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Calibration of isotopologue-specific optical trace gas analysers: a practical guide

机译:特定同位素特异性光学痕量气体分析仪的校准:实用指南

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摘要

The isotopic composition of atmospheric trace gases such as CO2 and CH4 provides a valuable tracer for the sources and sinks that contribute to atmospheric trace gas budgets. In the past, isotopic composition has typically been measured with high precision and accuracy by isotope ratio mass spectrometry (IRMS) offline and separately from real-time or flask-based measurements of concentrations or mole fractions. In recent years, development of infrared optical spectroscopic techniques based on laser and Fourier-transform infrared spectroscopy (FTIR) has provided high-precision measurements of the concentrations of one or more individual isotopologues of atmospheric trace gas species in continuous field and laboratory measurements, thus providing both concentration and isotopic measurements simultaneously. Several approaches have been taken to the calibration of optical isotopologue-specific analysers to derive both total trace gas amounts and isotopic ratios, converging into two different approaches: calibration via the individual isotopologues as measured by the optical device and calibration via isotope ratios, analogous to IRMS.
机译:诸如CO2和CH4的大气痕量气体的同位素组成为源和水槽提供有助于大气痕量气体预算的源极具助理的示踪剂。在过去,通常通过同位素比质谱(IRMS)离线的同位素比率质谱(IRMS)具有高精度和精度来测量同位素组合物。近年来,基于激光和傅里叶变换红外光谱(FTIR)的红外光学光谱技术的开发提供了高精度测量的高精度测量了连续场和实验室测量中的大气痕量气体种类的一种或多种单位运动学浓度。同时提供浓度和同位素测量。已经采取了几种方法来校准光学同位素的特异性分析仪以导出总痕量气体量和同位素比率,会聚成两种不同的方法:通过由光学装置测量的单同位素和通过同位素比校准的单同位素校准,类似于IRMS。

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