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K. V. Oskolok, O. V. Monogarova, N. V. Alov
Total-reflection X-ray fluorescence
determination of rare earth elements in mineral water
Abstract
The approach for the determination of a
lanthanum, cerium, praseodymium, neodymium and samarium in mineral water by
total-reflection X-ray fluorescence analysis is proposed. In this work the
combined technique of preliminary concentration of rare earth elements is used.
This procedure includes two stages – co-precipitation of metal hydroxides on a
collector – iron(III) hydroxide – and dispersive liquid-liquid microextraction
of their complex compounds with 1-(2-pyridylazo)-2-naphthol by chloroform in
the presence of ethanol. By means of the developed hybrid approach perhaps the
simultaneous determination of the specified metals in mineral water in range n.(10–2–101)
g.l–1. Results of the
analysis of natural waters "Arkhyz" and "Rychal-Su" by the extraction and
total-reflection X-ray fluorescence way offered in work are confirmed by the
literary data obtained by inductively coupled plasma mass spectrometry.
Key words: total-reflection X-ray
fluorescence analysis, dispersive liquid-liquid microextraction,rare earth elements,
mineral water.
Copyright (C) Chemistry Dept., Moscow State University, 2002
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