Keywords: 
• 硫酸铵 /
• 电沉积 /
• 铀 /
• 红外 /
• 扫描电镜

Abstract: Characteristics of electrodeposited uranium films of uranium ore water sample in ammonium sulphate was investigated in this work.The optimized electrodeposited conditions were as follows:electro-lyte was ammonium sulphate of 0.8 M,and current density at the cathode was 0.6 A/cm~2,electrolyte pH value was 2.5,the time of plating on the electrodeposition was 1 h.In this situation,the uniform,thin and adheresive films were produced by electrodeposition method.Two samples were made,one electro-deposition of pure uranyl nitrate,and another electrodeposition of uranium ore water sample after chemical separation.Characteristics of electrodeDosited uranium films of uranium ore water sample after、chemical separation was studied,making comparisons with electrodeposited films of uranyl nitrate.The analysis of film characteristics was done through infrared(IR)spectrum,scanning electron microscopy(SEM),ele-ment analysis and a spectrum measurment.According to Fourier transform infrared spectra,the asym-metric stretching vibration band of uranyl group is around 887 cm~(-1).In addition,according to IR spec-trum,we know that uranium exists mainly as the form of hydrated polymeric compound in the film.Elec-trodeposited uranium films also included many NH_4~+.Polymeric structures of variable composition were present in the eIectrodeposited samples,with the unit monomeric formula UO_2(OH)_2·xNH_3·yH_2O or UO_2(OH)_(2-x)·(ONH_4)_x·yH_2O.Scanning electron microscopy shows that the two samples have similar surface characteristics and no cluster is observed.The samples were also measured by spectrometer equipped with Passivated Implanted Planar Silicon(PIPS)detector.From the a spectrum,we know that isotoDes of uranium in the film are ~(238)U and ~(234)U.~(235)U is not found in the α spectrum.It also shows that the chemical separation process can isolate uranium from other interfering elements effectively,the result of chemical separation is very satisfactory and electrodeposited process is rather efficient.Source electrode-posited in ammonium sulphate through optimized conditions satisfies the need of high-resolution α spec-trum.