||Development of Sampling Methodology for Dilution Air Sampling of Condensible Emissions from Stationary Sources.
Farthing, W. E. ;
Ward., T. E. ;
||Southern Research Inst., Birmingham, AL.;Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab.
Flue gases ;
Air filters ;
Gas injection ;
Field tests ;
Air pollution control equipment ;
Air pollution sampling ;
Laboratory tests ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
The report describes the initial development of a technique using dilution of stack gas with conditioned ambient air for measurement of the particulate mass of condensible emissions from stationary sources. The methodology developed is designed for widespread application to measure emissions which are in the vapor phase at temperatures greater than that of the Method 5 filter and which immediately condense to the particulate phase upon mixing in a temperature-controlled chamber with air that has been cooled, dried, and filtered. The front half of the condensibles air dilution train (CADT) is a Method 5 probe and filter. The promulgated EPA Method 17 or the PM-10 methods (with a glass-lined probe) could be used for the CADT front half. The portion of the train for collection of condensibles (back half) includes a dilution air injection cone and a mixing chamber followed by a separate filter for condensibles. The temperature selected for the separate filter for condensibles is 20 C, and the dilution factor is 15:1 on a volume basis, high enough to prevent condensation of moisture. In the field testing, the stack gas condensible emission concentrations measured by the CADT ranged from 25.2 to 27.6 mg/dscm, and the average difference between the CADT and the impinger catch (IC) approach was 2%.