The chelating fibrous “filled” sorbents POLYORGS type with hydrazidine and amidoxime complexing groups (POLYORGS 33) and modified by reagent 3,6-bis-[(2-arsonophenyl)azo]-4,5-dihydroxy-2,7-naphtalen disulphoacid (Arsenazo-III) POLYORGS 33AIII pattern had been synthesized. The sorption ability of these materials were examined in the case of 241Am, 239Pu, 237Np, 233U, and 152Eu pre-concentration from simulated ground water solutions. It was found that all radionuclides above in indicator amounts (~10-5M) under preliminary experiments were recovered almost completely. POLYORGS 33 and POLYORGS 33AIII samples showed as well fast kinetics on the sorption process above.The derivatives of ethers of phosphoric acid, namely O-(2-alkyl)(diéthylcarbamoylmethyl)phenylphosphinates (O2ADECMPP), were synthesized and examined on liquid-liquid extraction of TRlPs, Lantanides and Tc (VII) from nitric acid solutions. A nonlinear increase of distribution coefficients (DM) as the function of the carbon radical extension on radionuclides extraction by O2ADECMPP solutions in meta-nitrobenzotriftoride (Ftoropol-723), or 1,2-dichlorethane had been found. Maximum of a distribution coefficients are found at n = 9 (R = CnH2n+1) for all radionuclides used. However in all further experiments easy available and equally efficient O2EHDECMPP reagent was used.It was shown that maxima of DM for Am(III), and Eu(III) extraction by 02EHDECMPP in 1,2-dichlorethane are at [HNO3]=3M ([R] = 0,1M; DAm = 1,45 and DEu = 1,02). For Pu(IV), and U(VI) extraction the increase of acid concentration in the range [HNO3] from 0.1M to 5M leads to the growth of the distribution coefficients, and at [R]=0,01M values of DPuchanges from 0.48 to 35, and for Du from 0.057 to 4.8. On the contrary, for Tc(VII) extraction by 02EHDECMPP in 1,2-dichlorethane the increase of HNO3 concentration in the solution causes noticeable slowing-down of the distribution coefficients, and DTc in the range [HNO3] from 0.1M to 5M decreases from 9.6 to 0.013 ([R] = 0,1M).Dependencies of the distribution coefficients for TRU's, Lantanides and Tc(VII) on reagent concentration were measured under 3M HNO3. For Am(III), Eu(III), and Tc(VII) it is shown that the increase of reagent concentration in the range [R] from 0.025M to 0.1M leads to the growth of the distribution coefficients for DAm from 0.057 to 1.45, for DEu from 0.055 to 1.02, and for DTc from 0.01 to 0.12. In the logarithm coordinates of DAm and DEu values on [R] dependence slope is close to two, upon which can be considered that extractable complex composition could be as Am.2R and Eu.2R. For Tc(VII) extraction the solvate number in the similar conditions is about 1.5. Probably, in the extraction system two different Tc complexes: mono- and bi-coordinated species were formed.For Pu(IV), and U(VI) it was shown that the increase of reagent concentration in the range [R] from 10-4M to 0.01M leads to the growth of the distribution coefficients for DPu from 0.08 to 11, for DU from 0.02 to 3.2. Values of a solvate number calculated from the slop of these plots above for Pu(IV) and U(VI) are close to one, and we considered that extractable complex composition for these elements could be as MR.For TRU's in comparison with extraction capacity of O2ADECMPP and well known phosphorous containing compounds the ratio has been obtain: DAm(TBP): DAm(Dialkylmethylphoshanates): DAm(02ADECMPP): DAm(Diphenyldibuthyl(carbamoylmethyl)phosphineoxide) = 1: 5.101: 2,5.104: 5.104. For Tc (VII) it was found that the best extractant for this element is O2ADECMPP.On the basis of O2ADECMPP compounds original chelating granulated sorbents were synthesized which were tested to respect of Pu(IV) isolation from nitric acid solutions.