PREPARATION AND HANDLING OF METHANE FOR RADIOCARBON ANALYSIS AT COLOGNEAMS

IF 2 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Radiocarbon Pub Date : 2023-12-12 DOI:10.1017/rdc.2023.109
Jan Olaf Melchert, Martina Gwozdz, Merle Gierga, Lukas Wacker, Dennis Mücher, Janet Rethemeyer
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Abstract

CH4 is the second most important anthropogenic greenhouse gas and originates from different sources. The use of radiocarbon (14C) analysis of CH4 opens up the possibility to differentiate geological and agricultural origin. At the CologneAMS facility, the demand for 14C analysis of CH4 required the development of a sample handling routine and a vacuum system that converts CH4 to CO2 for direct injection of CO2 into the AMS. We evaluated the processing of CH4 using several series of gas mixtures of 14C-free and modern standards as well as biogas with sample sizes ranging from 10 to 50 µg C. The results revealed a CH4 to CO2 conversion efficiency of 94–97% and blank values comparable to blank values achieved with our routinely used vacuum system for processing CO2 samples. The tests with a near modern CH4:CO2 biogas mixture gave reproducible results with a near modern 14C content of 0.967–1.000 F14C, after applying the background correction.

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在科隆进行放射性碳分析时甲烷的制备和处理
CH4 是第二大人为温室气体,其来源各不相同。通过对 CH4 进行放射性碳(14C)分析,可以区分地质来源和农业来源。科隆原子吸收光谱仪(AMS)设施需要对 CH4 进行 14C 分析,因此需要开发一套样品处理程序和真空系统,将 CH4 转化为 CO2,直接注入原子吸收光谱仪。结果显示,CH4 到 CO2 的转化效率为 94-97%,空白值与我们常规使用的处理 CO2 样品的真空系统的空白值相当。使用接近现代的 CH4:CO2 生物气混合物进行的测试结果具有可重复性,在应用背景校正后,其 14C 含量接近现代水平,为 0.967-1.000 F14C。
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来源期刊
Radiocarbon
Radiocarbon 地学-地球化学与地球物理
CiteScore
16.20
自引率
6.00%
发文量
85
审稿时长
6-12 weeks
期刊介绍: Radiocarbon serves as the leading international journal for technical and interpretive articles, date lists, and advancements in 14C and other radioisotopes relevant to archaeological, geophysical, oceanographic, and related dating methods. Established in 1959, it has published numerous seminal works and hosts the triennial International Radiocarbon Conference proceedings. The journal also features occasional special issues. Submissions encompass regular articles such as research reports, technical descriptions, and date lists, along with comments, letters to the editor, book reviews, and laboratory lists.
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