Sorption methods have found wide application for the preconcentration of radionuclides. Chelating sorbents are of particular interest as sorption material. More efficient is the use of modified forms of the copolymer of maleic anhydride with styrene. For example, chelating sorbents, which are matrices on which organic compounds are fixed [1–18]. Recent publications indicate that the copolymer of maleic anhydride with styrene is a promising matrix for the preparation of chelating sorbents[19-28]. The main goal in the present work is to study the conditions for the preconcentration of uranium(VI) with a new chelating sorbent containing molon acid hydrazide fragments, followed by the determination of these ions by photometric spectrometry to extract uranium(VI) from sea water.