微波消解-电感耦合等离子体光谱法测定铝塑包装奶粉中铝的含量

Determination of aluminum content in milk powder packaged with aluminum-plastic by microwave digestion-inductively coupled plasma emission spectrometry

目的建立一种微波消解-电感耦合等离子体光谱仪器测定铝塑包装奶粉中铝的含量的方法。方法样品经微波消解并赶酸,采用电感耦合等离子体光谱（inductively coupled plasma emission spectrometry,ICP-AES）检测方法上机,通过样品中铝的信号强度和浓度成正比,对34种铝塑包装奶粉中的铝含量进行测定。结果该方法检出限为0.72 mg/kg,线性相关系数为0.9998,加标回收率为95.4%~98.6%。检测的34种铝塑包装奶粉中铝的残留量较少,均在低于0.72~1.28 mg/kg之间。结论该方法简便、快速、准确、所需样品量少,为奶粉的质量安全提供了技术保证。

Objective To establish a method for the determination of aluminum content in milk powder packaged with aluminum-plastic by microwave digestion-inductively coupled plasma emission spectrometry. Methods Thirty-four aluminum-plastic packaged milk powder samples were digested by microwave oven. Aluminum in aluminum-plastic packaged milk powder was detected by inductively coupled plasma emission spectrometry （ICP-AES） and the signal was in proportion to the concentration of aluminum in samples. Results The detection limit was 0.72 mg/kg and the linear correlation coefficient was 0.9998 with the good recovery in the range of 95.4%-98.6%. Aluminum in 34 aluminum-plastic packaged milk powder samples was less with the range of less than 0.72 to 1.28 mg/kg. Conclusion The established method is simple, rapid, accuracy, and requires a few samples, providing technical guarantee for the safety of milk powder.