X-Ray Fluorescence Determination of Trace Elements in Vitamin-Mineral Complexes and Medicinal Herbs Using Chemically Modified Polyurethane Foam Sorbents

[摘要] In this paper, we proposed the method of X-ray fluorescence (XRF) for the determination of some essential trace elements in medicinal herbs and vitamin-mineral complexes at the level of 1-10 g/ml. To increase sensitivity and selectivity of the determination, we followed simple and effective approach based on the extraction of metal ions from aqueous solutions with chemically modified polyurethane foam sorbents followed by direct XRF analysis. The conditions of sorption preconcentration of Co (II), Ni (II) and Zn(II) ions with modified sorbents were optimized. The proposed approach is used for the determination of trace elements in several kinds of medicinal herbs (coltsfoot leaves, nettle leaves and yarrow herb) and vitaminmineral complexes (Alfavit, Vitrum and Multi-tabs).

[学科分类] 计算机网络和通讯

[关键词] Trace elements;Medicinal herbs;Vitamin-mineral complexes;Polyurethane foam sorbent;X-ray fluorescence analysis.