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Boron and strontium isotope ratios and major/trace elements concentrations in tea leaves at four major tea growing gardens in Taiwan

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Abstract

Isotopic compositions of B and Sr in rocks and sediments can be used as tracers for plant provincial sources. This study aims to test whether tea leaf origin can be discriminated using 10B/11B and Sr isotopic composition data, along with concentrations of major/trace elements, in tea specimens collected from major plantation gardens in Taiwan. The tea leaves were digested by microwave and analyzed by multi-collector inductively coupled plasma mass spectrometry (MC-ICPMS). The data showed significant variations in 87Sr/86Sr ratios (from 0.70482 to 0.71462), which reflect changes in soil, groundwater or irrigation conditions. The most radiogenic tea leaves were found at the Taitung garden and the least radiogenic ones were from the Hualien garden. The δ 11B was found to change appreciably (δ 11B = 0.38–23.73 ‰) which could be due to fertilizers. The maximum δ 11B was also observed in tea samples from the Hualien garden. Principal component analysis combining 87Sr/86Sr, δ 11B and major/trace elements results successfully discriminated different sources of major tea gardens in Taiwan, except the Hualien gardens, and this may be due to rather complicated local geological settings.

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Acknowledgments

We thank Drs. Y.J. Tu for analytical assistance on ICP-OES and J.C. Wu (Director of TRES) for sharing tea leaf specimens. This study was financial supported by MOST and MOE, Taiwan, to Y.C.F.

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  1. Hung-Chun Chao

    Present address: Department of Earth and Environmental Sciences, National Chung Cheng University, Chiayi, Taiwan, ROC

Authors and Affiliations

  1. Department of Earth Sciences, National Cheng Kung University, Tainan, 701, Taiwan, ROC

    Cheng-Ta Chang & Chen-Feng You

  2. Earth Dynamic System Research Center, National Cheng Kung University, Tainan, 701, Taiwan, ROC

    Chen-Feng You, Chuan-Hsiung Chung & Hou-Chun Liu

  3. Department of Chemistry, Homi Bhabha National Institute (HBNI), Anushakti Nagar, Mumbai, 400 094, India

    Suresh Kumar Aggarwal

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  1. Cheng-Ta Chang
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Correspondence to Chen-Feng You.

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Chang, CT., You, CF., Aggarwal, S.K. et al. Boron and strontium isotope ratios and major/trace elements concentrations in tea leaves at four major tea growing gardens in Taiwan. Environ Geochem Health 38, 737–748 (2016). https://doi.org/10.1007/s10653-015-9757-1

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