离子色谱法测定饱和卤水中痕量碘离子  

Determination of Trace Iodide in Saturated Brine Using Ion Chromatography

作　　者：韩静[1] 梁立娜[1] 牟世芬[1] 蔡亚岐[1] 鲁毅强[2] 

机构地区：[1]中国科学院生态环境研究中心环境化学与生态毒理学国家重点实验室,北京100085 [2]北京科技大学化学系,北京100083

出　　处：《分析化学》2008年第2期187-191,共5页Chinese Journal of Analytical Chemistry

基　　金：国家重点基础研究计划(973)(No.2003CB415001);中国科学院重要方向性项目(No.KZCX3-S-SW-432)

摘　　要：建立了一种在线样品预处理、脉冲安培检测饱和卤水中痕量I^-的离子色谱新方法。进样体积为50止，选用CryptandC1浓缩柱富集I^-，并用10mmol／L NaOH洗脱样品中的基体Cl^-。用0．5mmol／LNaOH将I^-从浓缩柱转移到保护柱柱端。用IonPac AS20阴离子交换柱，25mmol／L NaOH淋洗分离，结合脉冲安培银工作电极检测。I^-检出限为0．07μg／L（3倍基线噪音）；I^-在5～1000μg／L范围内具有良好的线性关系（r=0．9995）。50μg／L的I^-溶液连续进样9次，峰高相对标准偏差（RSD）为1．0％。A new method was developed for the determination of iodide in saturated brine by ion chromatography with pulsed amperometric detection and in-line pretreatment. IonPac Cryptand C1 column was used to concentrate iodide from 50 μL sample volume, which was subsequently rinsed with 10 mmol/L NaOH to remove interfering chloride. The iodide was elute from the concentrator by 0. 5 mmol/L NaOH and on the head of the AG20 guard column. The separation of iodide was achieved on an IonPac AS20 column with 25 mmol/L NaOH as eluent. The detection limit of iodide was 0. 07 μg/L （50μL injection, signal-to-noise ratio of 3 ） and the linear range of the calibration curve of peak height vs analyte concentration was from 5.0 μg/L to 1000 μg/L. Relative standard deviations （RSD） of the peak height for 0. 05 mg/L iodide was 1.0% （n =9）.

关 键 词：饱和卤水 I^- 离子色谱 脉冲安培 

分 类 号：O657.75[理学—分析化学] X832.02[理学—化学]