Evaluation of an annular denuder/filter pack system to collect acidic aerosols and gases

Journal Article · Thu Dec 01 04:00:00 EST 1988 · Environ. Sci. Technol.; (United States)

DOI:https://doi.org/10.1021/es00177a013· OSTI ID:6103740

Koutrakis, P; Wolfson, J M; Slater, J L; Brauer, M; Spengler, J D; Stevens, R K; Stone, C L

A glass impactor was designed and evaluated along with an annular denude/filter pack system. The glass impactor has a 50% aerodynamic cutoff of 2.1 ..mu..m at a flow of 10 L min/sup /minus/1/ and allows a quantitative transfer of gases and fine particles to the annular denuder and filter pack components. Fine particle and gas concentrations, determined by using the glass impactor along with the annular denuder/filter pack, were in good agreement with those obtained with colocated reference samplers. Measurements of SO/sub 2/, HNO/sub 3/, and HNO/sub 2/ gases showed mean collection efficiencies of 0.993, 0.984, and 0.952, respectively, which compare well with predicted values. Additionally, it was found that artifact formation of nitrate and nitrite ions, representing about 5-10% of the concentrations of HNO/sub 3/ and HNO/sub 2/, occurs in the Na/sub 2/CO/sub 3/-coated annular denuder. Corrections for these artifacts were made with a second Na/sub 2/CO/sub 3/-coated annular denuder. The results of this pilot study suggest that the glass impactor/annular denuder/filter pack sampling system is suitable for measuring acidic aerosols and gases.

• Research Organization: Harvard Univ., Boston, MA (USA)
• OSTI ID: 6103740
• Journal Information: Environ. Sci. Technol.; (United States), Journal Name: Environ. Sci. Technol.; (United States) Vol. 22:12; ISSN ESTHA
• Country of Publication: United States
• Language: English

Related Subjects

500200* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AEROSOLS
AIR POLLUTION
AIR POLLUTION MONITORING
AIR SAMPLERS
CHALCOGENIDES
COLLOIDS
DESIGN
DISPERSIONS
EQUIPMENT
ERRORS
EVALUATION
FLUIDS
GASES
HYDROGEN COMPOUNDS
INORGANIC ACIDS
NITRIC ACID
NITROUS ACID
OXIDES
OXYGEN COMPOUNDS
POLLUTION
SAMPLERS
SOLS
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES