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Journal of Toxicology
Volume 2011, Article ID 419476, 9 pages
http://dx.doi.org/10.1155/2011/419476
Research Article

Laboratory and Field Testing of an Automated Atmospheric Particle-Bound Reactive Oxygen Species Sampling-Analysis System

1Center for Air Resource Engineering and Science, Clarkson University, Potsdam, NY 13699-5708, USA
2Department of Environmental Medicine, University of Rochester Medical Center, Rochester, NY 14627, USA

Received 20 October 2010; Accepted 20 January 2011

Academic Editor: M. Ian Gilmour

Copyright © 2011 Yungang Wang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

In this study, various laboratory and field tests were performed to develop an effective automated particle-bound ROS sampling-analysis system. The system uses 2 7-dichlorofluorescin (DCFH) fluorescence method as a nonspecific, general indicator of the particle-bound ROS. A sharp-cut cyclone and a particle-into-liquid sampler (PILS) were used to collect PM2.5 atmospheric particles into slurry produced by a DCFH-HRP solution. The laboratory results show that the DCFH and H2O2 standard solutions could be kept at room temperature for at least three and eight days, respectively. The field test in Rochester, NY, shows that the average ROS concentration was 8.3±2.2 nmol of equivalent H2O2 m−3 of air. The ROS concentrations were observed to be greater after foggy conditions. This study demonstrates the first practical automated sampling-analysis system to measure this ambient particle component.