高效液相色谱-电感耦合等离子体质谱测定地下水中碘形态稳定性  

Study on Speciation Stabilities of Iodine in Underground Water by High Performance Liquid Chromatography-Inductively Coupled Plasma Mass Spectrometry

作　　者：刘崴[1] 杨红霞[1] 李冰[1] 陈登云[2] 张惠娟[3] 

机构地区：[1]国家地质实验测试中心,北京100037 [2]安捷伦公司,北京100022 [3]南京农业大学资环学院,南京210095

出　　处：《分析化学》2007年第4期571-574,共4页Chinese Journal of Analytical Chemistry

基　　金：科学仪器设备升级改造专项资助项目(No2005JG200190)

摘　　要：研究了高效液相色谱-电感耦合等离子体质谱(HPLC-ICPMS)联用技术测定天然水中IO3-和I-的方法。采用ICS-A23色谱柱分离IO3-和I-,以(NH4)2CO3为流动相,浓度0.03mol/L,流速1mL/min。在Shield Torch高灵敏度条件下,进样量为1mL时IO3-及I-的方法检出限可达到0.035μg/L和0.025μg/L。可满足地下水中碘形态的定量分析。对实验中发现的IO3-及I-标准溶液的ICP-MS响应值存在显著性差异的现象进行了研究,结果表明I-形态的稳定性与溶液介质的关系很大。本实验通过改变标准溶液的储存介质解决了IO3-与I-形态不稳定的问题。在0.01%KOH介质下储存5d,两者的响应值仍能达到1∶1。In this work, a method was developed to separate and determine IO3^- and I^- by high performance liquid chromatography coupled with inductively coupled plasma mass spectrometry. ICS-A23 ion chromatography column and its guard column ICS-A2G were selected, mobile phase of the HPLC was （NH4）2CO3 of 0.03 mol/L at flow rate of 1 mL/min. The detection limits of 0. 035 μg/L for IO3 and 0. 025 μg/L for I^- were obtained when the Shield Torch high sensitivity mode of ICP-MS and 1000 μL injection volume of HPLC were applied. The detection limits can satisfy the quantified detection of the iodine speciation in the ground water. The sensitivity difference between iodate and iodide was observed by HPLC-ICP-MS system. Aslo, this problem was soluved by changing the storing medium of the standard solution. The IO3 to I^- peak area ratios by HPLC-ICP-MS measurement were still near to 1 ： 1 when the mix standard solution had been stored in the 0.01% KOH medium for 5 days.

关 键 词：碘形态分析 碘化物 碘酸盐 高效液相色谱-电感耦合等离子体质谱 地下水 

分 类 号：X832[环境科学与工程—环境工程] O657.63[理学—分析化学]