Institute of Chemistry, University of Silesia, ul. Szkolna 9, 40-006 Katowice, Poland.
Appl Spectrosc. 2011 Oct;65(10):1218-21. doi: 10.1366/11-06306.
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.
一种利用 X 射线荧光光谱法（XRF）测定具有各种治疗作用的波兰天然矿泉水中痕量锂的方法。该方法扩展了 X 射线荧光光谱法在测定非常轻元素方面的应用。由于如此轻的元素的荧光产率极低和长波长特征辐射，直接通过 XRF 测定锂实际上是不可能的。通过与化学计量的钾锂过碘酸铁(III)配合物沉淀来测定铁中的锂。溶解配合物后获得的溶液被吸取到聚酯薄膜上进行 XRF 分析。该方法可以检测低至 1μg 的锂。通过使用仅需将 8.0-28.0μg 的 Fe 溶液吸取到聚酯薄膜上的简单校准样品，可以获得准确的锂测定结果。制备的样品很薄，可以忽略由于自吸收或基体效应引起的误差。我们的研究提供了有关分析水样质量的重要信息。
