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[Use of chelating extraction membranes for the identification and determination of heavy metals using radionuclide X-ray fluorescence analysis].

The paper aimed to identify and assay the selected elements Mn, Fe, Cu, Zn, and Pb in the teas Agrimony (both in infusion bags and loose leaves), Pigi Tea, and Green Tea with added jasmine, both in the original raw teas and their infusions. The utility and usability of the chelating extraction membranes Empore, which were employed to process the liquid samples (infusions), were verified. The evaluation of the composition of the content was carried out by means of radionuclide X-ray fluorescence analysis, which is suitable for the identification and determination of samples with Z>18. Ash content was assayed as well. The contents of the heavy metals under study did not exceed the limits required by the standard.