电感耦合等离子体发射光谱法同时测定婴幼儿配方乳粉中12种元素

采用电感耦合等离子体发射光谱法同时测定婴幼儿配方乳粉中K、Ca、Na、Mg、Cu、Fe、Mn、Zn、Al、Pb、Cd、Cr 12种元素的含量,对仪器工作参数进行优化.各待测元素的标准曲线的相关系数均不低于0.9995,方法检出限为0.02～5mg/kg,样品加标回收率在87.5％～106.3％之间,检测结果的相对标准偏差小于5％.该法具有快速、准确的特点,可作为乳粉的质量控制和安全评价.

Simultaneous Determination of Twelve Elements in Milk Powder for Infants and Young Children by Inductively Coupled Plasma Atomic Emission Spectrometry

A method for the simultaneous determination of twelve elements (K, Ca, Na, Mg, Cu, Fe, Mn, Zn, Al, Pb, Cr and Cd) in milk powder for infants and young children by inductively coupled plasma atomic emission spectrometry (ICPAES) was established. Instrumental parameters were optimized. Standard curves for these twelve elements were obtained with correlation coefficients greater than 0.9995. The detection limits of the ICP-AES method for these elements were in the range of 0.02 to 5 mg/kg, and the spiked recoveries were 87.5%–106.3% with RSD lower than 5% (n = 6). This method was rapid and accurate and could be used for quality control and safety evaluation of milk powder.