Reference Method for the Determination of Particulate Matter as PM10
This method is for the measurement of the mass concentration of particulate matter with an aerodynamic diameter less than or equal to a nominal 10 micrometers (PM10) in ambient air collected over a 24-hour period. This method is specified for the determination of attainment and maintenance of primary and secondary National Ambient Air Quality Standards (NAAQS) for particulate matter.
The filter is weighed to a constant weight (to nearest 0.1mg) before and after sampling to determine the net weight (mass) gain due to collected PM10. The method doesn't specify a particular type of filter as long as the collection criteria are met. Typical filters used are 8"x10" quartz filters.
Air samples are drawn into the inlet of the sampler at a constant flow rate with a uniform face velocity. The inlet separates out the particles into one or more size fractions within the PM10 range. A separate filter is used for each size fraction. Once sampling is complete the filter is removed from the sampler and placed in a petri dish or manila folder and sent to the laboratory for analysis via gravimetric determination.
If there is more than one filter due to different size fractions being collected then the total PM10 for the sample is the sum of the weights of all the filters.
(40 CFR Part 50, Appendix J)
* The analytes and detection limits listed for each method represent the typical detection limits and analytes reported for that particular method. Keep in mind that analyte lists may vary from laboratory to laboratory. Detection limits may also vary from lab to lab and are dependent upon the sample size, matrix, and any interferences that may be present in the sample.