食品科学 ›› 2013, Vol. 34 ›› Issue (24): 254-257.doi: 10.7506/spkx1002-6630-201324053

• 工艺技术 • 上一篇    下一篇

能量色散X射线荧光光谱法测定奶粉中的钙元素

王冬圻,姜瞻梅,田 然,田 波   

  1. 东北农业大学 乳品科学教育部重点实验室,食品学院,黑龙江 哈尔滨 150030
  • 收稿日期:2013-01-31 修回日期:2013-11-08 出版日期:2013-12-25 发布日期:2014-01-03
  • 通讯作者: 田波 E-mail:tianbot@163.com

Determination of Calcium in Milk Power by Energy Dispersive X-Ray Fluorescence Spectrometry

WANG Dong-qi,JIANG Zhan-mei,TIAN Ran,TIAN Bo   

  1. Key Laboratory of Dairy Science , Ministry of Education, College of Food Science, Northeast Agricultural University, Harbin 150030, China
  • Received:2013-01-31 Revised:2013-11-08 Online:2013-12-25 Published:2014-01-03

摘要:

目的:探索一种较为简便的奶粉中钙元素的检测方法。方法:采用能量色散X射线荧光光谱法,样品无需消化处理,直接压片进行测量,每个样品的测量时间为160s,探索出仪器的最佳测试条件。结果:建立标准曲线方程为:y=2.2769x-0.2771,相关系数为0.9988。对该方法的准确度和精密度进行分析,相对标准偏差小于5%,与国标法火焰原子吸收法相比,测量数值基本吻合,回收率在97%~105%之间。结论:能量色散X射线荧光光谱法同其他方法相比,可以对固体样品直接测量,实验过程中不产生有害气体,节省人力、物力、时间,能够作为一种方便快捷、快速有效的方法检测奶粉中的钙元素。

关键词: 能量色散X射线荧光光谱法, 钙元素, 奶粉, 测定

Abstract:

Objective: To explore a simple method for the determination of calcium in milk power. Methods: Samples
were prepared by a pressing method without acid digestion. Each sample was detected for 160 s by energy dispersive X-ray
fluorescence spectrometry. This paper explored the best working conditions of the machine. Results: A standard curve was
established. The calibrated equation was y = 2.2769x - 0.2771 with liner correlation coefficient of 0.9988. The accuracy
and precision of the method was analyzed, and the measured values were accorded with those from flame atomic absorption
method that is the standard method in our country. The recoveries were in the range of 97%-105% with relative standard
deviation of less than 5%. Conclusion: The energy dispersive X-ray fluorescence spectrometry method can directly detect
solid samples when compared with other methods. This method has the advantages of no emission of toxic gas during the
experiment, labor-saving operation and less consumption of materials and time . It can be used as a convenient, rapid and
effective way to test the content of calcium in milk powder.

Key words: energy dispersive X-ray fluorescence spectrometry, calcium, milk power, determination

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