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3MPa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110．0g／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。
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 3 MPa 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 110.0 g / 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.
出处
《茶叶科学》
CAS
CSCD
北大核心
2006年第3期204-208,共5页
Journal of Tea Science
基金
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
关键词
氧弹
标准加入法
氟离子选择性电极
砖茶
氟
oxygen bomb, standard addition method, fluoride ion selective electrode, brick-tea, fluoride
