Gas Adsorption Data Uncertainty and Propagation Analyses

摘要

Experimental uncertainties inherent to manometric gas adsorption techniques are identified,analysed,calculated and discussed.Contributions of these uncertainties to the amount of nitrogen adsorbed and to the BET specific surface area of a carbon black standard were evaluated.Inaccurate liquid nitrogen level control affects the equilibrium pressure and hence the amount of gas adsorbed.The sources of greatest(controllable)uncertainty are liquid nitrogen level control,sample preparation conditions and sample mass measurement.