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Thorium
Items for "Thorium"
Distribution studies on Th(IV), U(VI) and Pu(IV) using tri-n-butylphosphate and N,N-dialkyl amides
Distribution studies on U, Pu and Th have been carried out employing tri-n-butyl phosphate (TBP) as extractant to optimise the conditions for the reprocessing of spent fuel of proposed Th based Advanced Heavy Water Reactor (AHWR)...
Keywords: Uranium, Thorium, Plutonium, Amide, TBP
04/2006 | Radiochimica Acta, Oldenbourg WissenschaftsverlagThe aqueous complexation of thorium with citrate under neutral to basic conditions
The aqueous complexation of thorium with citrate was investigated under neutral to basic conditions and over a broad range of ionic strengths...
Keywords: Thorium, Citrate, Aqueous, Solution, Structure
04/2006 | Radiochimica Acta, Oldenbourg WissenschaftsverlagThird phase formation in the extraction of Th(NO3)4 by tri-2-methyl butyl phosphate from nitric acid media
Third phase formation in the extraction of Th(IV) by tri-2-methyl butyl phosphate (T2MBP) in various diluents such as n-dodecane, n-tetradecane and n-hexadecane from nitric acid media has been investigated for the first time...
Keywords: Third phase formation, Tri-2-methyl butyl phosphate, Extractant, Thorium, Fuel reprocessing
06/2006 | Radiochimica Acta, Oldenbourg WissenschaftsverlagInfluence of soil humic acid and fulvic acid on sorption of thorium(IV) on MX-80 bentonite
Th(IV) is considered herein as a chemical analogue of other actinides (IV). Effect of pH, ionic strength and humic acid/fulvic acid concentrations on the sorption of thorium(IV) to MX-80 bentonite was studied by batch technique...
Keywords: Sorption, Bentonite, Thorium, Humic acid, Fulvic acid
08/2006 | Radiochimica Acta, Oldenbourg WissenschaftsverlagIon interaction (SIT) coefficients for the Th4+ ion and trace activity coefficients in NaClO4, NaNO3 and NaCl solution determined by solvent extraction with TBP
Trace activity coefficients of the Th4+ ion in dilute to concentrated NaClO4, NaNO3 and NaCl solutions ([H+]=0.01−0.02 M) have been determined at 22 °C from liquid-liquid phase equilibria with 10−50 vol.% TBP in n-dodecane...
Keywords: Thorium, TBP, Extraction, Activity coefficients, SIT
09/2006 | Radiochimica Acta, Oldenbourg WissenschaftsverlagComplexing properties of α-isosaccharinate: thorium
The complexation of Th with α-isosaccharinate has been studied using liquid–liquid-extraction techniques...
Keywords: Thorium, α-Isosaccharinate, Complexation, Stability constants, Liquid-liquid extraction
09/2006 | Radiochimica Acta, Oldenbourg WissenschaftsverlagInvestigation of complexation of thorium by humic acid using chemically immobilized humic acid on silica gel
To model the influence of humic substances on the migration of tetravalent actinides (Pu, Np, U) in and around nuclear waste repositories we have immobilized humic acid on silica gel and investigated its complexation of Th(IV)...
Keywords: Humic acid, Thorium, Conditional interaction constant (beta)
09/2006 | Radiochimica Acta, Oldenbourg WissenschaftsverlagStudies on protonation and Th(IV) complexation behaviour of dihydroxybenzenes in aqueous 1 M NaClO4 medium
Complexing behaviour of three dihydroxybenzenes (DHB) namely, hydroquinone, resorcinol and catechol with Th(IV) along with their protonation constants were studied in 1 M NaClO4 medium at 23±0.5 °C, using pH titration technique...
Keywords: Thorium, Dihydroxybenzene, Catechol, Resorcinol, Hydroquinone
12/2006 | Radiochimica Acta, Oldenbourg WissenschaftsverlagSupercritical fluid extraction of thorium from tissue paper matrix employing organophosphorus reagents
Feasibility of supercritical CO2 extraction of thorium from tissue paper matrix was studied and various organophosphorus reagents (TBP, TOPO, TPP, TPPO, TBPO) were evaluated as co-solvent...
Keywords: Thorium, Supercritical CO2, Organophosphorus reagent, Tissue paper, Extraction efficiency
12/2007 | Radiochimica Acta, Oldenbourg WissenschaftsverlagSpeciation of An(IV) (Pu, Np, U and Th) in citrate media
The acquisition of additional data concerning actinide decorporation is planned under the French nuclear and environmental toxicology program.
Citric acid is a fundamental biological constituent found at relatively high concentrations in blood plasma and is involved in many biological processes.
Spectrophotometry was the primary method used to determine the speciation of An(IV)-citrate systems (Th, U, Np, Pu)...
Keywords: Plutonium, Neptunium, Uranium, Thorium, Citric acid
03/2008 | Radiochimica Acta, Oldenbourg Wissenschaftsverlag