离子色谱法测定茶叶中的游离氟

全文下载： 202105002.pdf

文章编号： 1672-6987（2021）05-0014-05； DOI： 10.16351/j.1672-6987.2021.05.002

尹秀贞1,2， 牛淑妍1*， 张涛2， 李莎3， 崔鹤2*(1.青岛科技大学 化学与分子工程学院，山东 青岛 266042;2.青岛海关技术中心，山东 青岛 266002;

3.中国海洋大学 化学化工学院，山东 青岛 266100)

摘要： 建立了一种简便、准确测定茶叶中游离氟含量的方法。样品经浸泡超声提取后，采用离子色谱法测定。结果表明：氟离子的质量浓度在0020~1000 mg·L-1范围内线性关系良好，检出限为20 mg·kg-1，在低、中、高3个加标水平下的平均回收率为9094%~9773%，相对标准偏差(RSD)为082%~306%（n=7）。经过测定，茶叶中游离氟含量在1888~15737 mg·kg-1，相对标准偏差为111%~401%（n=7），该方法可用于茶叶中游离氟含量的快速检测。

关键词： 茶叶； 游离氟； 超声萃取； 离子色谱

中图分类号： O 657.32文献标志码： A

引用格式： 尹秀贞， 牛淑妍， 张涛， 等. 离子色谱法测定茶叶中的游离氟［J］. 青岛科技大学学报(自然科学版), 2021, 42(5): 14-18.

YIN Xiuzhen, NIU Shuyan, ZHANG Tao, et al. Determination of free fluorine in tea by ion chromatography［J］. Journal of Qingdao University of Science and Technology（Natural Science Edition), 2021， 42（5）： 14-18.

Determination of Free Fluorine in Tea by Ion Chromatography

YIN Xiuzhen1,2, NIU Shuyan1, ZHANG Tao2, LI Sha3, CUI He2

(1.College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China;

2.Technology Center of Qingdao Customs, Qingdao 266002, China;

3.College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China)

Abstract: A simple and accurate analytical method for determination of fluorine in the tea by using ion chromatography (IC) has been developed. After the sample was soaked and ultrasonically extracted, it is measured by ion chromatography. A good linearity was obtained in the range of 0020—1000 mg·L-1 with regression correlation coefficients (R2) larger than 0.999. The obtained limit of detection (LOD) were 2.0 mg·kg-1 for F-. The mean recoveries at three spiked concentration levels (low, middle, and high) were 90.94%—97.73%, and the relative standard derivations (RSDs) were 082%—306%(n=7). Under the optimized IC parameters, the content of free fluorine in tea was 18.88—157.37 mg·kg-1, and the relative standard deviation is 111%—401% (n=7). This method can be used for rapid detection of free fluorine content in tea.

Key words: tea; free fluorine; ultrasonic extraction; ion chromatography

收稿日期： 2020-11-17

基金项目： 国家重大科学仪器设备开发专项项目（2012YQ090229）.

作者简介： 尹秀贞（1995—），女，硕士研究生.*通信联系人.