Filters
Results 1 - 10 of 4882
Results 1 - 10 of 4882.
Search took: 0.038 seconds
Sort by: date | relevance |
Swingle, R.F.; Peterson, R.A.; Crawford, C.L.
Westinghouse Savannah River Co., Aiken, SC (United States). Funding organisation: USDOE, Washington, DC (United States)1997
Westinghouse Savannah River Co., Aiken, SC (United States). Funding organisation: USDOE, Washington, DC (United States)1997
AbstractAbstract
[en] Personnel conducted testing to determine the apparent solubility of benzene in potassium tetraphenylborate (KTPB) slurries. The lack of benzene vapor pressure suppression in these tests indicate that for a 6.5 wt percent solids KTPB slurry in 4.65 M Na+ salt solution at approximately 25 degrees Celsius, no significant difference exists between the solubility of benzene in the slurry and the solubility of benzene in salt solution without KTPB solids. The work showed similar results in slurry with 6,000 mg/L sludge and 2,000 mg/L monosodium titanate added. Slurries containing tetraphenylborate decomposition intermediates (i.e., 4,200 mg/L triphenylboron (3PB), 510 mg/L diphenylborinic acid (2PB) and 1,500 mg/L phenylboric acid (1PB) or 100 mg/L tri-n-butylphosphate (TBP)) also showed no significant difference in benzene solubility form filtrate containing no KTPB solids. Slurry containing 2,000 mg/L Surfynol 420 did exhibit significant additional benzene solubility, as did irradiated slurries. The vapor pressure depression in the irradiated slurries presumably results from dissolution of biphenyl and other tetraphenylborate irradiation products in the benzene
Primary Subject
Source
Nov 1997; 28 p; CONTRACT AC09-96SR18500; ALSO AVAILABLE FROM OSTI AS DE98051970; NTIS; INIS; US GOVT. PRINTING OFFICE DEP
Record Type
Report
Literature Type
Numerical Data
Report Number
Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
Mikhail, A.S.
Ain Shams University , Department of Chemistry, Cairo (Egypt)1984
Ain Shams University , Department of Chemistry, Cairo (Egypt)1984
AbstractAbstract
[en] Ion exchange systems found wide application in radiochemical separation of many radiotracers. In nuclear technology, ion exchange resins are usually used for purification of many of the fission products radio-nuclides as well as actinides and lanthanides . To achieve a good separation conditions, selectivity of the ion exchange system for the ion to be isolated is required. one approach to improve such selectivity is to manipulate the ionic form of the elements to be separated. This modification can be reached by the presence of certain complexing ligands. In this concern, the cation exchange behaviour of many metal ions was investigated in the presence of negatively charged ligands. On the other hand, the effect of neutral ligands on the ion exchange processes with organic resins has, so far, received little attention. Therefore, it was found of interest to add more information on the cation exchange behaviour of some radiotracer in the system comprising , the cation exchanger dowex 50 W -X8, the neutral ligand; benzylamine and different mineral acids
Primary Subject
Source
1984; 153 p; Available through liaison officer for Egypt , free charge; 17 tabs., 37 figs., 67 refs.; Thesis(Ms.c)
Record Type
Miscellaneous
Literature Type
Thesis/Dissertation
Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
Tachimori, S.; Yaita, T.; Suzuki, S.
Proceedings of the workshop on long-lived radionuclide chemistry in nuclear waste treatment1998
Proceedings of the workshop on long-lived radionuclide chemistry in nuclear waste treatment1998
AbstractAbstract
[en] A new cycloalkane-monoamide with high distribution ratio of U(VI) was obtained by tuning the ring size of the cycloalkane to give the highest basicity of oxygen donor atom of functional group; C=O of the monoamide, and by increasing lipophilicity of the amide molecule through appending long alkyl chain to the position with the least steric effect on metal bonding. Hence the 3.5-octyl-N-octyl-valerolactam designed revealed the highest extractability toward U(VI) without the third phase formation. In the study on a bidentate ligand-lanthanides(III): Ln(III) extraction system, to clarify the principal parameters of controlling distribution behaviour of Ln(III), the structural study by EXAFS was carried out, and the structure of the Ln(III)-ligand complex for several di-phosphine dioxides was discussed in relation to the number of the ligand coordinating to the Ln(III) ions, the basicity of the donor oxygen, and the nature of the metal-ligand bond. (author)
Primary Subject
Source
274 p; ISBN 92-64-16148-1;
; 1998; p. 179-188; Long-lived radionuclide chemistry in nuclear waste treatment; Villeneuve-les-Avignon (France); 18-20 Jun 1997; 11 refs.

