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茶叶科学 ›› 2009, Vol. 29 ›› Issue (3): 225-230.doi: 10.13305/j.cnki.jts.2009.3.008

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氧弹燃烧-离子色谱法测定茶叶中氟的含量

蔡荟梅, 侯如燕, 郜红建, 宛晓春*   

  1. 安徽农业大学教育部农业部茶叶生物化学与生物技术重点实验室,安徽 合肥230036
  • 收稿日期:2008-10-22 修回日期:2009-01-08 出版日期:2009-06-15 发布日期:2019-09-06
  • 通讯作者: *
  • 作者简介:蔡荟梅(1972— ),女,安徽庐江人,副教授,主要从事茶叶质量安全研究。Hml20@sina.com.
  • 基金资助:
    国家科技支撑计划(2006BAK02A00),张一元科技创新基金

Determination of Fluoride in Tea with Oxygen Bomb Combustion and Ion Chromatography Method

CAI Hui-mei, HOU Ru-yan, GAO Hong-jian, WAN Xiao-chun*   

  1. Anhui Agricultural University, Key Laboratory of Tea Biochemistry & Biotechnology,Ministry of Education& ministry of Agriculture,Hefei 230036, China
  • Received:2008-10-22 Revised:2009-01-08 Online:2009-06-15 Published:2019-09-06

摘要: 采用氧弹燃烧-离子色谱方法研究茶叶中氟离子的测定。结果表明:用充氧3 MPa的氧弹燃烧分解样品,然后用离子色谱法测定茶叶中氟离子的含量,建立了KOH梯度淋洗程序为5~40 mmol/L,流速为1.0 mL/min。氟离子的线性范围为0.05~30 mg/L,茶叶中氟的检出限为5 µg/kg;平均回收率为90.7%~103.4%,相对标准偏差为0.93%~2.02%;测定国家茶叶标准物质氟含量与标准值相符。结论本方法具有操作简便,检测干扰小,结果准确可靠的优点。

关键词: 茶叶, 氟离子, 氧弹燃烧, 离子色谱法

Abstract: The method of determining total fluoride in tea has been investigated, with oxygen bomb combustion and ion chromatography. The result showed that the sample of tea was burned in the oxygen bomb with 3 MPa purity oxygen, the content of total fluoride was determined directly by means of ion chromatography. The gradient elution procedure was optimized as 5~40 mmol/L and the flow rate as 1.0 mL/min. The linear range of the calibration curve for fluoride was 0.05~30 mg/L with a detection limit of 5 μg/kg. The average recoveries were 90.7%~103.4% with RSD of 0.93%~2.02%. The fluoride in national tea reference material was determined.It was concluded that the advantages of present method are simple operation, high sensitivity and good repeatability.

Key words: tea, fluorid, oxygen bomb combustion, ion chromatography

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