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Position: Home > Articles > Determination of Calcium Concentration in Milk by Microwave Digestion and Micro-titration FOOD SCIENCE 2010,31 (20) 351-354

微波消化微量滴定法测定牛乳中的钙含量

作  者：
杜建中;杨美波;朱永斌;丁玎
单  位：
湛江师范学院;圣地亚哥州立大学公共卫生学院
关键词：
钙;微量滴定法;微波消化;牛乳
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、3mLH2O2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。
译  名：
Determination of Calcium Concentration in Milk by Microwave Digestion and Micro-titration
作  者：
DU Jian-zhong1,YANG Mei-bo1,ZHU Yong-bin1,DING Ding2,3 (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)
关键词：
calcium;micro-titration;microwave digestion;milk
摘  要：
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.

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