6533b835fe1ef96bd129eb45

RESEARCH PRODUCT

Interactions of Dioxouranium(VI) with Amines in Aqueous Solution

Antonio GianguzzaSilvio SammartanoFrancesco CreaAlberto Pettignano

subject

CadaverineGeneral Chemical EngineeringInorganic chemistryEthylenediamineGeneral Chemistrydioxouranium; sequestrationMedicinal chemistrySpermidinestability constantschemistry.chemical_compoundchemistryaminespeciationStability constants of complexesuranylDiaminePutrescineQualitative inorganic analysisSettore CHIM/01 - Chimica AnaliticaPolyamine

description

The interaction of the dioxouranium(VI) ion with five low molecular weight polyamines (ethylenediamine, putrescine, cadaverine, spermidine, and spermine) and with poly(allyl)amine (15 kDa) was studied potentiometrically (ISE-H + glass electrode) at T ) 298.15 K. Investigations were carried out in NaNO3 ionic medium, at I ) 0.1 mol · L -1 (and 0.5 mol · L -1 for poly(allyl)amine only), in the pH range 3.5 to 5.5, before the formation of uranyl insoluble species. The results gave evidence for the formation of two species, namely, UO2L 2+ and UO2L(OH) + for the diamine systems (ethylenediamine, putrescine, cadaverine), UO2L 2+ and UO2LH 3+ for spermidine, and UO2LH 3+ and UO2LH2 4+ for spermine. In the system UO2-poly(allyl)amine, four species, namely, UO2L 2+ ,U O 2LH 3+ ,U O 2LH2 4+ , and UO2L(OH) + , are formed. Speciation profiles of the different systems and the sequestration capability of amines at various pH values are discussed. Some empirical relationships regarding the formation constants of complex species are also reported.

yearjournalcountryeditionlanguage
2010-03-29
10.1021/je901064phttp://hdl.handle.net/11570/1896133