Sulfuric Acid

Early NCASI work on sulfuric acid measurement resulted in the development of the controlled condensation method, NCASI Method 8A (CTM-013), for use on recovery furnaces. EPA Method 8, the promulgated reference method for sulfuric acid, was later modified (as CTM-013a and CTM-013b) with a front-half filter for use on other combustion sources on the basis of NCASI studies. More recent NCASI work evaluates a cartridge-based method that eliminates the potential for biased measurements with other methods.