摘要
建立了离子色谱-电感耦合等离子体质谱联用(IC-ICP/M S)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/M S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/M S检测碘离子,从而实现总碘的测定。碘的方法检出限为0.010m g/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。
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.
出处
《色谱》
CAS
CSCD
北大核心
2011年第7期662-666,共5页
Chinese Journal of Chromatography
基金
国家质量监督检验检疫总局科研课题项目(No.2007QK71)
关键词
离子色谱-电感耦合等离子体质谱
碘
碘形态
植物
ion chromatography-inductively coupled plasma mass spectrometry（IC-ICP/MS）
iodine
iodine species
plants
