碱提取-电感耦合等离子体质谱法测定食品中的碘  

Determination of iodine content in food by inductively coupled plasma-mass spectrometry with alkali extraction

作　　者：姜杰[1] 张慧敏[1] 林凯[1] 王超[1] 阮莎莎 李瑞园[1] 陈裕华[1] 刘桂华[1] JIANG Jie;ZHANG Hui-Min;LIN Kai;WANG Chao;RUAN Sha-Sha;LI Rui-Yuan;CHEN Yu-Hua;LIU Gui-Hua(Shenzhen Center for Disease Control and Prevention,Shenzhen 518055,China)

机构地区：[1]深圳市疾病预防控制中心,深圳518055

出　　处：《食品安全质量检测学报》2021年第6期2235-2239,共5页Journal of Food Safety and Quality

基　　金：深圳市三名工程项目(SZSM201811070);食品安全国家标准制定(spaq-2016-172);深圳市医学重点学科(SZXK066)。

摘　　要：目的建立碱提取-电感耦合等离子体质谱法测定食品中碘含量。方法样品经5%四甲基氢氧化铵(tetramethylammonium hydroxide,TMAH)溶液于85℃±5℃提取3 h,离心后取上清液,以铼作为内标,采用电感耦合等离子体质谱法(inductively coupled plasma-mass spectrometry,ICP-MS)测定。结果在0.5~50μg/L的线性范围内,回归方程呈现良好的线性关系,r=0.9998。该方法检出限为0.003 mg/kg,定量限为0.01 mg/kg,回收率为94%~102%之间,相对标准偏差小于10%。结论该方法操作简单,灵敏度高,适用于食品中碘含量的测定。Objective To establish a method for determination of iodine content in food by inductively coupled plasma-mass spectrometry with alkali extraction.Methods Samples were extracted by 5%tetramethylammonium hydroxide(TMAH)at 85℃±5℃for 3 h.The supernatants after centrifugal were determined by inductively coupled plasma-mass spectrometry(ICP-MS)with Re as internal standard.Results The calibration curve showed good linear relationship in the range 0.5-50μg/L with good correlation coefficients(r=0.9998).The limit of detection was 0.003 mg/kg and the limit of quantification was 0.01 mg/kg.The spiked recoveries were 94%-102%,the relative standard deviation was less than 10%.Conclusion This method is simple and sensitive,it is suitable for the determination of iodine in food.

关 键 词：碘 电感耦合等离子体质谱 食品 

分 类 号：O657.63[理学—分析化学] TS207.3[理学—化学]