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An automated sequential sampling system for particulate acid aerosols: description, characterization, and field
G D Thurston1, J E Gorczynski, P Jaques
1Nelson Institute of Environmental Medicine, NYU Medical Center, Tuxedo 10987.
Journal of Exposure Analysis and Environmental Epidemiology
|October 11, 1992
Summary
An automated system efficiently collects daily particulate acid aerosol samples, enabling weekly site visits. This method ensures data validity and reveals peak summer acidity levels.
Area of Science:
- Environmental Science
- Atmospheric Chemistry
- Analytical Chemistry
Background:
- Particulate acid aerosols impact air quality and human health.
- Traditional sampling methods require frequent site visits, limiting data collection efficiency.
Purpose of the Study:
- To develop and validate an automated sequential sampling system for particulate acid aerosols.
- To enable routine daily sample collection with reduced site visit frequency.
Main Methods:
- Design and operation of an automated sequential sampling system.
- Implementation of quality assurance (QA), quality control (QC), and data validation procedures.
- Field application across multiple metropolitan areas with external audits and interlaboratory comparisons.
Main Results:
- The system successfully collected 94% of all possible samples between May 1988 and December 1989.
- Weekly QA blanks and control filters confirmed negligible acid contamination or neutralization.
- Peak aerosol acidity levels were observed in summer, reaching 300-400 nmol/m3 (24-hr average).
Conclusions:
- The automated system provides a more convenient method for collecting extended daily records of particulate acid aerosol concentrations.
- The system demonstrates high sample collection success rates and data integrity.
- Findings contribute to understanding seasonal variations in aerosol acidity.