Record Type
Book
Literature Type
Conference
Country of publication
Reference NumberReference Number
Related RecordRelated Record
INIS VolumeINIS Volume
INIS IssueINIS Issue
AbstractAbstract
[en] In model experiments with W, Hf, Th, and U radionuclides, a chemical system was developed for the separation of seaborgium from element 104 and heavy actinides, i.e., cation exchange on Dowex 50X8 from solutions containing 0.1-1.0 M HCl and 0.5-2.0 vol% H2O2. The system should be suitable for fast online experiments if seaborgium exhibits a non-uranium-like behaviour. Adding hydrogen peroxide to mixed HCl/HF solutions suppresses the partial sorption of W and, presumably seaborgium, on the cation exchanger. This way, the elution volume can be minimized. Prospects for anion exchange separations of group 6 from group 4 elements are also briefly discussed. (orig.)
Primary Subject
Record Type
Journal Article
Journal
Country of publication
ACTINIDE NUCLEI, ALPHA DECAY RADIOISOTOPES, BETA DECAY RADIOISOTOPES, BETA-MINUS DECAY RADIOISOTOPES, DAYS LIVING RADIOISOTOPES, ELECTRON CAPTURE RADIOISOTOPES, ELEMENTS, EVEN-EVEN NUCLEI, EVEN-ODD NUCLEI, HAFNIUM ISOTOPES, HEAVY ION DECAY RADIOISOTOPES, HEAVY NUCLEI, HYDROGEN COMPOUNDS, INTERMEDIATE MASS NUCLEI, ISOTOPES, LUTETIUM ISOTOPES, NEON 24 DECAY RADIOISOTOPES, NUCLEI, ODD-EVEN NUCLEI, OXYGEN COMPOUNDS, PEROXIDES, RADIOISOTOPES, RARE EARTH NUCLEI, SPONTANEOUS FISSION RADIOISOTOPES, THORIUM ISOTOPES, TRANS 104 ELEMENTS, TRANSPLUTONIUM ELEMENTS, TRANSURANIUM ELEMENTS, TUNGSTEN ISOTOPES, URANIUM ISOTOPES, YEARS LIVING RADIOISOTOPES
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
AbstractAbstract
[en] The ion transfer of UO22+ ion across an aqueous(w)/nitrobenzene(NB) interface was investigated by ion-transfer polarography using an aqueous electrolyte dropping electrode. It was found that the transfer of UO22+ from w to NB was facilitated by bis(diphenylphosphoryl)methane (BDPPM), and that the transfer reaction had irreversible characteristics. A potential generated at the UO22+ ion-selective electrode, which was prepared while referring to ion transfer data, revealed a reversible Nernstian response against the concentration of the UO22+ ion in an aqueous sample solution. The irreversible nature of the UO22+ transfer observed in the polarogram resulted from such slow processes involved in the ion transfer reaction as the adsorption/desorption of BDPPM or the UO22+-BDPPM complex at the w/NB interface. The feasibility of the electrolytic separation of uranium from neptunium and plutonium on the basis of a selective ion-transfer reaction is discussed. (author)
Primary Subject
Record Type
Journal Article
Journal
Analytical Sciences; ISSN 0910-6340;
; v. 14(1); p. 67-70

Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
AbstractAbstract
[en] The reproducibility, the small scale as well as the large scale variability of 137Cs extracted sequentially from the soil by using a modified Tessier procedure was investigated at several grassland sites in Bavaria/Germany and in the Chernobyl area. Because undisturbed grassland soils are never homogeneous with respect to their soil properties, all sequential extractions at the German sites were carried out at each plot separately for different soil layers (e.g., 0-2, 2-5, 5-10, 10-15, 15-20 and 20-30 cm). The results show that the coefficients of variation (CV) for the reproducibility of the extraction procedure for 137Cs was (with some exceptions) around 10-20% for all fractions. For the small scale variability of 137Cs (samples within an area of 10 x 10 m2) the values for the CV were (again with a few exceptions) in the same range. Compared to that, the large scale variability of extractable 137Cs (random soil samples within an area of 100 x 200 km2) was higher for all fractions, even though only moderately. The implications of these results with respect to a sampling design are discussed. (author)
Primary Subject
Source
17 refs.
Record Type
Journal Article
Journal
Journal of Radioanalytical and Nuclear Chemistry; ISSN 0236-5731;
; CODEN JRNCDM; v. 226(1-2); p. 47-53

Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
AbstractAbstract
[en] Extraction of As(III) and As(V) from sulphuric acids solutions of H2SO4 of various concentration (50-200 g/dm3 with Cyanex 923 dissolved in Exxsol 220/230) was studied and compared. Cyanex 923 can be considered as an effective arsenic extractant. Sulphuric acid is co-extracted. Extraction both of As(III) and As(V) occurs quickly and the equilibrium is obtained after 5 minutes. The isotherms of As(III) and As(V) extraction at various sulphuric acid concentrations were determined and used to model the multistage countercurrent process. Arsenic can be stripped with water. (author)
Primary Subject
Source
34 refs.
Record Type
Journal Article
Journal
Journal of Radioanalytical and Nuclear Chemistry; ISSN 0236-5731;
; CODEN JRNCDM; v. 228(1-2); p. 105-108

Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
AbstractAbstract
[en] 4-Octylphenylamine, decyl isonicotiniate, decyl nicotiniate, decyl 2-hydroxyethyl sulphide and its analog with partly fluorinated alkyl group were used for palladium(II) extraction from 3M HCl. The adsorption of these compounds at toluene/HCl solution was also studied and interpreted. 4-Octylphenylamine adsorbs at the hydrocarbon/HCl solution at much lower concentration range than other extractants and can be used as a phase transfer catalyst. The addition of 4-octylphenylamine increases the extraction rate with esters of pyridine carboxylic acids and decreases the time needed to obtain the equilibrium of extraction. (author)
Primary Subject
Source
9 refs.
Record Type
Journal Article
Journal
Journal of Radioanalytical and Nuclear Chemistry; ISSN 0236-5731;
; CODEN JRNCDM; v. 228(1-2); p. 109-111

Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
Shafek, S.S.
Cairo University, Inorganic Chemistry Department (Egypt)1979
Cairo University, Inorganic Chemistry Department (Egypt)1979
AbstractAbstract
[en] The increasing need to uranium and thorium for nuclear energy programmes has stimulated the development of many methods for their separation both in large amount and in trace. Of these methods, precipitation, ion exchange, adsorption and solvent extraction are the most important. These techniques, though have found much application for the separation of uranium , they their limitations and new methods are, therefore, required for the separation of these elements from aqueous solutions especially when they are present in low concentrations . For this reason, the relatively new techniques: foam separations have been investigated. In foam separation processes, separation occurs by virtue of differences in the surface activity of the substances to be removed. Until about two decades ago, only naturally surface - active substances could be separated by foaming. Metal ions are not naturally surface-active but, lately, it was discovered that foaming could also concentrate inorganic solutions
Primary Subject
Source
1979; 164 p; Available from Liaison Officer for Egypt. Free of charge; 2 tabs., 47 figs., 190 refs.; Thesis(Ms.c)
Record Type
Miscellaneous
Literature Type
Thesis/Dissertation
Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
AbstractAbstract
[en] Procedures for the separation and determination of 90Sr in liquid samples, with cation and anion exchangers have been described. Strontium, yttrium and other cations bind to the cation exchanger and are eluted from the column by means of nitric acid. Separation of yttrium and strontium from other cations is carried out on columns filled with strong base anion exchangers in nitrate form with alcoholic solutions of nitric acid. This separation method enables the determination of 90Sr through yttrium on a low-level gas flow α, β-counter, as well as through strontium on a low-level liquid scintillation counter by means of Cherenkov counting. Such procedures have been tested by the determination of 90Sr in water, wine, medium radioactive liquid waste samples, milk and clover samples. For comparison, the determination has also been carried out by the standard method. It has been showed that the developed procedures might produce a high efficiency in strontium separation and a satisfactory accuracy of determination. (author)
Primary Subject
Source
25 refs.
Record Type
Journal Article
Journal
Journal of Radioanalytical and Nuclear Chemistry; ISSN 0236-5731;
; CODEN JRNCDM; v. 242(1); p. 33-40

Country of publication
ALKALINE EARTH ISOTOPES, BETA DECAY RADIOISOTOPES, BETA-MINUS DECAY RADIOISOTOPES, BIOLOGICAL MATERIALS, BODY FLUIDS, CHROMATOGRAPHY, COUNTING TECHNIQUES, DAYS LIVING RADIOISOTOPES, EVEN-EVEN NUCLEI, FOOD, HOURS LIVING RADIOISOTOPES, HYDROGEN COMPOUNDS, INTERMEDIATE MASS NUCLEI, ISOMERIC TRANSITION ISOTOPES, ISOTOPES, LEGUMINOSAE, MAGNOLIOPHYTA, MAGNOLIOPSIDA, MATERIALS, MEASURING INSTRUMENTS, NUCLEI, ODD-ODD NUCLEI, OXYGEN COMPOUNDS, PLANTS, RADIOACTIVE MATERIALS, RADIOACTIVE WASTES, RADIOISOTOPES, SEPARATION PROCESSES, STRONTIUM ISOTOPES, WASTES, YEARS LIVING RADIOISOTOPES, YTTRIUM ISOTOPES
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
1 | 2 | 3 | Next |