The paper presents the results of a study on the sorption of Cr(III) ions from aqueous solutions using phosphorus-containing sorbent based on butadiene-styrene rubber of the DSKK brand. This sorbent was synthesized by the reaction of oxidative chlorophosphorylation of butadiene-styrene rubber of the DSKK brand using PCl3, CCl4, H2SO4 and O2 under laboratory conditions. The effect of various parameters, such as the pH of the solution, the initial concentration of metal ions, the sorbent mass,

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... contact time of the phases, and the temperature on the sorption efficiency of Cr(III) ions have been studied. The sorption capacity and the degree of sorption were calculated on the basis of the concentration data obtained from the analysis of samples on the ISP MS 7700e mass spectrometer. A decrease in the degree of sorption of Cr(III) ions in acidic and alkaline media is established, and an acid-poor medium is the optimal condition for sorption. The increase in the temperature and mass of the sorbent positively affects sorption. The degree of sorption decreases with increasing initial concentration of Cr(III) ions. This indicates that the phosphorus-containing sorbent based on butadiene-styrene rubber of the DSSC brand has a limited number of active sites for sorption, and at lower concentrations almost all Cr(III) ions were sorbed. However, an increase in the initial concentration of Cr(III) ions leads to a rapid saturation of the surface of the sorbent. It has also been established that equilibrium is established at room temperature after 40 minutes. Experimental results have shown that a phosphorus-based sorbent based on butadiene-styrene rubber can be successfully used to extract Cr(III) ions from aqueous solutions.