The sorption study of La(Ⅲ) was carried out on poly[dibenzo-18-crown-6] and L-valine medium. The quantitative adsorption of La(Ⅲ) was found at 1×10-2 to 1×10-5 mol/L L-valine. The various eluting agents we...The sorption study of La(Ⅲ) was carried out on poly[dibenzo-18-crown-6] and L-valine medium. The quantitative adsorption of La(Ⅲ) was found at 1×10-2 to 1×10-5 mol/L L-valine. The various eluting agents were found efficient eluents for La(Ⅲ). The capacity of crown polymer for La(Ⅲ) was found to be 0.43 ±0.01 mmol/g. The tolerance limit of various cations and anions for La(Ⅲ) was determined. La(Ⅲ) was quantitatively separated from other metal ions in binary as well as multicomponent mixtures. The study was extended to sequential separation of La(Ⅲ), U(VI) and Th(IV). The good separation yields were obtained and had good reproducibility (±2%). The method incorporated the determination of La(Ⅲ) in real sample. The method was simple, rapid and selective.展开更多
The solubility of the ternary system Eu(NO2)3·3H2O-18C6-CH3CN at 30℃ has been studied by means of semimicro phase equilibrium. The results indicate that there is only one stoichiometric complex formed in the ter...The solubility of the ternary system Eu(NO2)3·3H2O-18C6-CH3CN at 30℃ has been studied by means of semimicro phase equilibrium. The results indicate that there is only one stoichiometric complex formed in the ternary system. There are two solubility curves for this ternary system. The long one corresponds to the solid phase of the complex Eu(NO3)3·18C6·3H2O and the short one to the solid phase of the 18C6. The curve of refractive indexes for the saturated solutions consists of two branch lines, which correspond to the solubility curves. The behavior of water for this system in equilibrium, has been examined. The mole ratio. H2O/Eu(NO3)3, whether in liquid phase or in solid phase, is always 3: 1. The complex formed in this solvent has been isolated. The composition of this complex has been examined by chemical analysis. The behavior of this complex has also been examined by IR spectra, thermalanalysis and molar conductance.展开更多
基金Project supported by the University Grants Commission,New Delhi
文摘The sorption study of La(Ⅲ) was carried out on poly[dibenzo-18-crown-6] and L-valine medium. The quantitative adsorption of La(Ⅲ) was found at 1×10-2 to 1×10-5 mol/L L-valine. The various eluting agents were found efficient eluents for La(Ⅲ). The capacity of crown polymer for La(Ⅲ) was found to be 0.43 ±0.01 mmol/g. The tolerance limit of various cations and anions for La(Ⅲ) was determined. La(Ⅲ) was quantitatively separated from other metal ions in binary as well as multicomponent mixtures. The study was extended to sequential separation of La(Ⅲ), U(VI) and Th(IV). The good separation yields were obtained and had good reproducibility (±2%). The method incorporated the determination of La(Ⅲ) in real sample. The method was simple, rapid and selective.
文摘The solubility of the ternary system Eu(NO2)3·3H2O-18C6-CH3CN at 30℃ has been studied by means of semimicro phase equilibrium. The results indicate that there is only one stoichiometric complex formed in the ternary system. There are two solubility curves for this ternary system. The long one corresponds to the solid phase of the complex Eu(NO3)3·18C6·3H2O and the short one to the solid phase of the 18C6. The curve of refractive indexes for the saturated solutions consists of two branch lines, which correspond to the solubility curves. The behavior of water for this system in equilibrium, has been examined. The mole ratio. H2O/Eu(NO3)3, whether in liquid phase or in solid phase, is always 3: 1. The complex formed in this solvent has been isolated. The composition of this complex has been examined by chemical analysis. The behavior of this complex has also been examined by IR spectra, thermalanalysis and molar conductance.
