Short Note

Econ. Environ. Geol. 2017; 50(6): 537-544

Published online December 31, 2017

https://doi.org/10.9719/EEG.2017.50.6.537

© THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY

Calibration of δ13C values of CO2 gas with different concentrations in the analysis with Laser Absorption Spectrometry

Taeyang Jeong1, Nam C. Woo2, Woo-Jin Shin3, Yeon-Sik Bong3, Seunghyun Choi3 and Youn-Tae Kim1,3*

1Natural Science Research Institute, Yonsei University
2Department of Earth System Sciences, Yonsei University
3Korea Basic Science Institute

Correspondence to : yountae@yonsei.ac.kr

Received: November 1, 2017; Revised: November 30, 2017; Accepted: December 4, 2017

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided original work is properly cited.

Abstract

Stable carbon isotope ratio of carbon dioxide (δ13CCO2) is used as an important indicator in the researches for global climate change and carbon capture and sequestration technology. The δ13C value has been usually analyzed with Isotope Ratio Mass Spectrometer (IRMS). Recently, the use of Laser Absorption Spectrometry (LAS) is increasing because of the cost efficiency and field applicability. The purpose of this study was to suggest practical procedures to prepare laboratory reference gases for δ13CCO2 analysis using LAS. CO2 gas was adjusted to have the concentrations within the analytical range. Then, the concentration of CO2 was assessed in a lab approved by the Korea Laboratory Accreditation Scheme and the δ13CCO2 value was measured by IRMS. When the instrument ran over 12 hours, the δ13C values were drifted up to ±10‰ if the concentration of CO2 was shifted up to 1.0% of relative standard deviation. Therefore, periodical investigation of analytical suitability and correction should be conducted. Because δ13CCO2 showed the dependency on CO2 concentration, we suggested the equation for calibrating the concentration effect. After calibration, δ13CCO2 was well matched with the result of IRMS within ±0.52‰.

Keywords Stable carbon isotope, Carbon dioxide, Reference gas, Calibration method, OA-ICOS

레이저흡광분석기(Laser Absorption Spectrometry)를 이용한 CO2 가스의 탄소안정동위원소비 보정식 산출

정태양1 ·우남칠2 ·신우진3 ·봉연식3 ·최승현3 ·김연태1,3*

1연세대학교 자연과학연구원, 2연세대학교 지구시스템과학과, 3한국기초과학지원연구원

요 약

Article

Short Note

Econ. Environ. Geol. 2017; 50(6): 537-544

Published online December 31, 2017 https://doi.org/10.9719/EEG.2017.50.6.537

Copyright © THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY.

Calibration of δ13C values of CO2 gas with different concentrations in the analysis with Laser Absorption Spectrometry

Taeyang Jeong1, Nam C. Woo2, Woo-Jin Shin3, Yeon-Sik Bong3, Seunghyun Choi3 and Youn-Tae Kim1,3*

1Natural Science Research Institute, Yonsei University
2Department of Earth System Sciences, Yonsei University
3Korea Basic Science Institute

Correspondence to:yountae@yonsei.ac.kr

Received: November 1, 2017; Revised: November 30, 2017; Accepted: December 4, 2017

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided original work is properly cited.

Abstract

Stable carbon isotope ratio of carbon dioxide (δ13CCO2) is used as an important indicator in the researches for global climate change and carbon capture and sequestration technology. The δ13C value has been usually analyzed with Isotope Ratio Mass Spectrometer (IRMS). Recently, the use of Laser Absorption Spectrometry (LAS) is increasing because of the cost efficiency and field applicability. The purpose of this study was to suggest practical procedures to prepare laboratory reference gases for δ13CCO2 analysis using LAS. CO2 gas was adjusted to have the concentrations within the analytical range. Then, the concentration of CO2 was assessed in a lab approved by the Korea Laboratory Accreditation Scheme and the δ13CCO2 value was measured by IRMS. When the instrument ran over 12 hours, the δ13C values were drifted up to ±10‰ if the concentration of CO2 was shifted up to 1.0% of relative standard deviation. Therefore, periodical investigation of analytical suitability and correction should be conducted. Because δ13CCO2 showed the dependency on CO2 concentration, we suggested the equation for calibrating the concentration effect. After calibration, δ13CCO2 was well matched with the result of IRMS within ±0.52‰.

Keywords Stable carbon isotope, Carbon dioxide, Reference gas, Calibration method, OA-ICOS

레이저흡광분석기(Laser Absorption Spectrometry)를 이용한 CO2 가스의 탄소안정동위원소비 보정식 산출

정태양1 ·우남칠2 ·신우진3 ·봉연식3 ·최승현3 ·김연태1,3*

1연세대학교 자연과학연구원, 2연세대학교 지구시스템과학과, 3한국기초과학지원연구원

Received: November 1, 2017; Revised: November 30, 2017; Accepted: December 4, 2017

요 약

    KSEEG
    Apr 30, 2024 Vol.57 No.2, pp. 107~280

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