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Lopez Reyes, C.; Cardenas Puebla, S.
6. Seminar of the IIE-ININ-IMP on technological specialties. Topic 12: analytical chemistry
6. Seminar of the IIE-ININ-IMP on technological specialties. Topic 12: analytical chemistry
AbstractAbstract
[en] The instrumental activation analysis is a technique relatively quickly that help to know the elemental composition of materials. It is used mainly in the trace elements determination but in the case of major elements it is necessary to make some considerations as the different nuclear reactions carried out due to the neutron flux is a mixture of thermal and fast neutrons. This could be interpreted for the presence and or erroneous quantification about some elements. In this work, is described the way in which was analyzed a container piece with approximately a 85% of aluminium. The elements Zn, Mn, Sb, Ga, Cu, Cl and Sm were determined. (Author)
Original Title
Estudio multielemental en aluminio por la tecnica de analisis por activacion
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Instituto de Investigaciones Electricas, Cuernavaca (Mexico); Instituto Nacional de Investigaciones Nucleares, Mexico City (Mexico); Instituto Mexicano de Petroleo, Mexico City (Mexico); 98 p; 1992; [8 p.]; Instituto Nacional de Investigaciones Nucleares; Salazar (Mexico); 6. Seminar of the IIE-ININ-IMP on technological specialities; 6. Seminario IIE-ININ-IMP sobre especialidades tecnologicas; Salazar (Mexico); 15 Jul 1992
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Miscellaneous
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Fenton, G.E.
Funding organisation: Australian Research Council, Canberra, ACT (Australia)
Funding organisation: Australian Research Council, Canberra, ACT (Australia)
AbstractAbstract
[en] Radiochemical analysis of aragonitic fish otoliths provides a useful approach to validating ages obtained by more common methods. The history of applications of radiometry using short-lived natural isotopes to clams, Nautilus, living corals and fish otoliths is briefly reviewed. The biogeochemical assumptions required for successful use of these techniques are discussed, and the appropriate mathematical treatments required for data analysis are outlined. Novel normalization techniques designed to widen the validity of this approach are proposed. Desirable lines of further research are also briefly discussed. 38 refs., 1 tab
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Journal Article
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Numerical Data
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Australian Journal of Marine and Freshwater Research; ISSN 0067-1940;
; CODEN AJMFA4; v. 43(5); p. 913-922

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ACTINIDE NUCLEI, AGE ESTIMATION, ALPHA DECAY RADIOISOTOPES, ANIMALS, AQUATIC ORGANISMS, BETA DECAY RADIOISOTOPES, BETA-MINUS DECAY RADIOISOTOPES, CARBON 14 DECAY RADIOISOTOPES, CARBONATE MINERALS, CHEMICAL ANALYSIS, DATA, EVEN-EVEN NUCLEI, HEAVY ION DECAY RADIOISOTOPES, HEAVY NUCLEI, INFORMATION, ISOTOPES, LEAD ISOTOPES, MINERALS, NUCLEI, NUMERICAL DATA, QUANTITATIVE CHEMICAL ANALYSIS, RADIOISOTOPES, RADIUM ISOTOPES, THORIUM ISOTOPES, VERTEBRATES, YEARS LIVING RADIOISOTOPES
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AbstractAbstract
[en] We have developed a resin phase spectrophotometric method to determine the amount of beryllium by detecting a change in absorbance of the resin phase. 8-Hydroxynaphthalene-3,6-disulphonic acid-(1-azo-2')-1',8'-dihydroxynaphthalene-3',6'-disulphonic acid tetrasodium salt (beryllon II) immobilized by a strong base anion-exchange resin on the end of a bifurcated optical fibre bundle was chosen as a material sensitive to beryllium. Experiments were made using a home-made optical fiber spectrophotometer. The properties of the resin phase proved to be good for continual use of 350 times during a month. The reaction order between immobilized beryllon II and beryllium in solution was determined by kinetic theory and experiments. This method was also used to determine the amount of beryllium in beryllium-copper alloy; the response was linear from 0.43 to 2.60 μg/ml at pH 12.5 and 676 nm. The effect of interfering ions on the determination of beryllium was studied at the same time. (Author)
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[en] The solvent extraction of lanthanum(III), europium(III), lutetium(III), scandium(III), and indium(III) in 0.1 mol dm-3 sodium nitrate solutions with 2-thenoyltrifluoroacetone (Htta) in the absence and presence of tetrabutylammonium ions (tba+) into carbon tetrachloride was measured. The extraction of lanthanum(III), europium(III), and lutetium(III) was greatly enhanced by the addition of tba+; this could be explained in terms of the extraction of a ternary complex, M(tta)4-tba+. However, the extractions of scandium(III) and indium(III) were nearly the same when tba+ was added. The data were treated on the basis of the formation equilibrium of the ternary complex from the neutral chelate, M(tta)3, with the extracted ion-pairs of the reagents, tta-tba+, in the organic phase. It was concluded that the degree of association of M(tta)3 with the ion-pair, tta-tba+, is greater in the order La(tta)3 ≅ Eu(tta)3 > Lu(tta)3, or that the stability of the ternary complex in the organic phase is higher in the order La(tta)4-tba+ ≅ Eu(tta)4-tba+ > Lu(tta)4-tba+. This is similar to those of adduct metal chelates of Htta with tributylphosphate (TBP) in synergistic extraction systems. (author)
