用于大批量甲和聚合同位素分析的低温吸附剂的性能
Nico Kueter1,2, Naizhong Zhang3, Jan G C Meissner1
1Department of Earth and Planetary Sciences, ETH Zurich, Zürich, Switzerland.
Rapid communications in mass spectrometry : RCM
|April 11, 2025
概括
凝是冷甲捕获的最佳吸附剂,可保存同位素的签名. 无吸附剂的捕获对大样本起作用,但吸附剂对于小体积和高精度至关重要.
科学领域:
- 地质化学 地质化学
- 分析化学 分析化学
- 同位素科学 同位素科学
背景情况:
- 低温捕获甲对于准确的批量和聚合同位素分析至关重要.
- 吸附材料是有效的甲回收和同位素特征保存所需的.
- 评估不同的吸附剂是优化甲同位素分析的关键.
研究的目的:
- 评估二氧化凝,二氧化分子和活性炭用于冷甲捕获的性能.
- 为了确定不同的捕获和脱吸条件对甲同位素特征的影响,特别是凝聚的同位素.
- 确定最佳的吸附剂和条件,以保持甲同位素的完整性.
主要方法:
- 使用各种吸附剂 (凝,化物5A/13X,活性炭) 和没有吸附剂的对照剂,在77K处冷聚焦甲参考气体.
- 使用水浴 (21°C-95°C) 进行了脱落,停留时间各不相同.
- 大量 (δD-CH4, δ13C-CH4) 和聚集的 (∆13CH3D, ∆12CH2D2) 同位素使用量子级联激光吸收光谱学 (QCLAS) 来测量.
主要成果:
- 在50°C下5分钟或21°C-22°C下120分钟的粗粒凝产生了最好的结果,保留了同位素特征.
- 高溶解温度 (>80°C) 对聚集的同位素的保存产生了负面影响.
- 焦石和活性炭由于催化作用和同位素分离而引起了显著的同位素转移,而无吸附剂的捕获则没有显示出大量和凝聚同位素的显著分离.
结论:
- 凝是冷甲捕获的优质吸附剂,保持大容量,可重复性和同位素准确性,用于散装和聚集的同位素.
- 无吸附剂的冷捕获适用于大量的甲,其中蒸汽压力同位素效应可以忽略不计.
- 低温吸附剂对于小样本量和高精度同位素分析至关重要,建议选择凝.
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