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81.
82.
83.
S. Vajda 《Reaction Kinetics and Catalysis Letters》1979,11(1):39-43
The question of the possibility to determine all the unknown parameters of kinetic models is considered. A simple algebraic condition for structural identifiability in first order reaction systems is given.
. .相似文献
84.
85.
Sz. Osváth N. Vajda Zs. Molnár 《Journal of Radioanalytical and Nuclear Chemistry》2009,281(3):461-465
A combined radiochemical separation method has been developed that enables the simultaneous determination of 234U, 235U, 238U, 237Np, 239,240Pu, 238Pu, 241Am, 242Cm, and 244Cm in medium and low level liquid radioactive wastes. The main steps of the method are sample destruction, co-precipitation
on iron(II)-hydroxide and calcium-oxalate, separation by extraction chromatography using supported dipentyl-pentyl phosphonate
(UTEVA) and supported N,N-octylphenyl-di-i-butylcarbamoylmethyl phosphine oxide with tributyl phosphate (TRU), and α source preparation. The key parameter
of the method is the adjustment of the oxidation states of the actinoides before adding the sample onto the UTEVA column.
It has been determined that (NH4)2S2O8 can be used for oxidation state adjustment resulting sufficient chemical yields. 相似文献
86.
The adsorption behavior of proline under hydrophilic interaction chromatography conditions was investigated from six aqueous solutions of acetonitrile. Proline adsorption isotherms were recorded at each mobile phase composition by frontal analysis and inverse method. The BET model was found to be the best choice to describe the nonlinear behavior of proline adsorption under hydrophilic interaction chromatography conditions. The adsorption isotherm parameters were derived from two independent parameter estimation methods. The parameters derived from regression analysis of the frontal analysis data and from overloaded elution bands were found to be in good agreement with the excess isotherm of water. The mobile phase composition at which the maximum excess adsorption of water was observed corresponded to the maximum saturation capacity measured for proline. 相似文献
87.
Adsorption of acetonitrile and methanol was measured on non-endcapped and endcapped octadecyl stationary phases. The results enabled us to characterize the effect of end-capping on the adsorption of the organic modifiers. Our results clearly demonstrate how the end-capping groups modify the chromatographic properties of adsorbents. Differences between solvent adsorption mechanisms are also discussed. Adsorption of acetonitrile is governed by hydrophobic effects whereas methanol is adsorbed by the organic ligand by a hydrophobic interaction and by the residual silanols by hydrogen-bond formation and dipole–dipole interactions. 相似文献
88.
89.
Sz. Osváth N. Vajda Zs. Molnár É. Széles Zs. Stefánka 《Journal of Radioanalytical and Nuclear Chemistry》2010,286(3):675-680
The majority of long-lived radionuclides produced in the nuclear fuel cycle can be regarded as “difficult-to-measure” nuclides,
hence chemical separation is needed before the nuclear measurement of them. A combined radiochemical procedure that enables
the simultaneous determination of some “difficult-to-measure” nuclides in medium and low level radioactive wastes has been
developed in our laboratory. Recently, this method has been extended for determination of 237Np and 93Zr. 237Np and 93Zr are pre-concentrated by co-precipitation on iron(II) hydroxide and zirconium oxide, separated by extraction chromatography
using UTEVA, and measured by inductively coupled plasma mass spectrometry (ICP-MS). As even traces of polyatomic ions and
isotopes at m/z 237 or 93 cause considerable interferences during ICP-MS detection, a purification step by extraction chromatography
was needed. Analyzing real samples (evaporation concentrates of a nuclear power plant) 66–99% and 31–99% chemical yields were
achieved for Np and Zr, respectively. 相似文献
90.
Nora Vajda Marta Balla Zsuzsa Molnar Denes Bodizs 《Accreditation and quality assurance》2006,10(11):599-602
The Radiochemical Laboratory participated in the Technical Co-operation (TC) Project on Quality Control and Quality Assurance for Nuclear Analytical Techniques RER/2/004 organized by the International Atomic Energy Agency (IAEA) during the period June 1999 and September 2001. Motivations, major goals of participation in the project, milestones of implementation of the project, establishing the quality system, improvements fulfilling both technical and management requirements as well as major achievements for future activities of the laboratory with respect to technical and financial conditions are discussed in detail. 相似文献