食品科学 ›› 2008, Vol. 29 ›› Issue (12): 541-543.

• 分析检测 • 上一篇    下一篇

奶粉中钠、钾、镁、钙的“动态透析”离子色谱法测定研究

 李良, 王晴   

  1. 南昌市疾病预防控制中心; 南昌理工学院;
  • 出版日期:2008-12-15 发布日期:2011-12-08

Study on Dynamic Dialyzing Ion Chromatography Determination of Sodium,Potassium,Magnesium and Calcium in Milk Powder

 LI  Liang, WANG  Qing   

  1. 1.Nanchang Municipal Center of Disease Prevention and Control,Nanchang 330006,China; 2.Nanchang Science and Technology College,Nanchang 330047,China
  • Online:2008-12-15 Published:2011-12-08

摘要: 目的:探索出较为简便易行的奶粉中钠、钾、镁、钙同时测定的方法。方法:使用透析袋将溶解后的奶粉透析后取出分别过C18柱分离后使用20mol/L甲烷磺酸作为淋洗液,用离子色谱法同时分离和测定奶粉中钠、钾、镁、钙这四种物质。结果:选择转速为200r/min室温下动态透析平衡时间只要2h左右,四物质离子色谱峰形较好,其他离子对它的干扰较小,RSD%均小于5%,回收率在95%~105%之间。结论:奶粉中钠、钾、镁、钙的"动态透析"离子色谱法测定是一种较为实用的测定方法。

关键词: 离子色谱, 奶粉, 动态透析

Abstract: Objective:To explore a simple and practicable ion chromatography method for simultaneous determination of sodium,potassium,magnesium and calcium in milk powder. Methods:After being dialyzed,milk powder solution passed through C18 column,and then the sodium,potassium,magnesium and calcium in the effluent was simultaneously detected with 20 mmol/L CH3SO3H as eluent. Results:The dynamic balance period is only two hours or so at the stirring speed of 200 r/min and room temperature. The peak shapes of the four ions are perfect without big disturbance. Their relative standard deviations are all below 5% and their average recovery rates are all between 95 % and 105%. Conclusion:Ion chromatography is suitable to the simultaneous determination of sodium,potassium,magnesium and calcium in milk powder.

Key words: ion chromatography, milk powder, dynamic dialysis