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Published on: May 26, 2023
Features of sample preparation techniques in the total-reflection X-ray fluorescence analysis of tea leaves
Artem S Maltsev1, Elena V Chuparina2, Galina V Pashkova3
1Institute of the Earth's Crust, SB RAS, 128 Lermontov st., Irkutsk, Russian Federation; Kazan National Research Technological University, 68 K.Marx st., Kazan, Russian Federation.
Abstract:
Tea is a popular drink around the world and contains essential minerals and trace elements for human health. In this study, the analytical capabilities of the total-reflection X-ray fluorescence method (TXRF) were considered for the analysis of tea. Different sample preparation techniques, e.g. suspension, open vessel acid digestion, and microwave acid digestion were examined. The influence of particle size was investigated in the analysis of the suspension of tea samples. Mass-absorption coefficients for the tea matrix and the critical surface density of the specimen were calculated. The data obtained explain the presence of absorption effects in the determination of P, S, Cl, and K in suspensions. The digestion procedure is chosen as an optimal sample preparation technique for the TXRF analysis of tea. Nineteen real tea samples were analyzed using TXRF. The advantages of TXRF have been presented through the comparison of results with the wavelength-dispersive X-ray fluorescence spectrometry method.
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