Determination of Trace Elements Zinc and Selenium in Fenggang Zinc Selenium Tea

Abstract

Objective: To determine the contents of trace elements zinc and selenium in raw materials, semi-finished products and finished products of Fenggang zinc and selenium tea, and to analyze their differences, in order to control the quality of Fenggang zinc and selenium tea. Methods: Eigh-teen batches of Fenggang zinc-selenium tea samples in different processing stages were pre-treated by wet digestion and microwave digestion. The contents of zinc and selenium in Fenggang zinc-selenium tea samples during processing were determined by inductively coupled plasma mass spectrometry (ICP-MS), and their contents were analyzed by systematic difference analysis and systematic cluster analysis. Results: The contents of zinc and selenium in Fenggang Zinc and Selenium tea at different processing stages were all within the standard range, and there was no significant difference in the contents of zinc and selenium in Fenggang zinc and selenium tea at different processing stages (P > 0.05), which was consistent with the results of systematic cluster analysis. Conclusion: The study showed that the contents of zinc and selenium in Fenggang Zn-selenium tea had no significant difference in each processing process, indicating that the processing technology had little influence on the tea.