil samples, using the solid liquid extraction technique with lowtemperature partitioning, proposed by Vieira et al (2007) and Goulart et al (2008).…”
Section: Methodsmentioning
confidence: 99%