| 高氯酸盐稳定氯、氧同位素测试新技术 |
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| 引用本文： | 李小倩,方玲,刘运德,张梦南.高氯酸盐稳定氯、氧同位素测试新技术[J].地质科技通报,2015,34(4):200-204. |
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| 作者姓名： | 李小倩 方玲 刘运德 张梦南 |
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| 作者单位： | 1. 中国地质大学环境学院, 武汉 430074; |
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| 基金项目： | 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) |
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| 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。δ18O、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。
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| 关 键 词： | 高氯酸盐 氯同位素 氧同位素 真空热解法 |
| 收稿时间： | 2014-07-11 |
New Measurement Technique for Stable Chlorine and Oxygen Isotopic Compositions of Perchlorate |
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| Institution: | 1. School of Environmental Studies, China University of Geosciences, Wuhan 430074, China;2. Stage Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China;3. Center for Hydrogeology and Environmental Geology Survey, Baoding Hebei 071051, China |
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| Abstract: | Stable chlorine and oxygen isotopic compositions of perchlorate can provide an important analytical 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 perchlorate,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 10 μmol ClO-4.The analytical precisions of δ18O,Δ17O and δ37Cl 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 remediation research on environmental contamination of perchlorate. |
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