Particulate matter in the atmosphere (optical density of filtered deposit)
Journal Article
·
· Annu. Book ASTM Stand.; (United States)
OSTI ID:5579868
Particulate matter in the atmosphere is determined by filtering the air which has been screened to remove particles above 40 ..mu..m through a definite circular area of filter paper for a given period of time of at least 1 hr. Duplicate samples are taken, and the optical density of the circular spots or stains is measured by reflectance or transmittance in comparison with blank filter paper. For comparison purposes, the optical density readings are converted into a concentration scale relating the optical density of the deposit to the volume of the air filtered and the area of the circular spot or to the size of the air sample in linear units.
- OSTI ID:
- 5579868
- Journal Information:
- Annu. Book ASTM Stand.; (United States), Journal Name: Annu. Book ASTM Stand.; (United States) Vol. 26; ISSN ASTSA
- Country of Publication:
- United States
- Language:
- English
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