Authors:Shen Rongsen, Wang Renzhi, Xing Ruiyun, Li Yingoi, Zhou Fengqi, Jiang Shaohua, Lin Zhihao and Xu Banglei
Three types of magnetic microparticle antibodies were developed: 1) magnetic second antibody I (MSA-I) where the antibody molecules were directly immobilized by physical adsorption on Fe3O4 microparticles (magnetic nucleus, MN) 10nm±34% in diameter, 2) magnetic second antibody II (MSA-II) where the antibody molecules were immobilized by chemical coupling on the MN coated with polyacrolein, and 3) magnetic, first antibody (MFA-T3) where the anti-T3 antibody molecules were specifically immobilized by immunoadsorption to the second antibody molecules of the MSA-II. The optimal conditions for their preparation were elaborated. Some physical, chemical and immunological characteristics of these magnetic microparticles were described. The application of the MSA-I, MSA-II and MFA-T3 to RIAs for evaluation of thyroid function, such as triiodothyronine (T3), reverse T3(rT3), free T3 (fT3), thyroxine (T4), free T4(fT4), thyroid-stimulating hormone (TSH), thyroglobulin (TG) and TG-antibody (TG-Ab), etc., was reported.
The sorption of radiocadmium on Ca-montmorillonite as a function of contact time, pH, ionic strength, foreign ions, humic
acid (HA) and fulvic acid (FA) was studied using batch technique. The results demonstrated that the sorption of Cd(II) was
dependent on ionic strength at pH < 9, and was independent of ionic strength at pH > 9. Outer-sphere surface complexation
and/or ion exchange were the main mechanism of Cd(II) sorption on Ca-montmorillonite at low pH, whereas the sorption at high
pH was mainly dominated via inner-sphere surface complexation. The sorption of Cd(II) on Ca-montmorillonite was dependent
on foreign ions at low pH values, but was independent of foreign ions at high pH values. A positive effect of HA/FA on Cd(II)
sorption was found at low pH values, whereas a negative effect was observed at high pH values. The thermodynamic parameters
(i.e., ΔH0, ΔS0, ΔG0) were calculated from the temperature dependent sorption isotherms, and the results indicated that the sorption process of
Cd(II) on Ca-montmorillonite was spontaneous and endothermic.
Authors:Li-jun Xu, Hong-sheng Ye, Ke-sheng Chen, Min Lin and Yun-dong Chen
A rapid separation system based on SISAK technique was established to isolate 142La successfully from fission products. SISAK technique is often applied in the separation of nuclides with the half-life of
seconds or minutes. Here it was used to separate the parent nuclide of 142La, which the half-life is in the magnitude of several seconds. According to the separation procedure designed in the paper,
the activity of 142La acquired is more than 104 Bq and the decontamination factors for most γ-emitters are higher than 103.
Authors:Z. Chen, S. Wang, J. Tang, X. Li, C. Liu, X. Xu and G. Cao
To provide a convenient and facile method to evaluate the radiochemical purity (RCP) of 99mTc-TRODAT-1 in quality control of routine clinical application, a simplified method of single-strip thin layer chromatography
(TLC) was developed and validated by high performance liquid chromatography (HPLC). The RCP data of TLC correlated well with
Authors:Longshan Zhao, Qing Li, Yan Cui, Jie Wang, Shanshan Xu, Xiaohui Chen and Kaishun Bi
The thermal decomposition of a new antibiotic agent, cefuroxime lysine, was investigated by thermogravimetry analysis/derivative thermogravimetry and differential scanning calorimetry (DSC) methods in anoxic and oxidative environments. The influence of heating rates (including 5, 10, 15, and 20 °C/min) on the thermal behavior of cefuroxime lysine was revealed. By the methods of Kissinger and Flynn–Wall–Ozawa, the thermal kinetic parameters of activation energy and pre-exponential factor for the exothermic processes under non-isothermal conditions were calculated using the analysis of corresponding DSC curves.
