在线燃烧系统用于测量气体参考材料中的δ13C-CH4,使用光学同位素比分光谱学
Aimee Hillier1, Eric Mussell-Webber1, Emily Hopkinson1
1National Physical Laboratory, Hampton Road, Teddington, Middlesex TW11 0LW, U.K.
Analytical chemistry
|June 9, 2025
概括
精确的稳定碳同位素比率测量甲 (δ13C-CH4) 对于跟踪排放至关重要. 本研究提出了一种使用燃烧和光学同位素比谱学的可靠方法,用于在空气参考材料中证明δ13C-CH4.
科学领域:
- 环境科学 环境科学
- 分析化学 分析化学
- 大气科学 大气科学
背景情况:
- 在甲中稳定的碳同位素比例 (δ13C-CH4) 对于识别甲排放源至关重要.
- 准确和可重复的参考材料对于全球大气监测网络至关重要.
- 现有的方法需要可靠的校准标准来精确地确定 δ13C-CH4.
研究的目的:
- 开发和验证一种方法来证明合成空气参考材料中甲的C-CH值.
- 为了确保可追溯到维也纳Pee Dee Belemnite (VPDB) 尺度,以进行精确的大气测量.
- 为了在空气参考材料中建立高可重现度的 δ13C-CH4测量.
主要方法:
- 合成空气参考材料中的甲 (CH4) 通过直接燃烧转化为二氧化碳 (CO2).
- 使用光学同位素比分谱学 (OIRS) 分析了燃烧产品的 δ 13 C-CO 2 .
- 测量结果与可追溯到δ13CVPDB尺度的CO2参考材料进行了对比.
主要成果:
- 四种具有明显 δ13C-CH4值 (-39.07‰和-51.91‰) 的参考材料得到了认证.
- 在配对的参考材料之间实现了0.17‰内的测量可重复性.
- 综合扩展的不确定性 (k=2) 从0.4‰到1.5‰不等,流速灵敏度可以忽略不计.
结论:
- 燃烧系统与OIRS相结合,提供了一种可靠的方法来测量δ13C-CH4.
- 这种方法可以在可追溯到VPDB尺度的空气参考材料中认证δ13C-CH4.
- 开发的技术支持准确的大气监测和甲排放源归因.
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