Previous peaks differ in size.
These last peaks represent the quantity of the analysis gas detected after the sample is saturated. The areas of these peaks represent the total volume of the loop since no adsorption occurred. We expect them to be identical because the same loop was used for each injection. The repeat analysis in chemisorption is very important because it indicates the amount of adsorbed gas that is reversible. From the first analysis and the repeat analysis one can differentiate between reversible or irreversible adsorption.