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 alumi-num-plastic by microwave digestion-inductively coupled plasma emission spectrometry

中文关键词:  电感耦合等离子体光谱法  铝  铝塑包装奶粉

英文关键词:inductively coupled plasma emission spectrometry  aluminum  aluminum-plastic package milk powder

中文摘要:

      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。

英文摘要:

      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.