[en] In this experiment, the deposition behavior of "2"3"8U on 2μm Al foils was investigated, and the optimum conditions of the electrodeposition were determined. The electrodeposition yield was investigated by spectrophotometry. Arsenazo Ⅲ was taken as chromogenic reagent, the color of both targets were yellow, the films were adhered strongly to the baking material. (authors)

[en] In this paper, the primary mechanism of uranium biosorption by Rhodotorula glutinis was studied using SEM and FTIR. Obvious changes were observed in the biomass SEM picture before and after uranium adsorption, and the peak of UO_2 at wave number of 904 cm"-"1 was detected by FTIR, indicated that uranium was really absorbed to Rhodotorula glutinis. (authors)

[en] In order to study the extraction pattern of protactinium in different types of extracting agents and compare the similarity of pattern of extraction with dubnium and thereby unraveling its chemistry, in this work, solvent extraction of protactinium (V) with Aliquat336, MIBC, MIBK, DIPK, PMBP, TBP was studied using "2"3"3Pa as a radiotracer. The LogD values of Pa were determined as a function of the extractant concentrations using the six extractants. (authors)

[en] In this paper, extraction of "1"0"1Mo from HCl with α-benzoinoxime was studied. The goal of the research was to determine whether this extractant adapt to extract transactinide element Sg. (authors)

[en] Study on the chemical properties of Super Heavy Elements (SHE) is one of the most important research aspects in nuclear chemistry. In order to study the chemical properties of SHE ( Rf and Db), we can use the heavy ion beam of ²²Ne to bombard the thick targets of Sm and Eu to prepare the isotopes of Hf and Ta and then do model experiments. Therefore, preparation of uniform, stable and thick targets of Sm and Eu is the key for the research In this paper, the preparation process of thick targets of Sm and Eu from the isopropyl alcohol and nitric acid system was studied by using one cycle molecular plating method. Under the conditions that the current density was 3.8 mA/cm², the distance between the two poles was 3 cm and the deposition lasted 1 h, the best results that the deposition yield was above 95% and the thickness of Sm and Eu targets was 1.6 and 1.5 mg/cm² respectively which were determined by spectrophotometry were obtained. (authors)

[en] The present status of the chemical properties investigation for superheavy elements was described in this paper. The synthesis of superheavy elements and the experimental techniques used in studies on the gas phase chemistry of superheavy elements were briefly introduced. The current experimental studies about the gas-chromatography of Rf, Db, Sg, Bh, Hs and element 112 were discussed in detail. Finally, the development of synthesis of superheavy elements and the study on gas phase chemical properties of superheavy elements in China were prospected. (authors)

[en] Preparation of La, Sm, Eu, Gd, Tb and ²³⁸U targets from the mixture of isopropanol and nitric acid solution are studied by using single-cycle molecular plating technique. To determine the optimum conditions for the deposition process, the effect of current density, deposition time and distance between the two electrodes on the quality and electrodeposition yield of the target films are investigated individually. Depending on the deposited metal, the current densities are found to be 2 - 8 mA/cm² and the suitable distance between the two electrodes is 3 cm. With the spectrophotometry method, the electrodeposition yields for all the targets prepared are found to be higher than 85% after one hour's deposition. The composition and morphological structure of some targets are characterized by scanning electron microscope (SEM) and it can be seen that the surface of the targets are uniform and intact. Short-lived isotopes of Ta and W were produced from natural Gd and Tb targets bombarded by ¹⁹F beam at the SFC low energy radiochemical terminal of Institute of Modern Physics, Chinese Academy of Sciences, respectively, and successfully applied in the model experiment of Db (Z = 105) and Sg (Z = 106). (authors)

[en] Preparation of ²³⁸U on 2 μm Al foils by molecular plating technique is described. In order to obtain optimum conditions for deposition, several parameters influencing the quality of layers such as current density, distance between the anode and cathode and the deposition time were investigated. The target thickness was determined by spectrophotometry. The uniformity and morphology of the target surface were studied by means of scanning electron microscopy, energy dispersive X-ray spectrometry and Infrared spectra. The results show that uranium is deposited in its oxide or hydroxide form uniformly and adherently onto the foil.

[en] Solvent extraction of strontium with dicyclohexyl-18-crown-6 (DCH18C6) from HNO₃ solutions has been investigated. The effect of extraction conditions, such as organic diluents, the concentration of nitric acid, shaking time and temperature was studied. The extraction efficiency of Sr depends on the concentration of HNO₃ and the maximal extraction efficiency (about 92%) of Sr is obtained at 1 mol/L HNO₃. The back extraction efficiency is about (99.56± 1.7)% using H₂O as stripping agent. In kinetics studies, the extraction equilibration can be achieved at 10 min for Sr. The negative values of ΔH indicate the exothermic process for extraction of Sr. The selectivity studies show that DCH18C6 is an efficient extractant for strontium ions. (authors)

[en] ¹⁸O₂ gas is prepared from the electrolysis of heavy oxygen heavy water using a set of self-made quartz glass electrolysis system. Under the condition of raw material heavy oxygen heavy water ¹⁸O molar content is higher than 80%, the ¹⁸O₂ content of the prepared oxygen gas is determined to be 63.66%, which indicates that the whole electrolysis system is tight. In addition, the requirement of delivering ¹⁸O₂ beams from the electron cyclotron resonance ion source can be satisfied by the obtained ¹⁸O₂ gas. (authors)