- WEB EXCLUSIVE
- PE COFFEEHAUS
Under 40 CFR Part 53, the EPA evaluates various methods for monitoring the concentrations of those ambient air pollutants for which the agency has established National Ambient Air Quality Standards (NAAQSs).
1. EQPM-0311-195, by Grimm Technologies Inc., Douglasville, Ga. Model EDM 180 PM2.5: The new PM2.5 equivalent method is an analyzer that utilizes a measurement principle based on active sampling of ambient aerosols and contemporaneous analysis by means of a light-scattering technique for determination of particle size and mass concentration. It monitors light scattering continuous ambient particulate monitor, operated for 24 hours.
Because this new measurement approach is being approved for NAAQS compliance measurements for the first time, users are encouraged to consider the special nature of this method when introducing it into a SLAMS PM2.5 monitoring network. EPA Regional Offices can offer guidance in this regard.
2. EQL-0311-196, by the EPA's Office of Air Quality Planning and Standards, Research Triangle Park, N.C. Heated Ultrasonic Nitric and Hydrochloric Acid Digestion and ICP/AES Analysis for Lead (Pb) on TSP High-Volume Filters. The new equivalent method for Pb is a manual method that uses the sampling procedure specified in the EPA Reference Method for total suspended particulate matter (TSP) (High-Volume Method, 40 CFR Part 50, Appendix B), with a particular extraction and analytical procedure.
A sample of total suspended particulate matter (TSP) is collected on a glass fiber filter, using the sampler and procedure of the EPA Reference Method for the Determination of Suspended Particulate Matter in the Atmosphere (High-Volume Method) (40 CFR 50, Appendix B). The TSP sample is extracted with a solution of nitric and hydrochloric acid, heated in an ultrasonic bath to 80ºC for one hour, and brought to a final volume of 40 mL. The lead content of the sample extract is analyzed by Inductively Coupled Plasma-Atomic Emission Spectrometry (ICP-AES), based on EPA SW-846 Method 6010C.
The method description is available at www.epa.gov/ttnamti1/pb-monitoring.html.
3. and 4. EQPS-311-197, Thermo Fisher Scientific, Air Quality Instruments, Environmental Instruments Division, Franklin, Mass. Thermo Scientific Partisol[supreg] 2000-D Dichotomous Air Sampler
The two new equivalent methods for PM10 are both manual, gravimetric sampling methods employing a single particulate sampler configured for dual filter sampling and using a virtual impactor to separate the fine and coarse PM fractions for collection on separate filters.
The sampler is configured for dual-filter, single-event sampling of fine (PM2.5) and coarse (PM10-2.5) particles, using a virtual impactor to separate fine and coarse PM into two samples for collection on two separate filter membranes.
Use of the methods should also be in general accordance with the guidance and recommendations of applicable sections of the Quality Assurance Handbook for Air Pollution Measurement Systems, Volumes I and II.
SOURCE: Federal Register