Determination of potassium and calcium in milk powder by energy‐dispersive x‐ray fluorescence spectrometry
Determination of potassium and calcium in milk powder by energy‐dispersive x‐ray fluorescence spectrometry
复制标题
DOI：
10.1002/xrs.1300190606
复制
发表时间：
1990-12
影响因子：
1.2
通讯作者：
M. Alvarez;V. Mazo‐Gray
中科院分区：
文献类型：
--
作者：
M. Alvarez;V. Mazo‐Gray
建立了能量色散X射线荧光(EDXRF)法同时测定奶粉中钾和钙的方法。该测量系统由Si(Li)探测器、以钛为二次靶的X射线管、DEC-350计算机和非线性拟合最小二乘程序组成。讨论了校正和标准制备的方法。奶粉按S百倍计数法分析为压片，浓度用合成标准品用标准校正图法测定。钾和钙的最低检出限分别为0.011%和0.007%。准确度是通过分析国际原子能机构的标准参考物质来确定的。验证值和实测值之间有很好的一致性。指出了该方法的潜在应用前景。
A rapid method for the simultaneous determination of potassium and calcium in milk powder by energy-dispersive x-ray fluorescence (EDXRF) spectrometry was developed. The measurement system consists of a Si(Li) detector, an x-ray tube coupled with titanium as a secondary target, a DEC-350 computer and a nonlinear fitting least-squares program. The methods of calibration and standard preparation are discussed. Milk powder was analysed as pressed pellets using counting times of 100 s. Concentrations were determined by a standard calibration graph method using synthetic standards. The minimum detection limits are 0.011% and 0.007% for potassium and calcium, respectively. The accuracy was ascertained by analysing standard reference materials from the International Atomic Energy Agency. Good agreement was found between the certified and measured values. Potential applications of this method are indicated.