Abstract
The elements La, Y, Pr, Nd, Sm and Ce form with MgII and purpurin (1,2,4-trihydroxyanthraquinone) mixed-metal complexes which can be extracted into isobutyl methyl ketone at pH 7.5. The total content of these metals can be determined by measuring the magnesium absorbance by AAS. The proposed method, which permits the determination of concentrations at ppb levels, was applied to the analysis of synthetic samples with good results.
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