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Journal of Tea Science ›› 2006, Vol. 26 ›› Issue (3): 204-208.doi: 10.13305/j.cnki.jts.2006.03.010

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Determination of Total Fluoride in Brick Tea with Oxygen Bomb Combustion-Standard and Fluoride Ion Additive Selective Electrode Method

WANG Xian-yang, LI Lu-ling   

  1. Department of Chemistry, Anhui Medical University, Hefei 230032, China
  • Received:2005-08-11 Revised:2006-07-11 Online:2006-07-15 Published:2019-09-11

Abstract: The method of determining total fluoride in brick-tea has been investigated, with oxygen bomb combustion-standard and fluoride ion additive selective electrode. The result showed that the sample of brick-tea was burned in the oxygen bomb with 3βMPa purity oxygen, then absorbing the ash with deionization water, the content of total fluoride was determined directly by means of fluoride ion additive selective electrode under pH5.6 and the concentration of sodium citrate dihydrate in TISAB is 110.0βg/L. The average recoveries were 95.88%~101.0% with RSD of 0.75%~1.25%. The fluoride in national tea reference material was determined, and the content of fluoride was accord with the certified values. This method is simple, rapid, accurate.

Key words: oxygen bomb, standard addition method, fluoride ion selective electrode, brick-tea, fluoride

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