This method uses a Micromeritics Digisorb 2500 Analyzer for determining the distribution of surface area, pore volume (size) and length among the micropores, 60 nm (600 A) and smaller, as well as total surface area, total pore volume and average micropore diameter for porous substances. The computer software provides for the choice of many analytical variations including four different methods, eight different modes and fifteen different combinations of plots as described in the instrument "Instruction Manual," and also see NOTE.
ASTM UOP821-81 history
2002ASTM UOP821-81 Automated Micro Pore Size Distribution of Porous Substances by Nitrogen Adsorption and/or Desorption Using a Micromeritics Analyzer