高氯酸盐稳定氯、氧同位素测试新技术  

New Measurement Technique for Stable Chlorine and Oxygen Isotopic Compositions of Perchlorate

作　　者：李小倩[1,2] 方玲[1] 刘运德[2] 张梦南[3] 

机构地区：[1]中国地质大学环境学院,武汉430074 [2]中国地质大学生物地质与环境地质国家重点实验室,武汉430074 [3]中国地质调查局水文地质环境地质调查中心,河北保定071051

出　　处：《地质科技情报》2015年第4期200-204,共5页Geological Science and Technology Information

基　　金：国家自然科学基金项目(41202169);中央高校基本科研业务费专项资金资助项目(CUGL140407)

摘　　要：高氯酸盐同位素测试技术能够为环境介质中高氯酸盐污染物来源的判识、降解途径与修复效果的监测与评价提供重要的分析工具。在国内建立高氯酸盐稳定氯、氧同位素测试技术,采用真空热解方法组建同位素真空制样系统,并结合GasBenIIIRMS联用技术实现在线高精度测试。实验结果表明,真空制样系统稳定性高,最佳热解反应温度为650℃,样品量约10μmol ClO-4。δ18 O、Δ17O和δ37Cl的方法分析精度分别为0.3‰,0.04‰和0.1‰,达到国际水平,为我国高氯酸盐环境污染的防治研究提供了先进的方法与手段。Stable chlorine and oxygen isotopic compositions of perchlorate can provide an important analyti- cal tool for tracing sources as well as monitoring and evaluating its degradation pathways and remediation effects. In order to develop a new technique for the determination of stable chlorine and oxygen isotopic compositions of perehlorate, a vacuum isotope preparation system is established using a vacuum pyrolysis method, combined with a GasBenII-IRMS online measurement. The vacuum pyrolysis system showed high stability, with the best pyrolysis temperature of 650 ℃ and a minimum amount of 10μmol ClO4-. The ana- lytical precisions of δ18, △170 and δ37C1 are 0.3‰, 0.04‰ and 0.1%, respectively, which is consistent with international level. This isotopic measurement can provide advanced means for prevention and remedi- ation research on environmental contamination of perehlorate.

关 键 词：高氯酸盐 氯同位素 氧同位素 真空热解法 

分 类 号：P641.3[天文地球—地质矿产勘探]