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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Solid-Phase Microextraction of Pyrethroid Pesticides from Water at Low and Sub-ppt Levels at Different Temperatures

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Autor(es):
Barrionuevo, Wilma Regina ; Lanças, Fernando Mauro [2]
Número total de Autores: 2
Tipo de documento: Artigo Científico
Fonte: Journal of High Resolution Chromatography; v. 23, n. 7/8, p. 485-488, Aug. 2000.
Área do conhecimento: Ciências Exatas e da Terra - Química
Assunto(s):Cromatografia   Água
Resumo

Synthetic pyrethroids are increasingly being used for insect control on field crops because of their advantageous environmental properties such as short field life, broad spectrum of insecticide activity, and relatively low mammalian toxicity. In the present work, experimental conditions were optimized for trace analysis of pyrethroids in water by using solid-phase microextraction followed by capillary gas chromatography. Effects of temperature, SPME-fiber diameter, and matrix were studied. SPME used off-line with a gas chromatograph electron-capture detection (GC-ECD) showed a linear response over a wide concentration range. Our results showed a strong temperature effect on pyrethroid extraction yield. The detection limit after 5 min of SPME-fiber exposure to the samples changed from 1 ppb (at 30°C) to 0.1 ppt (at 90°C), which is a 10000 increase in pyrethroid detection. The standard deviations of the analyte peak area ratios were typically in the range of 1-7% at 30°C and of 3 to 15% at 90°C. Best conditions for pyrethroids analysis were achieved using high temperature solution and a 100 m polydimethylsiloxane fiber. No matrix (river water) influence was observed on detection of the investigated pyrethroids. (AU)

Processo FAPESP: 96/09269-5 - Análise de micropoluentes orgânicos em água através do acoplamento entre métodos de extração e métodos cromatográficos de alta resolução
Beneficiário:Fernando Mauro Lanças
Linha de fomento: Auxílio à Pesquisa - Temático
Processo FAPESP: 98/04017-3 - Análise de piretróides em água, através do acoplamento entre métodos de extração e métodos cromatográficos de alta resolução
Beneficiário:Wilma Regina Barrionuevo
Linha de fomento: Bolsas no Brasil - Pós-Doutorado