摘要
采用碱浸法离子选择电极测定茶叶中氟含量,发现浸提1 h再蒸煮10 min的方法,所浸提出的氟含量高于碱浸2 h再蒸煮10 min的方法和国标法;而且样液稀释4～20倍时,对测定结果影响较小,总离子强度调节缓冲溶液的掩蔽效果较好.该测试方法重现性好,方便、快速,能满足茶叶中氟含量的测试要求.
In determining fluorine contents in tea by use of alkaline liquor pretreatment and fluoride ion-selective electrode, the results were obtained that 1 hour for alkaline liquor immersing and 10 minutes for boiling immediately is better than 2 hours and 10 minutes, and there is no effect on the determination results when the sample liquor has been diluted for 4-20 times, the measure standard deviation is less than 2%. The method is simple, rapid and has good repeatability for determining fluorine contents in tea.
出处
《江苏工业学院学报》
2004年第4期33-35,共3页
Journal of Jiangsu Polytechnic University
基金
常州科技局计划项目资助(2003019)
关键词
碱浸法
离子选择电极
茶叶
氟含量
fluorine content
fluoride ion-selective electrode
tea
pretreatment
