色谱

色谱

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离子色谱-电感耦合等离子体质谱法测定植物性样品中的碘及其形态

林立1*, 陈光1, 陈玉红2   

  1. 1. 国家食品质量安全监督检验中心, 北京 100094; 2. 安捷伦科技(中国)有限公司, 北京 100102
  • 收稿日期:2011-04-07 修回日期:2011-05-24 出版日期:2011-07-28 发布日期:2011-08-19
  • 通讯作者: 林立,高级工程师,博士研究生,研究方向为分析化学.
  • 基金资助:

    国家质量监督检验检疫总局科研课题项目(No. 2007QK71)

Determination of iodine and its species in plant samples using ion chromatography-inductively coupled plasma mass spectrometry

LIN Li1*, CHEN Guang1, CHEN Yuhong2   

  1. 1. China Food Quality Safety Supervision and Inspection Center, Beijing 100094, China; 2. Agilent Technologies (China) Co., Ltd., Beijing 100102, China
  • Received:2011-04-07 Revised:2011-05-24 Online:2011-07-28 Published:2011-08-19

PDF

598

被引次数

45

摘要： 建立了离子色谱-电感耦合等离子体质谱联用(IC-ICP/MS)测定植物性样品中碘及其形态的方法。采用碱提取法处理样品后,应用IC-ICP/MS检测植物样品中的碘离子和碘酸根;采用高温裂解法处理样品,使样品中各种形态的碘最终均转化为碘离子,然后应用IC-ICP/MS检测碘离子,从而实现总碘的测定。碘的方法检出限为0.010 mg/kg。碱提取法和高温裂解法处理样品的碘的加标回收率分别为89.6%～97.5%和95.2%～111.2%,结果令人满意。按照所建立的方法分别考察了紫菜、海带、圆白菜、茶叶、菠菜等常见植物性样品中碘的存在形式,结果表明,紫菜中的碘以有机碘为主,而海带、圆白菜、茶叶、菠菜中的碘则以无机碘为主。

关键词: 碘, 碘形态, 离子色谱-电感耦合等离子体质谱, 植物

Abstract: A method was established for the determination of iodine and its species in plant samples using ion chromatography-inductively coupled plasma mass spectrometry (IC-ICP/MS). Alkaline extraction and IC-ICP/MS were applied as the sample pre-treatment method and the detection technique respectively, for iodate and iodide determination. Moreover, high-temperature pyrolysis absorption was adopted as the pre-treatment method for total iodine analysis, which finally converted all the iodine species into iodide and measured the iodide by IC-ICP/MS. The recoveries of iodine for alkaline extraction and high-temperature pyrolysis absorption were 89.6%~97.5% and 95.2%~111.2%, respectively. The results were satisfactory. The detection limit of iodine was 0.010mg/kg. The iodine and its speciation contents in several kinds of plant samples such as seaweeds, kelp, cabbage, tea leaf and spinach were investigated. It was shown that the iodine in seaweeds mainly existed as organic iodine; while the ones in kelp, cabbage, tea leaf and spinach mainly existed as inorganic iodine.

Key words: IC-ICP/MS, iodine and its species, plant samples