Carbon Analysis is conducted by the Desert Research Institute (DRI).
Starting with the January 2005 filters, DRI began using an upgraded TOR analyzer for the carbon analysis. The new procedures are described in the SOPs below.
Model 2015. New Method
Prefiring of quartz filters (2-106R5) (11/2005) (100 KB)
Model 2001. Previous Method
DRI Model 2001 Thermal/Optical Carbon Analysis (TOR/TOT) of Aerosol Filter Samples – Method IMPROVE_A (2-216R2) - Revision 3 (07/2008) (2.4 MB)