快速湿法消解—电感耦合等离子体发射光谱法测定婴幼儿配方乳粉中9种矿物元素

Determination of nine mineral elements in infant formula milk powder by rapid wet digestion-inductively coupled plasma optical emission spectrosmetry

目的:为婴幼儿配方乳粉矿物元素检测提供一种快速高效的前处理方法。方法:采用快速湿法消解,消解温度120℃,消解时间90 min,利用电感耦合等离子体发射光谱(ICP-OES)检测技术对婴幼儿配方乳粉中K、Na、Ca、Mg、P、Fe、ZN、Cu、Mn等9种矿物元素进行检测。结果:9种矿物元素标准曲线的线性相关系数均在0.9999以上,用婴幼儿配方乳粉标准物质对方法进行了验证,各元素检测值均在其特性值范围内。对市售某品牌婴幼儿配方奶粉进行了加标回收率验证,回收率为95.0%~102.0%,相对标准偏差在5%以内。结论:该方法快速、高效,适用于婴儿配方乳粉中矿物元素的消解。

Objective:This study aimed to provide a rapid and efficient pretreatment method to detect the mineral elements in infant formula milk powder.Methods:Low-temperature rapid wet digestion(digesting temperature was 120℃and digesting time was 90 min)combined with the inductively coupled plasma optical emission spectroscopy(ICP-OES)was used to determine the concentrations of K,Na,Ca,Mg,P,Fe,Zn,Cu,and Mn in infant formula milk powder.Results:The linear correlation coefficients of standard curves for these nine elements were all over 0.9999.This method was verified by the reference materials in infant formula milk powder,and the detection values of each element were all within the range of their characteristic values.Besides,the spiked recovery rate of elements in a commercial infant milk powder was verified.Its recovery rate was 95.0%~102.0%and the relative standard deviation was within 5%.Conclusion:This method was fast and efficient,which is suitable for the digestion of mineral elements in infant formula milk powder.