离子色谱-柱切换进样抑制电导检测环丁砜中的杂质阴离子  

Determination of ppb level anions in sulfolane by ion chromatography with a novel column-switching injection system

作　　者：陈梅兰[1] 李长安[2] 焦霞[3] 朱岩[3] 

机构地区：[1]浙江树人大学生物与环境工程学院,浙江杭州310015 [2]浙江科技学院经济管理学院,浙江杭州310023 [3]浙江大学化学系,浙江杭州310028

出　　处：《浙江大学学报（理学版）》2008年第2期200-203,共4页Journal of Zhejiang University（Science Edition）

基　　金：国家自然科学基金资助项目(20375035);浙江省自然科学基金资助项目(z404105)

摘　　要：研究了采用离子色谱法一柱切换进样抑制电导检测环丁砜样品中的阴离子的分析方法．采用美国Dionex公司ICS90型离子色谱仪，用9mmol·L^-1 Na2CO3淋洗．一根短柱连接在定量环中作浓缩柱，进样时，首先使低浓度的环丁砜中阴离子富集在浓缩柱中，大部分对柱子可能有损害的有机物被除去，然后再切换到分析柱中进行分离检测，可成功地测定环丁砜中的Cl^-、NO3^-、SO4^2-等痕量阴离子．实验表明该方法的检测限〈2．22×10^-9，回收率为96．24％～107．51％．A simple method for the simultaneous determination of inorganic anions （Cl^- , NO3^- , SO4^2- ） in sulfolane with a novel column-switching injection system was reported. A pre-concentration column was used for the enrichment of the low concentration of anions in sulfolane. As a result, the organic matrix could be excluded from the analyte before the separation process to avoid any infection on the analytical column, as well as the detect limit could be lowered. After being switched to analytical system, the separation was performed using 9 mmol · L^-1 sodium carbonate as the eluent at a flow of 0.25 mL · min^-1. The detection limit （signal to noise of 3 ： 1） of this method can be reached to ppb level （〈2.22×10^-9） due to the enrichment. The simple way can be applied to the detection of real samples successfully. The recoveries for the anions were between 96.24%-107.51%.

关 键 词：离子色谱 环丁砜 阴离子 

分 类 号：O657.7[理学—分析化学]