电感耦合等离子体发射光谱仪标准加入法测定婴幼儿配方奶粉中矿物质元素

Determination of mineral elements in infant milk powder by inductively coupled plasma atomic emission spectrometer-standard addition method

中文关键词:  婴幼儿配方奶粉  矿物质元素  标准加入法  电感耦合等离子体发射光谱仪

英文关键词:infant milk powder  mineral elements  standard addition method  inductively coupled plasma atomic emission spectrometer

中文摘要:

      目的 建立准确、可靠的样品前处理方法和上机分析程序对奶粉中的钙、铁、锌、镁、钾、钠6种矿物质元素同时进行测定。方法 采用干式消解法和微波消解法进行样品前处理, 用电感耦合等离子发射光谱仪(inductively coupled plasma optical emission spectrometer, ICP-OES)标准加入法和标准曲线法分析计算元素含量, 对比这2种分析方法的结果。结果 采用微波消解法进行前处理, 标准加入法上机分析时, 6种元素的线性关系良好, 相关线性(r2)在0.999以上, 加标回收率为97%~102%, 对质控样品的测量偏差率在0.16%~0.22%之间。结论 干式消解法和微波消解法相比, 微波消解法是更高效可行的前处理方法。相对于标准曲线法, 标准加入法对奶粉样品的测量更为精准, 适合作为少量的奶粉中矿物质元素的测定方法。

英文摘要:

      Objective To develop a more accurate and reliable sample pretreatment method and analytical procedure for the simultaneous determination of 6 selected mineral elements (Ca, K, Na, Mg, Fe and Zn) in infant milk powder. Methods Dry ashing digestion and microwave digestion methods were used for sample preparation, the content of element was detected and analyzed by inductively coupled plasma atomic emission spectrometer (ICP-OES) with standard addition method and the standard curve method, and the results of 2 methods were compared. Results When the microwave digestion method was used for pretreatment, and the standard addition method was used for computer analysis, the linear relationships between the 6 elements were good (r2＞0.999). The recoveries were between 97% and 102%, and the deviation rates of the quality control sample were between 0.16% and 2.22%. Conclusion Compared with dry ashing digestion, microwave digestion method is a more efficient and feasible pretreatment method, and compared with the standard curve method, the standard addition method is more accurate for the measurement of milk powder samples, which is suitable for the determination of mineral elements in infant milk powder.