Abstract
A method of simultaneous determination of heavy and light lanthanides has been described. In the first stage, the total amount of rare earth elements is determined (complexometrically with EDTA as a titrant and MTB as an indicator, pH = 5.5). Then, on the basis of the proportional relationship between absorbance and molar ratio of the system, concentration of each component is calculated (using the measured absorbance of the system and “the absorbance of the standard” taken from the standard calibration curves). The applicability of the method is limited by r.e.e. concentration equal to 3 × 10 −5 M. In the case when the content of one of the metals amounts to at least 15% of their sum, the relative error of determination does not exceed 2%. Results of the determination for selected pairs of lanthanides are presented together with a statistical estimation of errors.
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