

激光同位素光谱法测量水中氢氧同位素组成的实验室间比对研究
国土资源部广西岩溶动力学重点实验室, 中国地质科学院岩溶地质研究所, 广西 桂林 541004 |
Inter-Laboratory Comparison of Analysis for Hydrogen and Oxygen Stable Isotope Ratios in Water Samples by Laser Absorption Spectroscopy
Key Laboratory of Karst Dynamics, Ministry of Land and Resources & Guangxi, Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin 541004, China |
摘要:激光同位素光谱分析方法是近些年使用较广泛的一种便捷、快速的测试稳定同位素组成的技术,能同时分析出水中δD、δ18O同位素组成,因其操作简单,检测效率高,体积小,野外现场测试携带方便,迅速在环境、地质、生态和能源等领域得到广泛应用,但是该测试分析方法尚没有相应的国家标准,测试结果得不到有效的溯源,在使用过程中缺乏规范和统一。为此,本文通过在全国范围内12家实验室选取8个比对水样(δD值在-189.1‰~-0.4‰内,δ18O值在-24.52‰~0.32‰内),利用激光同位素光谱法测试比对D/H和18O/16O值,探讨激光同位素光谱仪分析水中δD、δ18O值的准确度和精密度。测试结果表明:各个协作实验室数据准确、稳定,方法的重复性和再现性良好;激光光谱法测定的δD精密度为0.4‰(1σ),δ18O精密度为0.05‰(1σ),与传统稳定同位素质谱的精度几乎一致,因此适用于常规水样中δD、δ18O测定,可以开展野外在线实时检测水中氢氧同位素组成。本研究为开展制定激光同位素光谱法测定环境液态水中δD、δ18O同位素组成标准方法的工作推广和应用提供了参考。
Inter-Laboratory Comparison of Analysis for Hydrogen and Oxygen Stable Isotope Ratios in Water Samples by Laser Absorption Spectroscopy
ABSTRACT Laser Absorption Spectroscopy technology is a convenient and rapid method for the simultaneous determination of hydrogen and oxygen isotope ratios in environmental water samples. This method has been widely used in the environment, geology, ecology, and energy fields due to its simplicity, high detection efficiency, and portability. However, no national standards are available for this method and thus the analytical results are not traceable effectively. Moreover, the use of this method lacks norms and unity. In order to evaluate the accuracy and precision of the Laser Absorption Spectroscopy method for the determination of δD, δ18O, D/H and 18O/16O values of eight water samples (δD value of within -189.1‰-0.4‰, δ18O value of within -24.52‰-0.32‰), values were determined by 12 laboratories using optical cavity enhanced absorption spectroscopy. Data from each collaboration laboratory is accurate, stable, and reproducible. The precision value of δD is 0.4‰ (1σ) and δ18O is 0.05‰ (1σ), comparable to the traditional mass spectrometry method. Therefore, the method is suitable for the on-line and real-time determination of hydrogen and oxygen isotope ratio in the field. This study provides a reference for the development and application of the standard method for determination of δD and δ18O isotopes in environmental water.

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