DOI: https://doi.org/10.1007/s00107-016-1155-6

Abstract:   Several methods are available  for  obtaining  the  sorption isotherms  of  wood.  Among  these,  the  saturated  salt  and  dynamic  vapor  sorption methods  are  the most  frequently  used ones.  For the  first  time,  the  hygroscopic response  of  wood  obtained  using  these  two  methods  is  compared. This is  done  by determining  the  35 and 50 °C  adsorption  isotherms  of  juvenile  and  mature  wood of Pinus  pinea  L.  The hygroscopic  behavior  of  the  two types of wood is different, as the mature wood has a higher moisture content than the juvenile wood in the isotherms studied. Comparison of the static saturated salt method and dynamic vapor  sorption  shows  few  significant  differences between the equilibrium moisture content obtained by each method  during  the  adsorption  process,  both  in  a  point  by point comparison and in the comparison of quadratic polynomial forms of the Guggenheim Anderson de Boer model. Moreover, in both methods  the point  of relative humidity from which multilayer  sorption  predominates  over  monolayer sorption is similar.