NDLI: Underestimation of sulfate concentration in PM2.5 using a semi-continuous particle instrument based on ion chromatography.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Yao, Xiaohong Shairsingh, Kerolyn Lam, Ping Hai Evans, Greg J.
Description	Country affiliation: Canada Author Affiliation: Yao X ( Southern Ontario Centre for Atmospheric Aerosol Research, University of Toronto, M5S3E5 Toronto, Ontario, Canada.)
Abstract	Recently, a variety of ion-chromatography-based semi-continuous particle instruments such as the Dionex gas particle ion chromatograph (GP-IC), wet-annular denuder/steam-jet aerosol collector (WAD/SJAC), particle-into-liquid sampler with ion chromatograph (PILS-IC), gas and aerosol monitoring system (GAMS) have been introduced for measuring particle chemical components in the atmosphere. It has been reported that sulfate concentrations in PM2.5 measured by these semi-continuous particle instruments correlate well with those measured by other semi-continuous instruments such as the Aerodyne aerosol mass spectrometer (AMS), R&P 8400S and R&P 8400N analyzers, and Thermo model 5020 sulfate particle analyzer and at times exhibit a unity slope. However, the sulfate concentration measured by some of these semi-continuous instruments has been reported to be underestimated by 20-50%, as compared to that in PM2.5 filter samples. In this study, numerous potential causes for underestimation of the sulfate concentrations by the GP-IC were investigated. We found a 30-40% negative artifact arising from an improper calibration procedure inherent within the instrument design. An improved calibration procedure was developed and it substantially reduced the sulfate concentration difference between the GP-IC measurements and PM2.5 filter samples from 36% to 5%.
File Format	HTM / HTML
ISSN	14640325
Issue Number	6
Volume Number	11
e-ISSN	14640333
Journal	Journal of Environmental Monitoring
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2009-06-01
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Discipline Environmental Health Air Pollutants Analysis Chromatography, Ion Exchange Methods Environmental Monitoring Particulate Matter Sulfates Calibration Instrumentation Standards Particle Size Sensitivity And Specificity Journal Article Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Public Health, Environmental and Occupational Health Management, Monitoring, Policy and Law

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