Quantitative analysis of methyl parathion pesticides in a polydimethylsiloxane microfluidic channel using confocal surface-enhanced Raman spectroscopy

Applied Spectroscopy
Donghoon LeeSanghoon Lee

Abstract

A fast and ultra-sensitive trace analysis of methyl parathion pesticides in a polydimethylsiloxane (PDMS) microfluidic channel was investigated using confocal surface-enhanced Raman spectroscopy (SERS). A three-dimensional PDMS-based passive micromixer was fabricated for this purpose. This PDMS micromixer showed a high mixing efficiency because a strong chaotic advection was developed by the simultaneous vertical and transverse dispersion of the confluent streams. The confocal SERS signal was measured after methyl parathion pesticides were effectively adsorbed onto silver nanoparticles while flowing along the upper and lower alligator-teeth-shaped PDMS channel. A quantitative analysis of the methyl parathion pesticides was performed based on the measured peak height at 1246 cm-1. Our method has a detection limit of 0.1 ppm. This value satisfies the requirement recommended by the Collaborative International Pesticides Analytical Council (CIPAC) for the determination of methyl parathion in pesticide formulations. This study demonstrates the feasibility of using confocal SERS for the highly sensitive detection of methyl parathion pesticides in a PDMS microfluidic channel.

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Citations

Apr 11, 2007·Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry·Sungyong KimSanghoon Lee
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Feb 24, 2007·Analytical and Bioanalytical Chemistry·Jaehyun JungSanghoon Lee
Nov 15, 2007·Analytical and Bioanalytical Chemistry·Katharina HeringJürgen Popp
Oct 31, 2008·Analytical and Bioanalytical Chemistry·Hai-Fang Li, Jin-Ming Lin
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