Authors:Y. Xu-Wu, Z. Hang-Guo, S. Wu-Juan, W. Xiao-Yan and G. Sheng-Li
The copper(II) complex of 6-benzylaminopurine (6-BAP) has been prepared with dihydrated cupric chloride and 6-benzylaminopurine.
Infrared spectrum and thermal stabilities of the solid complex have been discussed. The constant-volume combustion energy,
ΔcU, has been determined as −12566.92±6.44 kJ mol−1 by a precise rotating-bomb calorimeter at 298.15 K. From the results and other auxiliary quantities, the standard molar enthalpy
of combustion, ΔcHmθ, and the standard molar of formation of the complex, ΔfHmθ, were calculated as −12558.24±6.44 and −842.50±6.47 kJ mol−1, respectively.
Authors:N. He, D. Li, M. Tu, J. Shen, S. Bao and Q. Xu
The acidity of mesoporous materials FeSiMCM-41, LaSiMCM-41, SiMCM-41, AlSiMCM-41 and HAlSiMCM-41 has been investigated by microcalorimetric studies of the adsorption of ammonia and temperature programmed ammonia desorption method. In the initial stage, the acid strength sequence is SiMCM-41>HAlSiMCM-41>AlSiMCM-41>FeSiMCM-41>LaSiMCM-41, in agreement with that found for microporous molecular sieves materials. A small number of strong acid sites of SiMCM-41 may result from the aluminum impurity contained in the silica source material. The acid density sequence is HAlSiMCM-41>AlSiMCM-41>FeSiMCM-41>LaSiMCM-41SiMCM-41 and can be explained by the studies of existing states of trivalent atoms in these samples reported in previous work. Since some NH3-TPD plots of these samples show the profiles that could not be back to baseline at elevated temperature, the technique of microcalorimetric adsorption is preferable in studying these samples.
Authors:Guangsong Sun, Hui Xu, Huaming Li, Huoming Shu, Chengtang Liu and Qi Zhang
Gd2O3/Ag3VO4 photocatalysts are synthesized through the impregnation method and characterized by powder X-ray diffraction (XRD), X-ray
photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and UV–vis diffuse reflectance spectra (DRS). It is shown
that Gd3+ is dispersed on the surface of Ag3VO4 in the form of Gd2O3. The DRS analysis indicates that the ability of visible-light absorption of Gd2O3/Ag3VO4 catalysts is enhanced greatly. The photocatalytic activities of the samples are evaluated by degradation of Rhodamine B dye
under UV and visible-light irradiation, respectively. The experimental results show that the role of Gd2O3 content has a significant impact on the photocatalytic activities of the samples. The mechanism of enhanced photocatalytic
activity after the Gd introduction is discussed.
Authors:Xiao Yonghou, Yan Weifan, Yuan Shuanggui, Xu Yanbing, He Janjun, Pan Wiangyan and Li Yingjun
230Ra and its daughter 230Ac were produced by the reaction of 60 MeV/u 18O with ThO2. Using 133Ba, 224Ra and 212Pb–212Bi as tracers, 0.1M NH4EDTA–0.3M NH4-acetate solution as eluent, the relationship between pH and elution peaks, and the influence of the amount of Ba2+ carrier on the elution curve in cation exchange procedures were tested. Based on the results of conditional experiments, a procedure suitable for isolation of radium from the ThO2 irradiated with 60 MeV/u 18O beam was developed. The results demonstrated that the decontamination effectiveness for main reaction products, specially for barium, was satisfactory.
Authors:Xu Yanbing, Yang Weifan, Yuan Shuanggui, Xiao Yonghou, Pan Qiangyan and Li Yingjun
Barium isotopes were produced by 60 MeV/u 18O ion bombardment of natural uranium via 238U (18O, X) reactions. Ba sources were prepared by radiochemical separation, and measured by a HPGe detector. The cumulative cross sections were obtained by analysis of measured time sequence g-ray spectra. A double peak phenomenon in Ba isotope distribution was observed.