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

Author(s)

Barrionuevo, Wilma Regina ; Lanças, Fernando Mauro ^[2]

• Document type: Journal article
• Source: Journal of High Resolution Chromatography; v. 23, n. 7/8, p. 485-488, Aug. 2000.
• Field of knowledge: Physical Sciences and Mathematics - Chemistry

Abstract

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)

• FAPESP's process: 96/09269-5 - Analysis of organic micropollutant in water through combining extraction methods and high resolution chromatographic methods
• Grantee: Fernando Mauro Lanças
• Support type: Research Projects - Thematic Grants