奶粉中测定微量元素样品前处理方法优化

打开文本图片集

摘 要：样品的前处理技术对分析结果的准确性影响较大。本试验利用成功合成的磁性碳纳米复合材料为净化剂，联用电感耦合等离子体质谱法建立一种同时测定奶粉中5种微量元素的样品前处理方法。试验结果表明，方法的平均回收率为89.99%～92.17%，相对标准偏差

关键词：微量元素;电感耦合等离子体质谱法;奶粉;样品前处理方法

Optimization of Pretreatment Method for Determination of Trace Eelements in Milk Powder

WANG Dongshuai1，2， XU Ruotong1，2*， HONG Xia1，2， YUAN Caixia1，2， HE Haining1，2， WANG Yu3

（1.Gansu Zhongshang Food Quality Test and Detection Co.， Ltd.， Lanzhou 730010， China; 2.Gansu Business Science and Techology Institute Co.， Ltd.， Lanzhou 730010， China; 3.Pingliang Food Inspection and Testing Center， Pingliang 744000， China）

Abstract： The pretreatment technology of samples has a great influence on the accuracy of analytical results. A sample pretreatment method for simultaneous determination of five trace elements in milk powder was established by using successfully synthesized magnetic carbon nanocomposites as purifying agent and inductively coupled plasma mass spectrometry. The results showed that the average recovery of the method was 89.99%～92.17%， the relative standard deviation was less than 5%， and the minimum detection limit was 0.025～0.086 μg·mL-1. Compared with traditional technology， the optimized sample pretreatment method applied to the rapid detection of trace elements in milk powder has the advantages of simple operation， strong adsorption capacity and low cost， and realizes the integration of enrichment and separation.

Keywords： trace elements; inductively coupled plasma mass spectrometry; powdered milk; sample pretreatment method

奶粉特别是婴幼儿奶粉是除母乳外婴幼儿的主要食物来源之一。（剩余2925字）