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High-precision measurements of water isotopes using laser absorption spectroscopy

机译：使用激光吸收光谱仪对水同位素进行高精度测量

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摘要

Hydrogen and oxygen isotopic analysis using an off-axis integrated-cavity output spectroscopy (OA-ICOS) was carefully checked for long-term stabilities, dependence on the injected water volume, inter-sample memory effects, and influence of salinity, with an aim to investigate whether it can be an alternative to conventional isotope ratio mass spectrometry (IRMS). Salinity (up to 4 wt.% NaCl) had no influence on measured values of δD and δ~(18)O, therefore the OA-ICOS technique can be applied to the analysis of seawater without demineralization. Standard errors (lσ) of δD and δ~(18)O analysis using this technique were typically 0.2-0.3%o and 0.05-0.10‰, respectively, which are completely comparable to those of conventional dual-inlet IRMS methods. The results suggest that the OA-ICOS method can be an alternative of IRMS for δD and δ~(18)O analysis of natural water. However, sporadic fluctuations of measured values were often encountered. This problem can be most likely ascribed to subtle individual differences in the quality of micro-syringes used.
机译：仔细检查了使用离轴集成腔输出光谱仪（OA-ICOS）进行的氢和氧同位素分析的长期稳定性，对注入水量的依赖性，样品间记忆效应以及盐度的影响，旨在研究它是否可以替代常规同位素比质谱法（IRMS）。盐度（NaCl含量不超过4 wt。％）对δD和δ〜（18）O的测量值没有影响，因此OA-ICOS技术可用于海水分析而无需脱盐。使用该技术进行的δD和δ〜（18）O分析的标准误差（lσ）通常分别为0.2-0.3％o和0.05-0.10‰，与传统的双进口IRMS方法完全可比。结果表明，OA-ICOS方法可替代IRMS用于天然水的δD和δ〜（18）O分析。但是，经常会遇到测量值的零星波动。这个问题很可能归因于所使用的微型注射器的质量存在细微的个体差异。

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