Evaluation of EPA method 5 probe deposition and filter media efficiency. Progress report, September 1975--June 1977
While developing an improved extractive stack sampler, Environmental Protection Agency Method 5 was evaluated to quantitate probe deposition and collection efficiency of several glass fiber filters accepted by the method. Monodisperse fluorescing dye aerosols from 0.6- to 4.4-..mu..m geometric diameter were generated from a vibrating orifice aerosol generator. Collection efficiencies were measured for MSA 1106 BH, Reeve-Angel 934AH, and Whatman GF/A and GF/C glass fiber filters at operating velocities of 5.2 and 10.3 cm/s. Efficiencies of these four filters were comparable, ranging from 99.6 to 99.8 percent against the 0.6-..mu..m aerosol and above 99.9 percent for aerosols larger than 1.0 ..mu..m. Probe deposition of a large (13.4-..mu..m mass median diameter) glass bead aerosol was 94 percent. Probe deposition of a 2.0-..mu..m fly-ash aerosol was 10.5 percent, with approximately half deposited in the nozzle. Only 1.5 percent of a 1.2-..mu..m dye aerosol deposited in the probe. These measurements emphasize the importance of consistent probe washing procedures, lower gas velocity in the probe nozzle, fewer bends and diameter changes, and smoother transition between probe components in the design of an improved sampler.
- Research Organization:
- Los Alamos Scientific Lab., NM (USA)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 7091551
- Report Number(s):
- LA-6899-PR
- Country of Publication:
- United States
- Language:
- English
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