Spectrographic Determination of Trace Amounts of Rare Earths. III. Determination of All Rare Earth Elements by the Carrier Distillation Method

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Abstract
A carrier distillation method has been applied for quantitative determination of trace amounts of rare earths in hydrochloric acid solution evaporated on graphite matrix. The method can be applied to the analysis of all rare earth elements. The detection limit obtained for individual elements was from 0.02 to 0.16 μg per sample (except for Yb it was 0.0008 μg per sample). The deviations of the position of the analytical curves for the individual rare earth elements have been investigated as they are affected by addition of all other rare earth elements in concentrations at the upper limit of the procedure. It was established that the influence of additional elements is different for the various elements and for the different lines of the same element. The interpolation error for maximal difference in composition between the sample and spectrographic standards has been calculated.