Research results of the capacity of foam polymer sorbents on the basis of multicomponent polymer mixtures for heavy metals, experimental data on the establishment of the effect of the ratio of polymer components, temperature, and pH of the medium on the regularity of the change in the sorption capacity have been presented. The real possibility of the chemical modification of the foam polymer sorbents has been shown with the aim of achieving high results in increasing the sorption capacity for a number of heavy metals.