浓度直读法快速测定低钠盐中的钾  

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

作　　者：高向阳[1,2] 赵琛[2] 游新侠[1] 

机构地区：[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　　处：《食品科学》2013年第14期267-270,共4页Food Science

基　　金：河南省重点学科建设基金项目(10466-X-082301)

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。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.

关 键 词：离子选择性电极 浓度直读法 低钠盐 钾 

分 类 号：O657.15[理学—分析化学]