ICP-MS法测定银系抗菌食品接触塑料中银含量与迁移量  

Determination of Ag Content and Migration in Silver-Based Antibacterial Food Contact Plastics by ICP-MS

作　　者：禄春强[1] 万峰 代亚男 李军[1] LU Chunqiang;WAN Feng;DAI Yanan;LI Jun(Shanghai Institute of Quality Inspection and Technical Research,Shanghai 201114)

机构地区：[1]上海市质量监督检验技术研究院,上海201114

出　　处：《食品工业》2022年第5期326-329,共4页The Food Industry

基　　金：由上海市科学技术委员会研发公共服务平台建设项目《上海市日用消费品质量安全检测专业技术服务平台》(项目编号:14DZ2293000)资助。

摘　　要：比较微波消解(硝酸)、微波消解(硝酸+盐酸)、湿法消解(硫酸+过氧化氢)3种前处理方式对银含量测试的影响,选择4%乙酸溶液(V/V)食品模拟物,建立电感耦合等离子体质谱(ICP-MS)测定银系抗菌食品接触塑料制品中银含量及银迁移量的方法。优化ICP-MS工作条件,内标元素In在线添加,Ag元素的线性范围0.1~100μg/L,R^(2)为1.0000,方法检出限0.02 mg/kg,定量限0.05 mg/kg。分别在样品中做加标回收试验(10,30,60和100 mg/kg),湿法消解(硫酸+过氧化氢)加标回收率为92.8%~101.2%,重复性测定相对偏差S_(RSD)为2.2%(n=7)。对6批次样品中Ag含量及Ag迁移量进行测试,结果表明6批次样品中均有Ag检出,最大值为139.32 mg/kg。1批次样品中Ag迁移量大于0.01mg/kg。该方法检出限低,线性范围宽,满足测定的要求。The effects of three pre-treatment methods of microwave digestion(nitric acid),microwave digestion(nitric acid+hydrochloric acid)and wet digestion(sulfuric acid+hydrogen peroxide)on the Ag content test were compared,and a new method for the determination of Ag content and migration in silver-based antibacterial food contact plastics by ICP-MS was established in 4%acetic acid solution(V/V)as food stimulant.ICP-MS parameters were optimized.The In as internal standard,was added online.Linear relationships of Ag were ranged from 0.1μg/L to 100μg/L,and R^(2) was 1.0000.The detection limit and minimum limit of the method were 0.02 mg/kg and 0.05 mg/kg.The standard recovery test(10,30,60 and 100 mg/kg)was carried out in the samples respectively pre-treated by wet digestion(sulfuric acid+hydrogen peroxide),the recoveries were ranged from 92.8%to 101.2%,and the relative standard deviations(S_(RSD))was 2.2%(n=7).The Ag content and migration were detected in the 6 batches of samples,and the results showed that Ag was detected in all the samples,with the maximum value of 139.32 mg/kg,and the Ag migration in 1 batch of samples was greater than 0.01 mg/kg.This method meets the requirements of determination with low detection limit and wide linear range.

关 键 词：银 抗菌 电感耦合等离子体质谱 含量 迁移量 

分 类 号：O657.63[理学—分析化学] TS201.6[理学—化学]