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、δ^(18)O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,δ^(18)O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、δ^(18)O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),δ^(18)O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、δ^(18)O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、δ^(18)O同位素组成标准方法的工作推广和应用提供了参考。
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,δ^(18)O,D/H and ^(18)O/^(16)O values of eight water samples(δD value of within -189.1‰--0.4‰,δ^(18)O value of within-24.52‰-0.32‰),values were determined by12 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 δ^(18)O 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 δ^(18)O isotopes in environmental water.
出处
《岩矿测试》
CSCD
北大核心
2017年第5期460-467,共8页
Rock and Mineral Analysis
基金
国土资源部公益性行业专项(21411075-03)
国家自然科学基金资助项目(41501222)
广西青年科学基金项目(2014GXNSFBA118227)
中国地质科学院岩溶地质研究所基本科研业务费项目(2016003)
关键词
激光同位素光谱法
氢同位素
氧同位素
实验室比对
环境水样
Laser Absorption Spectroscopy
hydrogen isotope
oxygen isotope
inter-laboratory comparison
environmental water sample
