食品科学

• 分析检测 • 上一篇    下一篇

浓度直读法快速测定低钠盐中的钾

高向阳,赵 琛,游新侠   

  1. 1.郑州科技学院食品科学与工程学院,河南 郑州 450064;2.河南农业大学食品科学技术学院,河南 郑州 450002
  • 出版日期:2013-07-25 发布日期:2013-08-02

Rapid Determination of Potassium in Low Sodium Salt by a Direct-Reading Ion-Selective Electrode

GAO Xiang-yang,ZHAO Chen,YOU Xin-xia   

  1. 1. School of Food Science and Engineering, University for Science and Technology Zhengzhou, Zhengzhou 450064, China;
    2. College of Food Science and Technology, Henan Agricultural University, Zhengzhou 450002, China
  • Online:2013-07-25 Published:2013-08-02

摘要:

为建立一种快速测定食品中钾离子的新型分析方法,以郑州地区市售营养强化低钠盐为材料,用钾离子选择性电极浓度直读法快速测定样品中的钾含量。对测定体系的pH值、缓冲剂用量等条件进行优化和讨论。结果表明:钾在0.50~4000.00mg/L范围内有良好的线性,相关系数r为0.9994,方法检出限为0.063mg/L,加标回收率为100.2%~102.4%,样品测定的RSD(n=9)为0.4%。该法简便快捷、成本低廉、实用性强,利于普及推广,用于现场快速测定低钠盐中的钾,结果令人满意。

关键词: 离子选择性电极, 浓度直读法, 低钠盐,

Abstract:

A rapid analytical method for potassium in low sodium salt was developed using a direct-reading ion-selective
electrode. System pH, the amount of total ionic strength adjustment buffer (TISAB), and other factors were optimized
in this study. The results showed that the linear range was 0.50–4000.00 mg/L with correlation coefficient (r) of 0.9994.
The detection limit was 0.063 mg/L, and the recovery was 100.2%–102.4% with RSD (n = 9) of 0.4%. The method
was simple, rapid, cheap and practical, and has been applied for in situ analysis of potassium in low sodium salt with
satisfying results.

Key words: ion selective electrode, direct reading of ion concentration, low sodium salt, potassium