Total Suspended Particulate (TSP) Determination (Appendix B to Part 50 - Reference Method for the Determination of Suspended Particulate Matter in the Atmosphere (High-Volume Method) - Mass concentrations of total suspended particulate in ambient air is determined using a high-volume sampler that is designed to collect particles up to 25-50 micrometers (µm; aerodynamic diameter). Particles are collected on a glass fiber filter with collection efficiency of 99 percent on 0.3 µm (DOP) particles. The particulate loading is determined gravimetrically by accurately weighing the desiccated filter per the EPA procedures. Typically, particle sizes measured range from 0.3 to 50 microns.
Particulate Matter Less Than or Equal to Ten Microns (PM10) Determination (Appendix M to Part 50 - Reference Method for the Determination of Particulate Matter as PM10 in the Atmosphere) - Mass concentrations of particulate matter with an aerodynamic diameter less than or equal to 10 micrometers (PM10) in ambient air is determined using a sampler that is designed to inertially separate into one or more size fractions within the PM10 size range. Particles are collected on filters that meet the requirements of 99 percent or better collection efficiency on 0.3 µm (DOP) particles at the operating velocity, an integrity requirement of ±5 µg/m3, and an alkalinity of <25 microequivalents/gram of filter. The particulate loading is determined gravimetrically by accurately weighing the desiccated filter per the EPA procedures. Typical particle sizes measured range from 0.3 to 10 microns.
Particulate Matter Less Than or Equal to 2.5 Microns (PM2.5) Determination (Appendix L to Part 50 - Reference Method for the Determination of Fine Particulate Matter as PM2.5 in the Atmosphere) - Mass concentrations of particulate matter with an aerodynamic diameter less than or equal to 2.5 micrometers (PM2.5) in ambient air is determined using a sampler that is designed to inertially separate size fractions within the PM2.5 size range. Particles are collected on a polytetrafluoroethylene (PTFE) filter that meets the requirements specified by the method. The particulate loading is determined gravimetrically by accurately weighing the desiccated filter per the EPA procedures.
