电感耦合等离子发射光谱测定乳扇中的铝含量

Determination of aluminum content in dairy fan by inductively coupled plasma optical emission spectrometry

目的建立电感耦合等离子发射光谱法测定乳扇中铝含量的分析方法。调查市售样品中铝的含量是否异常。方法采用湿式消解法处理乳扇样品,电感耦合等离子发射光谱测定样品中铝的含量,同时进行精密度实验和加标回收实验。测定市场收集的乳扇样品中铝的含量,并与严格按云南省地方标准(DBS53/010-2016)制作的乳扇样品进行比较。结果铝在0～10 mg/L范围内线性关系良好,相关系数r达0.999928,方法的检出限为0.5 mg/kg,定量限为1.5 mg/kg,精密度为2.5%～3.1%,加标回收率在96.6%～105.0%之间。按地方标准制作的乳扇样品中铝含量较低,在3.2～5.3mg/kg之间,部分市场收集的样品中铝含量偏高。结论本方法操作简便、结果准确,可作为乳扇中铝含量检测的方法。乳扇应严格按照地方标准制作。

Objective To establish a method for the determination of aluminum element in dairy fan by inductively coupled plasma optical emission spectrometry（ICP-OES）, and investigate whether the aluminum contents of the dairy fans collected from the market were abnormal. Methods Dairy fan samples were preprocessed by wet digestion method. The content of aluminum in the sample was determined by ICP-OES. The precision experiment and the standard recovery experiment were also carried out. The content of aluminum in the milk fan samples collected in the market was measured and compared with those made strictly according to the local standard of Yunnan province（DBS 53/010-2016）. Results Aluminum element had a good linear relationship within the range of 0-10.0 mg/L with the correlation coefficient（r） of 0.999928. The limit of detection was 0.5 mg/kg, and the limit of quantitation was 1.5 mg/kg. The recoveries of standard additions ranged from 96.6% to 105.0% with the relative standard derivations between 2.5%-3.1%. The contents of aluminum in dairy fans produced according to DBS53/010-2016 were low（3.2-5.3 mg/kg）, while in some of the dairy fans collected from the market were much higher. Conclusion This method is simple and accurate, which can be used for the determination of aluminum content in dairy fan. Dairy fans should be made in strict accordance with local standards. The production process of fan should be standardized.