食品科学 ›› 2010, Vol. 31 ›› Issue (20): 351-354.doi: 10.7506/spkx1002-6630-201020073

• 分析检测 • 上一篇    下一篇

微波消化微量滴定法测定牛乳中的钙含量

杜建中1,杨美波1,朱永斌1,丁 玎2,3   

  1. 1.湛江师范学院 广东高校新材料工程技术开发中心 2.圣地亚哥州立大学公共卫生学院 3.加州大学圣地亚哥分校预防医学系
  • 收稿日期:2009-12-10 修回日期:2010-05-14 出版日期:2010-10-25 发布日期:2010-12-29
  • 通讯作者: 杜建中 E-mail:djz560119@126.com
  • 基金资助:

    湛江师范学院科学研究基金资助项目(L0514)

Determination of Calcium Concentration in Milk by Microwave Digestion and Micro-titration

DU Jian-zhong1,YANG Mei-bo1,ZHU Yong-bin1,DING Ding2,3   

  1. 1. Development Center for New Materials Engineering and Technology in Universities of Guangdong, Zhanjiang Normal University,
    Zhanjiang 524048, China;2. Graduate School of Public Health, San Diego State University, San Diego 92123, USA;
    3. Department of Family and Preventive Medicine, University of California, San Diego 92037, USA
  • Received:2009-12-10 Revised:2010-05-14 Online:2010-10-25 Published:2010-12-29
  • Contact: DU Jian-zhong1 E-mail:djz560119@126.com

摘要:

应用微波消化及微量滴定技术,对牛乳中的钙含量进行测定。结果表明:用5mL 浓HNO3、3mL H2O2的混合液对10.00mL 样品进行消化,加入0.4mL 三乙醇胺消除Al3+、Fe3+ 对钙离子测定的影响,取得了较好的测定效果。伊利纯牛奶和高钙奶的EDTA 标准液消耗体积平均值分别为1.616、1.450mL,RSD 分别为0.16% 和0.32%,7 次测定的回收率为98%~101.5%。与传统的消化方法及常量滴定法相比,该法具有简单、快速、节省试剂、环境污染小等优点。

关键词: 钙, 微量滴定法, 微波消化, 牛乳

Abstract:

The determination of calcium concentration in milk was achieved using microwave digestion and micro-titration. Satisfying results of determining Ca2+ concentration in milk were obtained when a 10.00 mL sample of milk was digested with a mixture consisting of 5 mL of 98% HNO3 and 3 mL of H2O2 fortified with 0.4 mL of triethanolamine for eliminating the interference from Al3+ and Fe3+. The average consumptions of EDTA standard solution for Yili branded pure milk and high calcium milk were 1.616 mL and 1.450 mL with RSDs of 0.16% and 0.32%, respectively. The average spike recovery rate of seven replicate determinations was in the range of 98% to 101.5%. The accuracy and precision of the micro-titration method were both comparable to those of the traditional digestion and titration methods. This method is a simple, rapid, reagent-saving and environmentally friendly.

Key words: calcium, micro-titration, microwave digestion, milk

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