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

Autor(es)

Barrionuevo, Wilma Regina ; Lanças, Fernando Mauro ^[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