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From practical requirement for gas removing ability of canister for organic gas with methyl bromide, life of the canister was tested and the breakdown times obtained were 32.3 min and 34.5 min at 5 ppm and 20 ppm of effluent gas concentrations, respectively. Sixteen canisters were tested and the mean deviations were 2.1 min and 1.8 min for each breakdown time, respectively. Concentration of influent methyl bromide gas for present test was 0.5% by volume in air stream of 30 1/min at 20°C. Logarithm of effluent gas concentration was approximately linear to contact time of canister with test air stream and the linear relationship coincided with equation derived by Danby et al. Canister used for present test was certified by the pr, oducing company that its breakdown time was 150 min or more when concentration of effluent gas exceeded 5 ppm using carbon tetrachloride as test gas, concentration of which was 0.5% by volume in influent air stream. The ratio of lives of the canisters for those two gases thus was about 1 : 5. Some consideration was done on adsorptibity of adsorbent from properties of intermolecular interaction of gas in adsorption state.

TEST ON GAS REMOVING ABILITY OF CANISTER FOR ORGANIC GAS WITH METHYL BROMIDE