Standard Test Method for Determination of Iodine Number of Activated Carbon
The iodine number is a relative indicator of porosity in an activated carbon. It does not necessarily provide a measure of the carbon's ability to absorb other species. Iodine number may be used as an approximation of surface area for some types of activated carbons (see Test Method ). However, it must be realized that any relationship between surface area and iodine number cannot be generalized. It varies with changes in carbon raw material, processing conditions, and pore volume distribution (see Definitions D2652). The presence of adsorbed volatiles, sulfur; and water extractables may affect the measured iodine number of an activated carbon.
