安徽农业大学学报2011，Vol.38Issue(1)：27-30,4.DOI:CNKI:34-1162/S.20110107.1523.026
茶叶氟化物提取方法对比与电位法测定条件优化
Comparison of extraction methods and potentiometric determination of fluoride in tea
摘要
Abstract
The different methods for extracting fluoride from tea were compared, and the potentiometric method for determining fluoride in tea liquid was optimized.The results showed that the recoveries with the boiling water extraction method(93.17％)were higher than those with the shaking extraction in acidic water(68.19％) and the ultrasonic extraction(62.38％).In this paper,the linear range of potentiometric determination of fluoride in tea was between 30 and 200 mg.kg-1,and the mean recovery was 90.48％ with the square of the correlation coefficient(R2)of 0.992 2.The limit of quantification(LOQ)and limit of detection (LOD) were 54 mg.kg-1 and 18 mg·kg-1,respectively.The fluoride contents in four tea samples from Anhui province were ranged from 52.26 mg.kg-1 to 73.80 mg.kg-1,and the fluoride components in spring tea were lower than that in autumn tea,and both of them were lower than that of the national standard of fluoride in tea(200 mg.kg-1).The results provide reliable methods for rapid determination and quality assessment of fluoride in tea.关键词
茶叶/氟化物/提取方法/电位法测定Key words
tea/fluoride/extraction method/potentiometric determination分类
农业科技引用本文复制引用
张显晨,郜红建,张正竹,宛晓春..茶叶氟化物提取方法对比与电位法测定条件优化[J].安徽农业大学学报,2011,38(1):27-30,4.基金项目
安徽省自然科学基金(090411009),教育部科学技术研究重点项目(210097),中国博士后基金(20090450800)和安徽省博士后基金(090411009)共同资助. （090411009）
