Relative humidity and pH dependence of the vapor pressure of ammonium nitrate-nitric acid solutions at 25° C

1982 ◽  
Vol 16 (5) ◽  
pp. 993-1000 ◽  
Author(s):  
Arthur W. Stelson ◽  
John H. Seinfeld
Keyword(s):  
Nitric Acid ◽  
Relative Humidity ◽  
Vapor Pressure ◽  
Ammonium Nitrate ◽  
Ph Dependence ◽  
Acid Solutions ◽  
Nitric Acid Solutions

Triuranium octoxide dissolution by nitric acid solutions with addition of ammonium nitrate

2012 ◽  
Vol 127-128 ◽  
pp. 112-115 ◽  
Author(s):  
A.L. Smirnov ◽  
S.Yu. Skripchenko ◽  
V.N. Rychkov ◽  
A.M. Pastukhov ◽  
M.G. Shtutsa
Keyword(s):  
Nitric Acid ◽  
Ammonium Nitrate ◽  
Acid Solutions ◽  
Nitric Acid Solutions ◽  
Triuranium Octoxide

scholarly journals Pulse radiolysis study on the reactivity of NO3˙ radical toward uranous(iv), hydrazinium nitrate and hydroxyl ammonium nitrate at room temperature and at 45 °C

2020 ◽  
Vol 22 (9) ◽  
pp. 5188-5197 ◽  
Author(s):  
R. Musat ◽  
J. L. Marignier ◽  
C. Le Naour ◽  
S. Denisov ◽  
L. Venault ◽  
...  
Keyword(s):  
Nitric Acid ◽  
Ammonium Nitrate ◽  
Nuclear Fuel ◽  
Pulse Radiolysis ◽  
Room Temperature ◽  
Spent Nuclear Fuel ◽  
Acid Solutions ◽  
Nitric Acid Solutions ◽  
No3 Radical

Concentrated nitric acid solutions subjected to radiation produce radicals of extreme importance in the reprocessing of spent nuclear fuel.

The Extraction of Thorium from Nitric Acid Solutions by a Quaternary Ammonium Nitrate (Aliquat-336)

1964 ◽  
Vol 3 (3) ◽  
Author(s):  
P. Gerontopulos ◽  
L. Rigali
Keyword(s):  
Nitric Acid ◽  
Ammonium Nitrate ◽  
Ammonium Salt ◽  
Organic Phase ◽  
Quaternary Ammonium ◽  
Quaternary Ammonium Salt ◽  
Aliquat 336 ◽  
Acid Solutions ◽  
High Affinity ◽  
Nitric Acid Solutions

SummaryThe extraction of thorium from nitric acid solutions into xylene solutions of a quaternary ammonium salt (Aliquat-336) has been investigated. Aliquat-336 presenta a high affinity for thorium with a maximum of extraction in the range 3-4 M HNOThe species extracted into organic phase appears to be Th(NO

scholarly journals Neptunium extraction by N,N-dialkylamides

2020 ◽  
Vol 108 (9) ◽  
pp. 707-716
Author(s):  
Jarrod M. Gogolski ◽  
Peter R. Zalupski ◽  
Travis S. Grimes ◽  
Mark P. Jensen
Keyword(s):  
Nitric Acid ◽  
Solvent Extraction ◽  
Radioactive Waste ◽  
Partial Oxidation ◽  
Acid Solutions ◽  
Nitric Acid Solutions ◽  
Organic Solutions

AbstractSeparation of neptunium by solvent extraction has been based on tributylphosphate (TBP) for decades, but TBP is not fully incinerable, which adds to the burden of long-lived radioactive waste. Alternatives to TBP for uranium and plutonium extraction, such as the N,N-diakylamides, previously have been explored in the hopes of transitioning to an extractant that is incinerable. Four N,N-diakylamides, N,N-dihexylhexanamide (DHHA), N,N-dihexyloctanamide (DHOA), N,N-di(2-ethylhexyl)butanamide (DEHBA), and N,N-di(2-ethylhexyl)-iso-butanamide (DEHiBA) were considered in this work for their potential to extract millimolar concentrations of Np(IV), Np(V), and Np(VI) from nitric acid solutions into organic solutions containing 1 M extractant in Exxsol D60. Under these conditions the branching of the alkyl substituents affects the extractability of Np(VI) and Np(IV), causing three of the dialkylamides, DHHA, DHOA and DEHBA, to extract neptunium in the expected order Np(VI) > Np(IV) > > Np(V). In contrast, branched DEHiBA is so poor an extractant for Np(IV) that the extraction order becomes Np(VI) > > Np(V) > Np(IV) between 0.1 and 5.6 M HNO3 due to partial oxidation of the Np(V) in nitric acid.

Extraction of tetra- and hexavalent actinide ions from nitric acid solutions using some diglycolamide functionalized calix[4]arenes

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Rajesh B. Gujar ◽  
Parveen K. Verma ◽  
Prasanta K. Mohapatra ◽  
Mudassir Iqbal ◽  
Jurriaan Huskens ◽  
...  
Keyword(s):  
Nitric Acid ◽  
Solvent Extraction ◽  
Extraction Efficiency ◽  
Minor Actinide ◽  
Acid Solutions ◽  
Extraction Mechanism ◽  
Nitrate Ion ◽  
Nitric Acid Solutions ◽  
Actinide Ions ◽  
Acid Extractant

Abstract Neptunium is one of the most important minor actinide elements with some of its isotopes having very long half-lives, therefore necessitating its separation from acidic radioactive wastes. Solvent extraction of Np4+ and NpO2 2+ was studied using three multiple diglycolamide (DGA) extractants with n-propyl, n-octyl and 3-pentyl substituents termed as L I , L II and L III , respectively, in a mixed diluent of 5% isodecanol and 95% n-dodecane. For comparison purpose, the extraction of Pu4+ and UO2 2+ was carried out under identical conditions. The extraction efficiency of the ligands for the tetravalent ions followed the trend: L II  > L I  > L III , which changed to L III  > L II  > L I for the hexavalent ions. While the extraction of the tetravalent ions was reasonably good (ca. 90–98%) with an extremely low (5.0 × 10−5 M) ligand concentration, poor extraction (ca. 5–16%) of the hexavalent ions was seen even with a 20 times higher concentration of the ligand. In general, Pu4+ was better extracted than Np4+, while NpO2 2+ was marginally better extracted then UO2 2+. A ‘solvation’ type extraction mechanism was proposed based on the extraction profiles obtained as a function of the concentrations of the feed nitric acid, extractant as well as nitrate ion. The extracted species were found out to be M(NO3)4·mL and MO2(NO3)2·nL (M = Np or Pu, 1 < m < 2, n ≃ 1).

Sign in / Sign up

Export Citation Format

Share Document