三种方法测试岩溶水样氢氧同位素的对比研究

杨 会; 王 华; 吴 夏; 唐 伟; 蓝高勇; 涂林玲

doi:10.11932/karst20180418

三种方法测试岩溶水样氢氧同位素的对比研究

doi: 10.11932/karst20180418

中国地质科学院岩溶地质研究所/自然资源部、广西岩溶动力学重点实验室

基金项目: 国土资源部公益性行业科研专项同位素地质样品分析方法行业标准（DZ/T0184.2-0148.22-1997）修订”（201411075）；国家自然科学基金项目“桂林盘龙洞洞穴滴水和沉积物对极端降水事件的记录研究”（41501222）

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出版历程
- 发布日期: 2018-08-25

Comparative study of three methods for testing hydrogen and oxygen isotope of karst water samples

Institute of Karst Geology, CAGS/ Key Laboratory of Karst Dynamic, MNR & GZAR, Guilin, Guangxi

摘要

摘要: 通过高温热转换元素-同位素比值质谱法（TC/EA-IRMS）、多用途气体制备仪-同位素比值质谱法（GasbenchⅡ-IRMS）以及激光光谱法对岩溶水样进行对比检测，其结果显示：对于氢同位素，TC/EA-IRMS的精密度达到0.3 ‰，激光光谱法的精密度达到0.1 ‰，均优于GasbenchⅡ-IRMS的精密度1.4 ‰；对于氧同位素，GasbenchⅡ-IRMS的精密度达到0.02 ‰，激光光谱法的精密度达到0.04 ‰，优于TC/EA-IRMS的精密度0.16 ‰。使用激光光谱法测定岩溶水样的氢氧同位素，所需要的样品量少，精密度高，能够满足岩溶区样品的高精度测试要求。
- 质谱法 /
- 光谱法 /
- 氢氧同位素 /
- 岩溶水
Abstract: Compared with water samples in non-karst areas, water samples in karst areas have higher Ca2+ content, and this characteristics has certain impact on the hydrogen-oxygen isotope test results in water bodies. In this paper, three commonly used methods of high temperature conversion/elemental analysis, i.e. isotope ratio mass spectrometry (TC/EA-IRMS), sample preparation device-stable isotope mass spectrometer (GasbenchⅡ-IRMS) and laser spectroscopy for the detection of hydrogen-oxygen isotopes of water samples in karst areas were applied to conduct a comparative study. The study area is the underground river of Maocun village, located in Chaotian township, Lingchuan county, Guilin City. The underground river outlet, cave drip water and karst groundwater samples were collected and analysed by using the above methods. Testing results show that,for the hydrogen isotope, in general the precision of TC/EA-IRMS is not more than (≤) 0.3‰, while the precision of laser spectroscopy is ≤0.1‰，and both are better than the GasbenchⅡ-IRMS with a precision of 1.4‰. For the oxygen isotope, the precision of GasbenchⅡ-IRMS is ≤0.02‰,laser spectroscopy is≤0.04‰，and both are better than TC/EA-IRMS with the precision of 0.16‰. Therefore, the determination of hydrogen and oxygen isotopes of the water samples in karst area by laser spectroscopy can meet the high precision test requirements of the samples in karst area due to the small quantity of samples and high precision. However, due to the existence of a high temperature gasification chamber in the laser spectrometer, and if the high salinity karst water is continuously tested for a long time, whether the gasification efficiency of the water sample affected by the consolidation of the salt in the gasification chamber needs further study.
- isotope ratio mass spectrometry /
- laser spectroscopy /
- hydrogen and oxygen stable isotopes /
- karst water samples

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