现场演示基于溶剂的采样方法,用于对气相VOC进行化合物特异性同位素分析
Daniel Bouchard1, Daniel Hunkeler2, Massimo Marchesi3
1GHD, 4600 Boul Cote Vertu, Montreal, QC, Canada; Centre for Hydrogeology and Geothermics (CHYN), University of Neuchâtel, Rue Emile Argand 11, Neuchâtel CH-2000, Switzerland.
一种新的基于溶剂的采样方法准确地测量了气相挥发性有机化合物 (VOC) 中的碳同位素. 这种技术可靠地用于环境研究中跟踪VOC来源.
科学领域:
- 环境化学环境化学
- 同位素地球化学 同位素地球化学
- 分析化学 分析化学
背景情况:
- 挥发性有机化合物 (VOC) 是重要的环境污染物.
- 化合物特定同位素分析 (CSIA) 是源鉴定和命运研究的强大工具.
- 准确的采样方法对于可靠的气相VOC的CSIA至关重要.
研究的目的:
- 为CSIA评估一种基于溶剂的新型采样方法,用于收集气相VOC.
- 评估该方法在提供精确和准确的碳同位素 (δ13C) 测量方面的可靠性.
- 为了比较气态VOC与它们的源材料 (NAPL) 和地下水的同位素值.
主要方法:
- 使用合成碳化合物来源进行了一项受控的实地研究.
- 甲醇被用作溶剂,从土壤空气和废气中积累石油碳化合物.
- 碳同位素分析 (δ13C) 对五种特定的挥发性有机物 (,,o-,环,八) 进行.
主要成果:
- 基于溶剂的方法证明了产生精确和准确的δ13C测量的能力.
- 大多数样本中,气态VOC和NAPL源之间的同位素差异是最小的 (<1‰).
- 这项研究是首次从单个样本中报告高达五个气相VOC的δ13C测量.
结论:
- 基于溶剂的采样方法对气相VOC的CSIA可靠.
- 该方法分析多个VOC的能力加强了气态VOC及其来源之间的联系的评估.
- 这种方法支持CSIA在VOC蒸汽研究和法医调查中的应用.
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