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Assessment and Prospects of Fluoride Reduction Measures in Brick Tea Production
YINChunyan, ZHANGLi, YUTingting, JIANGYing, LIUJie, ZHANGJu
Journal of Agriculture ›› 2025, Vol. 15 ›› Issue (6) : 77-84.
PDF(1656 KB)
PDF(1656 KB)
Assessment and Prospects of Fluoride Reduction Measures in Brick Tea Production
This paper aims to summarize and scientifically evaluate the effectiveness of existing fluoride reduction measures, providing validation and reference for further research on fluoride reduction strategies. This paper employed a combination of literature analysis, field investigations, and experimental validation to systematically assess the feasibility and effectiveness of various fluoride reduction measures at different stages, including tea tree cultivation, tea leaf harvesting, raw tea production, brick tea production, and tea consumption. Through systematic analysis and experimental validation, it was found that selecting low-fluoride tea tree varieties during cultivation and controlling the harvest time during tea leaf collection effectively reduced the fluoride content at the source. The water washing process during brick tea production was able to lower the fluoride content in the tea leaves to some extent. Additionally, adopting scientifically recommended tea-drinking practices reduced the fluoride intake from brick tea. Calcium phosphate and hydroxyapatite were identified as safe and effective fluoride adsorption materials. However, fluoride reduction effects were not significant when improving tea garden environments, using water blanching techniques, or adding fluoride-reducing materials during the pile fermentation process. Research on fluoride reduction measures in brick tea needs to further enhance the scientific evaluation process, improve the feasibility of practical applications, and fully consider the impact of these measures on the quality and safety of brick tea.
brick tea / fluoride reduction measures / analysis and validation / future prospects
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Brick tea usually contains very high fluoride, which may affect human health. Biosorbents have received much attention for selective removal of fluoride because of low cost, environmental friendliness, and relative safeness.In the present study, a highly selective fluoride tea waste based biosorbent, namely, aluminum (Al) oxide decorated tea waste (Tea-Al), was successfully prepared. The Tea-Al biosorbent was characterized by energy-dispersive spectrometry, Fourier transform infrared spectroscopy, powder X-ray diffraction and X-ray photoelectron spectroscopic analysis. The Tea-Al sample exhibited remarkably selective adsorption for fluoride (52.90%), but a weaker adsorption for other major constituents of brick tea infusion, such as catechins, polyphenols and caffeine, under the same conditions. Fluoride adsorption by Tea-Al for different times obeyed the surface reaction and adsorption isotherms fit the Freundlich model. In addition, the fluoride adsorption mechanism appeared to be an ion exchange between hydroxyl and fluoride ions.Results from this study demonstrated that Tea-Al is a promising biosorbent useful for the removal of fluoride in brick tea infusion. © 2016 Society of Chemical Industry.© 2016 Society of Chemical Industry.
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