Applied Physics and Mathematics Annotation << Back CHITIN&#63162; AND CHITOSAN&#63162;BASED MATERIALS FROM DIFFERENT SOURCES FOR RADIONUCLIDES ADSORPTION A.N. VELESHKO I.E. VELESHKO E.V. RUMYANTSEVA Novel chitin- and chitosan-based materials (CChM) were fabricated from diff erent objects like perishing bees and higher basidiomycetes. Obtained materials have been tested in adsorption experiments with uranium and strontium. Comparative analysis showed correlation between radionuclides adsorption effi ciency and composition of CChM. Melanin containing CChM proved to be more eff ective in uranium and strontium adsorption processes. All of investigated CChM had high adsorption properties in uranium adsorption processes. For chitin made from perishing bees distribution coeffi cients (Kd) of UO2 2+reached 8,1·103 ml/g. For others CChM they had 2·103 ml/g value. It has been noticed that chitin containing materials were more eff ective than chitosan containing. For UO2 2+ distribution coeffi cients in processes of adsorption on chitosan made from perishing bees were lower and reached only 1,15·103 ml/g. Maximum of strontium Kd reached in interaction with chitin-melanin glucan complex Mycoton (Кd =1,2·103 ml/g). Presence of melanin depended on adsorption and precipitation of radionuclides in solutions. Melanin water solution (0,1 %) can hold uranium (100 mg/l) in pH range 1…9,5. Degradation of chitin-melanin complex made from perishing bees in manufacturing process under oxidizing conditions (Н2О2 or Н2О2+HCl) may explain the reducing of its adsorption effi ciency. Keywords: Chitin-melanin complex, Chitin-melanin glucan complex, Adsorption, Precipitation, Radionuclides, Perishing bees, Higher Basidiomycetes. Contacts: E-mail: Veleshko_AN@nrcki.ru, E-mail: Veleshko_IE@nrcki.ru, E-mail: Rumyantseva_EV@nrcki.ru Pp. 12-18.