使用液体-液体提取和固相提取技术检查碳化合物氧化产品的组成选择性
Phoebe Zito1, Rana Ghannam1, Maxwell L Harsha1
1Department of Chemistry, Chemical Analysis Mass Spectrometry Facility, Pontchartrain Institute for Environmental Sciences, University of New Orleans, New Orleans, Louisiana 70148, United States.
Environmental science & technology
|September 25, 2025
概括
液体-液体提取 (LLE) 低估了地下水中的极性碳化合物氧化产物 (HOP). 固体相提取 (SPE) 为环境监测提供了更准确的检测这些石油生物降解副产品.
科学领域:
- 环境化学环境化学
- 分析化学 分析化学
- 地质化学 地质化学
背景情况:
- 碳化合物氧化产品 (HOP) 是石油生物降解的极性,水溶性副产品.
- 准确检测HOP对于了解地下水中的石油污染和生物降解过程至关重要.
- 目前的监管监测经常使用液体液体提取 (LLE),但其对HOP的效率值得怀疑.
研究的目的:
- 评估LLE的分析局限性和组成选择性与地下水中HOP的固相提取 (SPE) 相比.
- 为了比较各种HOP类的LLE和SPE的提取效率和偏差.
- 为HOP分析提供LLE和SPE性能的定量数据.
主要方法:
- 分析了来自MN州Bemidji原油泄漏现场的地下水样本.
- 激发发射矩阵 (EEM) 光谱和 PARAFAC 建模用于描述光学性质.
- 使用超高分辨率质谱 (UHR-MS) 来识别和量化提取的化合物.
主要成果:
- LLE选择性地回收了类似阿里法的化合物,但极性氧化HOPs的代表性不足.
- SPE方法在分离高氧化化合物等级方面更有效.
- LLE的精度较低,对极地HOP的代表性也较低,从而引入了分析偏差.
结论:
- LLE在地下水HOP的表征中引入了显著的偏差,特别是代表极地化合物的不足.
- 与LLE.LLE相比,SPE提供了更全面,更准确的各种HOP的恢复.
- 这些发现对于完善长期地下水监测和对石油污染的现场评估协议具有关键意义.
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