An Evaluation of the 37mm Cassette for Sampling an Airborne Particulate Dust
Public Deposited- Last Modified
- February 28, 2019
- Creator
-
Wood, Mark Wendell
- Affiliation: Gillings School of Global Public Health, Department of Environmental Sciences and Engineering
- Abstract
- The use of the 37 mm cassette for sampling total dust in industrial hygiene is well established. This method is used to make full shift and short-term exposure measurements. Environmental levels of ranitidine hydrochloride are typically in the ug/m^3 range. This necessitates taking short-term samples at flows markedly higher than the usual flow of 2 LPM. The results of these measures should be comparable. If not, then a bias exists in the method of collection in this flow range. An evaluation of the cassette to sample airborne ranitidine was completed by comparing paired samples with respect to concentration obtained and particle size sampled. Pairs were run at 2 and 4 liters per minute. No significant difference in concentration was found in pairs taken in the Fette and dispensing areas. The particle size distributions sampled at 2 and 4 liters per minute were very similar. Thus, no bias was detected in the sampling method between 2 and 4 LPM. Full shift and short-term measures are comparable. Analysis of the cassette indicates that significant quantities of ranitidine are depositing on the wall. In the Fette room more ranitidine deposited at low flow than at high flow. This indicates a possible residence time phenomenon is responsible. Data from the dispensing area indicates wall deposition is equal between 2 and 4 LPM. Possible explanations include sedimentation, impaction and electrostatic effects.
- Date of publication
- August 1989
- DOI
- Resource type
- Rights statement
- In Copyright
- Advisor
- Couch, Nelson W.
- Harris, Robert L.
- Flynn, Michael
- Degree
- Master of Science in Public Health
- Academic concentration
- Industrial Hygiene
- Degree granting institution
- University of North Carolina at Chapel Hill
- Graduation year
- 1989
- Language
- Deposit record
- ad7e9272-7c4f-43e0-afeb-7a5f2526ad76
Relations
- Parents:
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