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Position: Home > Articles > Rapid Determination of Potassium in Low Sodium Salt by a Direct-Reading Ion-Selective Electrode FOOD SCIENCE 2013,34 (14) 267-270

浓度直读法快速测定低钠盐中的钾

作  者:
高向阳;赵琛;游新侠
单  位:
郑州科技学院食品科学与工程学院;河南农业大学食品科学技术学院
关键词:
离子选择性电极;浓度直读法;低钠盐;钾
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。
译  名:
Rapid Determination of Potassium in Low Sodium Salt by a Direct-Reading Ion-Selective Electrode
作  者:
GAO Xiang-yang1,2,ZHAO Chen2,YOU Xin-xia1(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)
关键词:
ion selective electrode;direct reading of ion concentration;low sodium salt;potassium
摘  要:
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.

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