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 studiedpotentiometrically (ISE-H+ glass electrode) at T ) 298.15 K. Investigations were carried out in NaNO3ionic 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, UO2L2+ and UO2L(OH)+ for the diamine systems (ethylenediamine, putrescine, cadaverine), UO2L2+and UO2LH3+ for spermidine, and UO2LH3+ and UO2LH24+ for spermine. In the systemUO2-poly(allyl)amine, four species, namely, UO2L2+, UO2LH3+, UO2LH24+, and UO2L(OH)+, are formed.Speciation profiles of the different systems and the sequestration capability of amines at various pH valuesare discussed. Some empirical relationships regarding the formation constants of complex species are alsoreported.
|Numero di pagine||7|
|Rivista||Journal of Chemical and Engineering Data|
|Stato di pubblicazione||Published - 2010|
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