NDLI: Behavior of Np(V) in sodium diethylenetriaminepentaacetate (DTPA) solutions

Content Provider	Springer Nature Link
Author	Shilov, V. P. Fedoseev, A. M.
Copyright Year	2015
Abstract	The reduction of Np(V) to Np(IV) with diethylenetriaminepentaacetate (DTPA) ions in solutions with pH 1.5–5.5 was studied by spectrophotometry. The constant pH was adjusted using potassium hydrogen phthalate with the addition of hydrochloric acid or alkali. The reaction rate equation is V = -d[Np(V)]/dt = k[Np(V)]. The rate constant increases with increasing [DTPA] in the range 5–50 mM; with increasing pH from 2 to 5, the rate constant passes through a maximum at pH 3.0–3.5. The maximum is due to the fact that an increase in pH leads, on the one hand, to an increase in the yield of the Np(V) complex with the DTPA ion and, on the other hand, to a decrease in the concentration of Н$^{+}$ ions required for the transformation of NpO 2 + into Np$^{4+}$. In argon-saturated solutions, one Np(V) ion oxidizes one DTPA ion. The radical formed from DTPA transforms into products inactive toward Np(V). In the presence of О$_{2}$, the radical generates НО$_{2}$, which launches the reaction Np(IV) + НО$_{2}$ + Н$^{+}$ → Np(V) + Н$_{2}$О$_{2}$. Thus, Np(V) plays the role of a homogeneous catalyst of DTPA oxidation with molecular oxygen.
Starting Page	492
Ending Page	497
Page Count	6
File Format	PDF
ISSN	10663622
Journal	Radiochemistry
Volume Number	57
Issue Number	5
e-ISSN	16083288
Language	English
Publisher	Pleiades Publishing
Publisher Date	2015-10-10
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	neptunium(V) diethylenetriaminepentaacetate (DTPA) reduction kinetics Nuclear Chemistry Chemistry/Food Science
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry

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