ADSORPTION CAPACITIES OF ACTIVE CARBON TUBES FOR SAMPLING ATMOSPHERIC VINYL CHLORIDE VAPOR

Abstract

Adsorption capacities of sampling tubes packed with various kinds of active carbons for collecting vinyl chloride vapor were measured. Among the active carbons with identical particle size, those made from coconut shell and wood were more effective than those from petroleum pitch giving longer breakthrough times. The tubes packed with active carbons of smaller particle sizes adsorbed vinyl chloride vapor for longer periods than those with larger particle sizes. The break-through time in adsorbing vinyl chloride flow using active carbon tubes containing 150 mg carbon of a definite type in a glass tube of 4 mm inside diameter varied depending on the sampling conditions, i.e., the active carbon tube adsorbed the vapor for a longer period when the sampling rate was slower and the humidity in the flow was low.