食品科学 ›› 2001, Vol. 22 ›› Issue (11): 82-84.

• 分析检测 • 上一篇    下一篇

流动注射浊度分析法测定茶叶中钾的研究

 王立群,  杨俊,  夏玲   

  1. 安徽省轻工业设计院工艺室; 中国科学技术大学食品科学与工程系
  • 出版日期:2001-11-15 发布日期:2012-02-14

A Study on Trubidimetric Determination of Potassium in Tea by Flow Injection Analysis

 WANG  Li-Qun,   Yang-Jun,   Xia-Ling   

  • Online:2001-11-15 Published:2012-02-14

摘要: 在聚乙烯醇介质中,基于钾离子和四苯硼钠形成稳定的胶体沉淀,建立了流动注射浊度法测定钾的快速分析方法。钾离子浓度在0~25.0μg/ml范围内符合比耳定律,相关系数0.9985。采用微波溶样,测定茶叶中钾,回收率在94.6%~103.4%之间,相对标准偏差小于3%。比较火焰光度法测定,结果满意。

关键词: 流动注射分析, 浊度法, 微波溶样, 茶叶, 钾, 四苯硼钠

Abstract:  In the polyviny alcohol medium,a flow injection analysis on turbidimetric determination of potassium was studied.The method was based on the reaction of potassium with sodium tetraphenylboron(TPB) to form a stable colloidal precipitation.Beer’ s law was obeyed in the range 0? 25.0μ g/ml of potassium.The samples were digested by microwave.The recovery obtained by standard addition method was 94.6% ? 103.4% .The relative standard deviations obtained (n=8) was less than 3% .The frequency of analysis was 60 samples per hour.The proposed method was rapid,simple and convenient and it has been applied successfully to determine potassium in tea samples.

Key words:  , Flow injection analysis Turbidimetry Microwave digestion Tea Potassium TPB;