欢迎访问《茶叶科学》,今天是

茶叶科学 ›› 2006, Vol. 26 ›› Issue (3): 204-208.doi: 10.13305/j.cnki.jts.2006.03.010

• • 上一篇    下一篇

氧弹燃烧-标准加入氟离子选择性电极法测定砖茶中的氟

汪显阳, 李鲁玲   

  1. 安徽医科大学化学教研室,安徽 合肥 230032
  • 收稿日期:2005-08-11 修回日期:2006-07-11 出版日期:2006-09-25 发布日期:2019-09-11
  • 作者简介:汪显阳(1964- ),男,安徽望江县人,副教授、硕士。主要从事医学化学教学和相关研究。
  • 基金资助:
    安徽省教育厅自然科学基金资助课题(No2003kj222); 安徽医科大学优秀中青年骨干教师基金资助课题

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:2006-09-25 Published:2019-09-11

摘要: 采用氧弹燃烧-标准加入氟离子选择性电极法研究了砖茶氟含量测定。结果表明:用充氧3βMPa的氧弹燃烧分解样品,去离子水吸收燃烧产物,吸收液加入含柠檬酸钠浓度为110.0βg/L、pH5.6的TISAB,然后用标准加入氟离子选择性电极法测定氟含量;回收率为95.88%~101.0%,相对标准偏差为0.75%~1.25%,测定国家茶叶标准物质氟含量与标示值相符。该法测定砖茶中氟含量简便、快速、准确。

关键词: 氧弹, 标准加入法, 氟离子选择性电极, 砖茶,

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

中图分类号: