混合标准溶液在乳粉检测中的应用

Application of mixed standard solution in milk powder detection

中文关键词:  混合标准溶液  乳粉中常量元素  检测  基体效应

英文关键词:mixed standard solution  major elements in milk powder  detection  matrix effect

中文摘要:

      目的 去除乳粉检测时共存元素的基体效应和干扰问题, 提高测试效率。方法 将钾、钠、钙、镁、铁、锌、铜、锰、磷的单元素标准溶液配制成多元素混合标准溶液, 用于乳粉中常量元素的检测。分析混合标准溶液对于乳粉中常量元素检测时的优势, 阐述应用混合标准溶液进行测定时的关键点。采用电感耦合等离子体发射光谱法(inductively coupled plasma atomic emission spectrometry, ICP-OES)进行标准溶液稳定性研究。结果 采用混合标准溶液测定, 能解决基体效应的问题。不同日期该混合标准溶液系列的校准曲线回归方程相关系数均大于0.999; 并对质控样品进行分析, 使用保存12个月的混合标准溶液进行测定结果仍在标准值的范围内。结论 混合标准溶液在乳粉检测时能提高乳粉中常量元素检测的准确性和测试效率。能在常温下稳定保存12个月。

英文摘要:

      Objective To remove the matrix effect and interference of coexisting elements in milk powder detection, and improve the test efficiency. Methods The single element standard solution of potassium, sodium, calcium, magnesium, iron, zinc, copper, manganese and phosphorus was prepared into mixed standard solution for the determination of major elements in milk powder. The advantages of mixed standard solution for the detection of major elements in milk powder were analyzed. This paper expounds the key points in the application of mixed standard solution for determination. The stability of standard solution was studied by inductively coupled plasma atomic emission spectrometry (ICP-OES). Results The matrix effect could be solved by using the mixed standard solution. The correlation coefficients of the calibration curve regression equation of the mixed standard solution series on different dates were all greater than 0.999. The quality control samples were analyzed, and the determination results were still within the standard value range using the mixed standard solution stored for 12 months. Conclusion The mixed standard solution can improve the accuracy and efficiency of the determination of major elements in milk powder. It can be stored at room temperature for 12 months.