| 硫酸盐三氧同位素测试制样新技术——Ag2SO4热解法 |
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| 引用本文：周爱国,刘存富,蔡鹤生,甘义群,李小倩,余婷婷,刘运德.2008.硫酸盐三氧同位素测试制样新技术——Ag2SO4热解法[J].地球学报,29(6):673-676. |
| DOI：10.3975/cagsb.2008.06.02 |
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| 基金项目:国家自然科学基金项目“硫酸盐中17O和18O同时测试技术及其应用”和“微量水17O和18O同时测试新技术及其在水循环研究中的应用”(编号:40572140,40602030) |
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| 中文摘要:氧同位素能有效地示踪硫酸盐起源及其形成环境,随着硫酸盐中氧同位素质量不相关分馏现象的陆续发现,三氧同位素的研究已成为热点与前沿.笔者研究了硫酸盐三氧同位素(16O、17O、18O)测试制样的最新技术--Ag2SO4热解法.基本原理是:Ag2SO4在1050℃下热解为O2和SO2,其中O2产额可达(45±7)%,SO2产额接近100%,收集两种气体送作质谱分析可测得δ17O、δ18O和δ34S值.本方法的特殊要求是所有硫酸盐样品都必须转化为Ag2SO4,笔者详细介绍了水样、土样、石膏样品、BaSO4样品的处理方法与步骤.Ag2SO4热解法不再使用传统方法中的氟化试剂,安全可靠、价廉,顺应了环保意识和以人为本的原则.技术先进:适用性强,具有很大的推广应用价值. |
| 中文关键词:三氧同位素(16O、17O、18O) Ag2SO4热解法 非质量相关分馏 |
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| A New Sample Preparation Technology for Determining Tri-oxygen Isotopes in Sulfate by Ag2SO4 Pyrolysis |
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| Abstract:Oxygen isotopic composition is a very effective tool to trace the origin and formation environment of sulfate,and tri-oxygen isotopic studies have become a hot and forefront topic with the development of mass independent isotopic fractionation of sulfate. Ag2SO4 pyrolysis was dealt with in this study as a latest technology of sample preparation for analyzing tri-oxygen isotopes(16O,17O,18O)in sulfate.The basic principle is that Ag2SO4 is pyrolysed to O2 and SO2 at 1050 ℃,with the yield of O2 up to 45 ± 7% and SO2 close to 100%. The two kinds of gases can be collected to determine δ17O,δ18O and δ34S by mass spectrometry. This paper described the sample preparation method and steps to convert other sulfates to Ag2SO4 for such samples as water,soil,gypsum and BA2SO4.This is because the special requirement for the method is that all samples must be converted into Ag2SO4. The Ag2SO4 pyrolysis method dose not use the fluorination reagents employed in traditional methods, is hence safer, cheaper and more reliable than traditional means and accords with the environmental awearness and the people-oriented principle. Based on practical experience, this paper points out the advanced nature, good applicability and great popularization value of the new means. |
| keywords:tri-oxygen isotopes Ag2SO4 pyrolysis mass independent fractionation |
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