Cadmium adsorption by hematite has been investigated at 25-100 degreesC. The evaluation of experimental data was made, using the three-plain (drop Fe+...drop FeO-...counter plain) constant capacitance model. The structure of hematite surface and of cadmium complexes was also considered. The computer program for calculation of cadmium adsorption onto hematite at 25-100 degreesC in 0-1m NaNO3 is available. (C)2001 Academic Press.