Adsorbed water and gases can affect the weight of the porous carbon. Some times 6-7% weight loss can occur during the degassing of the sample. Will this weight loss affect the calculation of C, H,N and S ?
Of course yes, if you are analysing for instance an activated carbon, a char obtained from biomass gasification etc. The CHNS analysis will be affected by adsorbed gases and moisture: for instance, adsorbtion of H2O and CO2 from lab atmosphere will affect the result of H and C, respectively. This would not appen only if you are analysing a spent, already saturated carbon. My recommendation is that you should identify a reproducible protocol (to eventually pre-treat and) to store your samples before CHNS analyses (see for instance Article Characterization of Biochar from Fast Pyrolysis and Gasifica...
yes, adsorption of H2O and CO2 from the atmosphere will affect the result of CHN
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