使用分子组成和化合物特异性同位素分析来确定PAHs在高度工业化地区沉积物的来源
Youngnam Kim1, Seongjin Hong1, Lincheon Jun2
1Department of Marine Environmental Science, Chungnam National University, Daejeon, 34134, Republic of Korea.
Environmental pollution (Barking, Essex : 1987)
|September 14, 2023
概括
稳定同位素有效地确定了乌尔山湾沉积物中的多环芳 (PAH) 来源,确定石油行业是主要贡献者. 这种方法提供了关于区域污染的宝贵见解,尽管存在一些分析挑战.
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
- 污染源的分配方式
背景情况:
- 多环芳 (PAH) 是源自各种工业和城市活动的持久性有机污染物.
- 确定特定的PAH来源对于有效的环境管理和修复策略至关重要.
- 传统的PAH来源识别方法在像乌尔山湾这样的复杂环境中可能受到限制.
研究的目的:
- 通过分子分析和化合物特异性同位素技术的结合,识别和量化乌尔山湾沉积物中多环芳 (PAH) 的来源.
- 为了比较诊断比率,正矩阵因子化和稳定同位素分析对PAH来源分配的有效性.
- 评估不同行业 (石油,有色金属,汽车) 和城市地区对海湾PAH污染的贡献.
主要方法:
- 在源地和湾区的沉积物样本中分析了15种传统的PAH和11种新兴的PAH.
- 诊断比率和正矩阵因子化 (PMF) 的应用用于初始源识别.
- 对关键PAHs (,,,,[a]) 的特定化合物稳定同位素分析 (δ13C).
- 使用贝叶斯同位素混合模型来定量分配PAH来源.
主要成果:
- 在乌尔山湾的PAH度和成分有显著的变化,即使在源区域附近.
- 诊断比率和PMF在相邻的源区域产生了不一致的结果,突出了局限性.
- 对PAHs观察到不同的δ13C配置文件,与特定的工业来源相关 (例如,在城市地区较轻的δ13C,在石油工业地区较重的δ13C).
- 贝叶斯同位素混合模型将石油工业 (45%) 确定为主要的PAH来源,其次是有色金属 (30%),汽车 (18%) 和城市 (6.3%) 的来源.
结论:
- 化合物特定的稳定同位素分析是一种强大的工具,可以在精细的尺度上解决PAH来源,并补充传统方法.
- 石油行业是乌尔山湾沉积物中PAH污染的主要原因.
- 诸如末端成员不足,分析困难和非点源影响等局限性,需要进一步研究以更广泛地应用同位素技术.
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