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Position: Home > Articles > A Study on Trubidimetric Determination of Potassium in Tea by Flow Injection Analysis FOOD SCIENCE 2001,22 (11) 82-84

流动注射浊度分析法测定茶叶中钾的研究

作  者:
王立群;杨俊;夏玲
单  位:
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
关键词:
流动注射分析;浊度法;微波溶样;茶叶;钾;四苯硼钠
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。
译  名:
A Study on Trubidimetric Determination of Potassium in Tea by Flow Injection Analysis
作  者:
Wang Liqun et al.
关键词:
Flow injection analysis Turbidimetry Microwave digestion Tea Potassium TPB
摘  要:
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.

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