稳定同位素红外光谱技术测定CO2同位素校正方法的研究进展

doi:10.17521/cjpe.2017.0206

摘要/Abstract

摘要：

稳定同位素红外光谱(IRIS)技术克服了传统的大气CO₂气瓶采样-同位素质谱(IRMS)技术时间分辨率低且耗时费力的缺点, 可以实现高时间分辨率和高精度的大气CO₂碳同位素组成(δ ¹³C)和氧同位素组成(δ ¹⁸O)的原位连续测定。基于IRIS技术测量CO₂δ ¹³C和δ ¹⁸O的误差来源主要包括δ ¹³C和δ ¹⁸O测量值对CO₂浓度变化的非线性响应(浓度依赖性)以及对环境条件变化的敏感性导致的漂移(时间漂移)。如何有效地校正浓度依赖性和时间漂移导致的误差是IRIS仪器应用的前提。该综述阐述了δ ¹³C和δ ¹⁸O测量值的浓度依赖性产生的理论基础, 回顾了浓度依赖性的理论校正和经验方程校正方法和应用; 回顾了时间漂移的校正原理、方法和应用; 概述了数据溯源至国际标准的原理、方法与应用现状。结合实际情况推荐利用3个或3个以上已知CO₂浓度和δ ¹³C、δ ¹⁸O真值的CO₂标准气体涵盖待测气体CO₂浓度的浓度依赖性校正, 设置适当的校正频率校正时间漂移并进行数据溯源。指出应该加强不同仪器和校正方法的比对研究; 采用IRIS技术测定CH₄、N₂O和H₂O同位素组成也可以采取类似的校正方法。

关键词: 稳定同位素红外光谱, 浓度依赖性, 时间漂移, 数据溯源, 校正频率

Abstract:

With the development of isotope ratio infrared spectroscopy (IRIS) technology, it is now possible for the in situ high temporal resolution and high precision measurement of carbon isotopic composition (δ ¹³C) and oxygen isotopic composition (δ ¹⁸O) of atmospheric CO₂, which overcomes the low temporal resolution and labor intensive shortcoming of traditional isotope ratio mass spectrometry (IRMS). The dependence of δ ¹³C and δ ¹⁸O on CO₂ concentration (termed as concentration dependence) and the drift due to sensitivity to changing environmental conditions (termed as instrumental drift) are the two main sources of error affecting the IRIS measurements. Therefore, it is important to obtain precise measurements by constructing a proper calibration strategy to solve the concentration dependence and instrumental drift. In this study, we briefly discussed the definition and related theoretical principle of concentration dependence, and elaborated the theoretical and empirical calibration methods of concentration dependence. Moreover, we introduced the calibration methods of instrumental drift, and reviewed the state of the art of calibration methods and its application of IRIS technology. Additionally, we briefly discussed the definition and method of data traceability to the international standard, and reviewed its application of IRIS technology. Finally, we recommend that concentration dependence is corrected by using three standards or above with known CO₂ concentration and its δ ¹³C and δ ¹⁸O, bracketing the CO₂ concentration of samples. The instrumental drift is corrected by setting appropriate calibration frequency and all dataset are traceable to the international standard. In the future, the comparative study of different IRIS instruments and calibration methods should be enhanced, and the similar methods should be used for measuring CH₄, N₂O and H₂O isotopes by IRIS technique. The IRIS technology combined with other technology will provide a new opportunity for ecological research.

Key words: isotope ratio infrared spectroscopy, concentration dependence, instrumental drift, traceability to the international standard, calibration frequency

庞家平, 温学发. 稳定同位素红外光谱技术测定CO₂同位素校正方法的研究进展. 植物生态学报, 2018, 42(2): 143-152. DOI: 10.17521/cjpe.2017.0206

Jia-Ping PANG, Xue-Fa WEN. A review of the calibration methods for measuring the carbon and oxygen isotopes in CO₂ based on isotope ratio infrared spectroscopy. Chinese Journal of Plant Ecology, 2018, 42(2): 143-152. DOI: 10.17521/cjpe.2017.0206

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稳定同位素红外光谱技术测定CO₂同位素校正方法的研究进展

A review of the calibration methods for measuring the carbon and oxygen isotopes in CO₂ based on isotope ratio infrared spectroscopy

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