【作者】 蔡荟梅； 宛晓春； 侯如燕；

【Author】 CAI Hui-mei,WAN Xiao-chun,HOU Ru-yan (Anhui Agricultural University,Key Laboratory of Tea Biochemistry & Biotechnology, Ministry of Education& Agriculture,Hefei 230036,China)

【机构】 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；

【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3MPa的氧弹燃烧分解样品,去离子水吸收燃烧产物,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5-40mmol/L,流速为1.0ml/min。氟离子的线性范围为0.05～30mg/L,氟的检出限为5μg/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。更多还原

【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 3MPa purity oxygen, then absorbing the ash with deionization water, the content of total fluoride was determined directly by means of ion chromatography. The gradient elution procedure was optimized as 5-40mmol/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 5μg/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.Conclusion:Its advantages are simple operation, high sensitivity and good repeatability.更多还原