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

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 fl uorescence 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.