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Journal of Tea Science ›› 2009, Vol. 29 ›› Issue (3): 225-230.doi: 10.13305/j.cnki.jts.2009.3.008

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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 Published:2019-09-06

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

CLC Number: