The extraction of UO2+2from nitric acid solutions by two neutral donors ligands (L), triphenylarsine oxide (Ph3AsO) and triphenylphosphine oxide (Ph3PO), in chloroform is investigated. At low HNO3acid concentrations (<2 M), UO22+is highly extracted as simple cation by Ph3AsO and slightly extracted by Ph3PO. The extraction constant of UO22+from low nitric acid medium is found to equal 1212 ± 120. At higher HNO3concentration (>2 M), UO22+is extracted by ion association mechanism as UO2(NO3)2- 2L, and the distribution ratio of UO22+using Ph3PO is found to be higher than that of Ph3AsO. This is interpreted by the extraction competition of HNO3for Ph3AsO. Spectroscopic investigations in the visible and IR regions supported the results obtained.