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目的建立电感耦合等离子发射光谱法测定乳制品中铝的分析方法,并进一步优化样品前处理方法。方法采用微波消解法处理牛奶和乳扇样品,电感耦合等离子发射光谱测定样品中的铝含量,并进行了连续测定7次的精密度实验和加标回收准确度实验。结果铝元素在0～10 mg/L范围内线性关系良好,方法的检出限是0.6 mg/kg,定量限是1.8 mg/kg,其精密度为5.09%～6.05%,加标回收率94%～101.92%。通过测定市售乳制品发现,牛奶中铝含量正常,乳扇中铝含量偏高。结论本方法简便准确,为研究乳制品中金属元素含量提供一定参考。
Objective To establish an analytical method for the determination of aluminum in dairy products by inductively coupled plasma atomic emission spectrometry and to further optimize the sample preparation method. Methods Milk and milk fan samples were processed by microwave digestion method. The content of aluminum in the samples was determined by inductively coupled plasma atomic emission spectrometry. The accuracy of seven consecutive experiments and the accuracy of spiked recovery were tested. Results The results showed that the linearity of the elemental aluminum in the range of 0 ~ 10 mg / L was good. The detection limit was 0.6 mg / kg, the limit of quantification was 1.8 mg / kg, the precision was 5.09% ~ 6.05% % ~ 101.92%. Through the determination of commercially available dairy products found that the normal content of aluminum in milk, high content of aluminum in milk fan. Conclusion The method is simple and accurate, which can provide reference for the study of metal elements in dairy products.