Determination of the strong acidity of atmospheric fine-particles (<2. 5 mum) using annular denuder technology. Standard method, enhanced method
The report is a standardized methodology description for the determination of strong acidity of fine particles (less than 2.5 micrometers) in ambient air using annular denuder technology. The methodology description includes two parts: Part A - Standard Method and Part B - Enhanced Method. The Standard Method utilizes a denuder for removing ammonia and a filter assembly for determination of atmospheric strong acidity fine particle aerosols in ambient air, but does not account for potential interferences from nitric acid, ammonium nitrate aerosol or other ammonium salts which might bias the acidity measurement. The Enhanced Method adds an additional denuder upstream of the filter assembly to selectively remove acid gases (nitric acid vapors, nitrous acid and sulfur dioxide) from the gas stream prior to filtration. In addition, backup nylon and citric acid impregnated filters are used to correct for biases due to the dissociation of ammonium nitrate aerosol.
- Research Organization:
- Environmental Protection Agency, Research Triangle Park, NC (United States). Atmospheric Research and Exposure Assessment Lab.
- OSTI ID:
- 6533776
- Report Number(s):
- PB-93-178234/XAB; EPA-600/R-93/037
- Resource Relation:
- Other Information: See also PB--87-233318
- Country of Publication:
- United States
- Language:
- English
Similar Records
Evaluation and development of procedures for determination of sulfuric acid, total particle-phase acidity and nitric acid in ambient air-phase II. Final report
Loss of Fine Particle Ammonium from Denuded Nylon Filters
Related Subjects
ACID RAIN
AIR POLLUTION MONITORS
FILTRATION
PERFORMANCE TESTING
AEROSOLS
AMMONIA
ATMOSPHERIC CIRCULATION
CITRIC ACID
DISSOCIATION
FILTERS
GASES
NITRIC ACID
NITROUS ACID
NYLON
PARTICLES
PH VALUE
QUALITY CONTROL
SALTS
SULFUR DIOXIDE
TECHNOLOGY ASSESSMENT
VAPORS
ATMOSPHERIC PRECIPITATIONS
CARBOXYLIC ACIDS
CHALCOGENIDES
COLLOIDS
CONTROL
DISPERSIONS
FLUIDS
HYDRIDES
HYDROGEN COMPOUNDS
HYDROXY ACIDS
INORGANIC ACIDS
MATERIALS
MEASURING INSTRUMENTS
MONITORS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
OXIDES
OXYGEN COMPOUNDS
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
POLYAMIDES
POLYMERS
RAIN
SEPARATION PROCESSES
SOLS
SULFUR COMPOUNDS
SULFUR OXIDES
SYNTHETIC MATERIALS
TESTING
540120* - Environment
Atmospheric- Chemicals Monitoring & Transport- (1990-)