The program involved the continuation of testing on charcoal mini-canisters that were developed and previously tested in Work Assignment 12 of the Contract. The results of the previous study are reported in EPA Report No. 460/3-84-014. In the study, additional testing was conducted both on mini-canisters previously exposed to a hydrocarbon-only blend, and on mini-canisters previously exposed to a hydrocarbon-methanol blend. Switching of exposure blends (between the hydrocarbon-only and the hydrocarbon-methanol blend) on the same set of mini-canisters was also undertaken to determine if any of the effects of the previous blend exposure were reversible. Breakthrough times, working capacities and canister weight gains were monitored for each of the mini-canisters during all testing. Laboratory humidity, temperature, and barometric pressure were also monitored to determine the effect of these parameters on mini-canister working capacity and weight gain. Hydrocarbon and methanol speciation were conducted on the vapors purged from eight of the canisters (four from the hydrocarbon-method blend exposures and four from the hydrocarbon-only blend exposures).

Includes bibliographical references. "December 1985." "EPA 460/3-85-010." "Contract No. 68-03-3162, Work Assignment 29." "EPA Project Officer: Craig A. Harvey." "Prepared for Environmental Protection Agency, Office of Mobile Source Air Pollution Control, Emission Control Technology Division."