Abstract: The method for preparing cross-linked vinylaromatic polymers containing nitro groups having the general formula ##STR1## where R' is H, NO.sub.2, COOH, SO.sub.3 H, P(O)(OH).sub.2, or P(O)H(OH), m is from 60 to 99 and n is from 40 to 1, consists in treatment of the starting cross-linked polymers having the general formula ##STR2## where R is H, COOH, SO.sub.3 H, P(O)(OH).sub.2, or P(O)(OH), m is from 60 to 99 and n is from 40 to 1, with a mixture of an alkali metal nitrate and an acid agent, at a temperature from -5.degree. to 95.degree. C. The quantity of the alkali metal nitrate in the nitrating mixture is from 0.1 to 8 moles per mole of the starting cross-linked polymer.The method provides conditions for preparing cross-linked vinylaromatic polymers, containing nitro groups, having higher mechanical strength, high osmotic stability, and their volume in an ion-exchange column changes insignificantly as acid media are changed for alkaline, and vice versa.

Abstract: A method of preparing blood-compatible sorbents for recovering exo- and endogenic poisons which comprises sorption of the blood-serum albumin on an anion exchange resin, cation exchange resin, activated carbon or a styrene and divinylbenzene copolymer with a specific surface area of at least 20 m.sup.2 /g. Thereafter, the sorbed albumin is subjected to polycondensation at a temperature ranging from 10.degree. to 90.degree. C. The method according to the present invention practically does not change the initial porous structure of the sorbents, thus ensuring sorption of such compounds as bilirubin, uric acid, creatinine, barbituric acid derivatives, potassium and ammonium ions, phenols, indoles, skatoles.