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[en] Polycrystal compounds KTcO4 and RbTcO4 at 296 K were studied by 39K, 87Rb and 99Tc NMR pulsed method in the field of 7.04 Tl. 39K and 87Rb NMR spectra are characterized by quadrupole interaction of the second order, while 99Tc NMR spectra present a multiplet structure at the expense of quadrupole interations of the first order. From analysis of electric field gradient (EFG), shape of lines cluster, coordination compounds, EFG tensor asymmetry parameters, dipole broadening and isotropic values of chemical shift were determined. Dependence of EFG in anionic and cationic positions on reciprocal volume of the unit cell is linear. Lattice and valency contributions of 99Tc to EFG are evaluated
Original Title
Lokal'nye gradienty ehlektricheskikh polej v pertekhnetatakh po dannym YaMR
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[en] Investigations into chemical and phase compositions of solid-phase products of H3BO3-NaVO3-HNO3-H2O system depending on pH solution of sodium metavanadate and ratio of initial components in mixture of H3BO3 and NaVO3 solutions, are carried out. It is determined that complex of 7Na2O·B2O3·13V2O5·75H2O formula whose composition is stable and does not depend either on ratio of initial components in the system or on pH medium, is formed in the studied system. On the basis of data of X-ray phase, thermographic analysis technique, IR and NMR spectroscopy the separated complex is attached to Na7[B(OH)3V13O36·6H2O]·29,5H2O formula. Using IR spectra identification the given compound is atteched to heteropolycompound on the basis of Keggin structure
Original Title
Borovanadat natriya i ego fiziko-khimicheskie svojstva
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Journal Article
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ALKALI METAL COMPOUNDS, BARYONS, BORON COMPOUNDS, CATIONS, CHALCOGENIDES, CHARGED PARTICLES, CHEMICAL ANALYSIS, COHERENT SCATTERING, DIFFRACTION, ELEMENTARY PARTICLES, FERMIONS, GRAVIMETRIC ANALYSIS, HADRONS, HYDROGEN IONS, HYDROGEN IONS 1 PLUS, IONS, NUCLEONS, OXIDES, OXYGEN COMPOUNDS, QUANTITATIVE CHEMICAL ANALYSIS, SCATTERING, SODIUM COMPOUNDS, SPECTRA, SYNTHESIS, THERMAL ANALYSIS, TRANSITION ELEMENT COMPOUNDS, VANADIUM COMPOUNDS
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[en] Molybdenum (5) fluorohalides: MoF4Cl2, MoF4Cl, MoF4.75Br0.25, MoF4Br, MoF3Br2, MoF4.75I0.25 are synthesized. Composition of saturated vapour over MoF4.75Br0.25 is determined by high-temperature mass-spectrometry
Original Title
Sintez i fiziko-khimicheskie issledovaniya ftorgalogenidov molibdena (5)
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[en] A study was made on spectral-luminescent characteristics of zinc-borates with different structure, activated by Mn2+ ions, as well as on prospects of their practical use in gas-discharge indication panels (GIP). Spectral characteristics of zinc metaborate Zn4O(BO2)6 and zinc orthoborate Zn3(BO3)2 under VUV-excitation were investigated. The presented spectral-luminescent characteristics of zinc-borates, activated by Mn2 ions, testify to the promising character of their use in GIP
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Lyuminestsentnye svojstva aktivirovannykh margantsem tsinkoboratov s razlichnoj strukturoj
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[en] Investigation into ErNi interaction with hydrogen in the pressure region of < 1 MPa and at temperatures close to room ones is conducted using a differential automatic calorimeter. X -ray phase analysis of the reaction products allows one to consider that transformation of the source FeB structure in CrB takes place. Elementary cell parameters for ErNiH3.6 are determined: a=0.3655 (3), b=1.1200 (8), c=0.4590 (5) nm. Dependence of differential enthalpy of hydrogen dissolution in ErNiHx on x is studied. It is shown that in the region of 0 < x 1 < 1.0 and 1.0 < x < 3.0 compositions the differential dissolution enthalpies have constant values equalling respectively to -99.1 ± 0.7 and -90.6 ± 0.7 kJ/mol of H2ErNi hydration enthalpy up to ErNiH3,0 composition, equalling to -93 ± 1 kJ/mol of H2 is calculated by dissolution differential enthalpy integration
Original Title
Kalorimetricheskoe issledovanie vzaimodejstviya ErNi s vodorodom
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Journal Article
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Vestnik Moskovskogo Universiteta, Seriya 2. Khimiya; ISSN 0579-9384;
; CODEN VMUKA5; v. 33(6); p. 597-599

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AbstractAbstract
[en] The character of thermal transformations of chromium (3), manganese (2), iron (3), cobalt (2), nickel (2), copper (2), lanthanum (3), cerium (3) and praseodymium (3) formates was studied by thermogravimetric method. In the course of lanthanum formate thermal decomposition in the range of 360-400 deg C oxocarbonate is formed, which at higher temperatures decomposes slowly to oxide. The process of the formate dehydration affect thermal stability of the salts owing to local hydrolysis of metal cation. A correlation between the temperature, corresponding to the maximum decomposition rate of d-element formates and their decomposition heat, was established
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Termicheskoe razlozhenie formiatov nekotorykh d- i f-ehlementov; f-elements: La, Ce, Pr
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