Abstract: An inductively coupled plasma-optical emission spectrometry (ICP-OES) method for the determination of aluminum in baby formula was developed. The sample was digested by microwave digestion and analyzed by ICP-OES. Quantitation was performed using an external standard method. The detection limit was 0.5 mg/kg for 0.5 g of the sample digested and diluted to 25 mL. Linear relationship between emission intensity and aluminum concentration in the range of 0.01 to 50.0 μg/mL was found with a correlation coefficient (r) of 0.999 5. Average recoveries of spiked samples were between 92.2% and 107.0% with relative standard deviations (RSDs) varying from 1.43% to 2.34%. The proposed method permits efficient and accurate determination of aluminum in baby formula with wide linear range, low detection limit, good precision and high recovery and good repeatability.

Key words: inductively coupled plasma-optical emission spectrometry (ICP-OES); baby formula; aluminum

摘要： 建立电感耦合等离子体发射光谱法(inductively coupled plasma-optical emission spectrometry,ICP-OES)测定婴幼儿配方乳粉中铝的含量.样品经微波消解后用电感耦合等离子体发射光谱仪测定,采用外标法定量.结果表明:以称样量0.5 g、定容体积25 mL,计算方法检出限为0.5 mg/kg,铝的质量浓度与强度在0.01～50.0 μg/mL范围内呈线性关系,相关系数r=0.999 5,回收率在92.2％～107.0％之间,相对标准偏差在1.43％～2.34％之间.方法线性范围宽、检出限低、精密度好、回收率高、重现性好,能够快速准确地测定婴幼儿配方乳粉中铝含量.

关键词: 电感耦合等离子体发射光谱法；婴幼儿配方乳粉；铝