Abstract
A method is shown for the determination of trace amounts of lithium by X-ray
fluorescence spectrometry (XRF) in natural mineral waters with various therapeutic
effects originating in Poland. The method is an expansion of X-ray fluorescence
spectrometry applications to the determination of a very light element. The direct
determination of lithium by XRF is practically impossible due to the extremely low
fluorescence yield and long-wavelength characteristic radiation of such a light
element. The lithium is determined via iron after precipitation with stoichiometric
potassium lithium periodatoferrate(III) complex. The solution obtained after
dissolving the complex was pipetted onto Mylar foil for XRF analysis. As little as 1
μg Li may be determined with this method. Accurate lithium determinations can be
obtained using simple calibration samples requiring only pipetting Fe solution in
the range 8.0–28.0 μg onto the Mylar foil. The prepared samples are thin, which
allows the errors resulting from self-absorption or matrix effects to be neglected.
Our studies give essential information about the quality of the analyzed
waters.
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