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Influences of charcoal and bamboo charcoal amendment on soil-fluoride fractions and bioaccumulation of fluoride in tea plants

Environmental Geochemistry and Health volume 34, pages 551–562 (2012)Cite this article

Abstract

High levels of fluoride in tea plants pose a potential health risk to humans who drink tea. It has been demonstrated that tea plant fluoride is closely related to the available fluoride in soil. But approaches that could be used to regulate the availability of fluoride in soil have been rarely seen. This study aims to investigate how the addition of charcoal and bamboo charcoal affected soil fluoride availability and bioaccumulation of fluoride in tea plants. In a microcosm experiment, tea plants were grown in the tea garden soil mixed with different amounts of charcoal and bamboo charcoal [that is, 0.5, 1.0, 2.5, and 5.0 % (w/w)]. Soil-fluoride fractions and fluoride accumulated in tea plants were determined using the sequential extraction and ion selective electrode method. Obtained results showed that both charcoal and bamboo charcoal additions significantly enhanced the concentrations of Fe/Mn oxide-bound fluoride, but significantly reduced the concentrations of water-soluble and exchangeable fluoride (p < 0.05) in soil. Charcoal and bamboo charcoal additions also significantly decreased the amounts of fluoride in tea roots and tea leaves (p < 0.05). However, the additions of charcoal and bamboo charcoal had no impacts on the tea quality, as indexed by the concentrations of polysaccharides, polyphenols, amino acids, and caffeine in tea leaves. These results suggested that application of charcoal and bamboo charcoal may provide a useful method to reduce the availability of fluoride in soil and the subsequent fluoride uptake by tea plants.

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Acknowledgments

This work was supported by National Natural Science Foundation of China (41071158), Open Fund of State Key Lab of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences (0812000037); the Key Project of Chinese Ministry of Education (210097). We are grateful to anonymous reviewers who give his/her invaluable comments and suggestions for improving this manuscript. We would also like to thank Christian Binz for proofreading this article.

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  1. Key Laboratory of Tea Biochemistry and Biotechnology, Ministry of Education, Anhui Agricultural University, Hefei, 230036, China

    Hongjian Gao, Zhengzhu Zhang & Xiaochun Wan

  2. State Key Lab of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China

    Hongjian Gao

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  1. Hongjian Gao
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  2. Zhengzhu Zhang
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Correspondence to Xiaochun Wan.

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Gao, H., Zhang, Z. & Wan, X. Influences of charcoal and bamboo charcoal amendment on soil-fluoride fractions and bioaccumulation of fluoride in tea plants. Environ Geochem Health 34, 551–562 (2012). https://doi.org/10.1007/s10653-012-9459-x

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  • DOI: https://doi.org/10.1007/s10653-012-9459-x

Keywords

  • Charcoal
  • Bamboo charcoal
  • Soil-fluoride fractions
  • Tea plants
  • Bioaccumulation
  • Translocation