在受污染的浅层含水层中,对多环芳香化合物 (PAC) 的同位素取证
Jason M E Ahad1, Richard Martel2, Angus I Calderhead3
1Geological Survey of Canada, Natural Resources Canada, Québec, QC, G1K 9A9, Canada.
Chemosphere
|September 14, 2023
概括
地下水中的多环芳香化合物 (PAC) 的稳定碳同位素比例 (δ13C) 证实了历史上柴油泄漏是主要污染源. 这种方法有效地确定了事件发生数十年后的来源,将其与其他潜在的工业投入区分开来.
科学领域:
- 环境科学 环境科学
- 地质化学 地质化学
- 水文地质学 水文地质学
背景情况:
- 20世纪80年代末发生的历史性柴油泄漏事件影响了加拿大北克省的浅地下水层.
- 修复工作取得了部分成功,但剩余的石油碳化合物和最近可能的泄漏继续影响地下水质量.
- 地下水中高水平的多环芳香化合物 (PAC) 表明目前或过去的污染.
研究的目的:
- 确定受影响水层中多环芳香化合物 (PAC) 污染的主要来源.
- 评估特定化合物的稳定碳同位素比率 (δ13C) 对地下水污染物的来源分配的有效性.
- 区分历史的柴油污染和青或燃料油#6.6的潜在贡献.
主要方法:
- 在地下水样本中分析各个PAC和PAC组的化合物特定稳定碳同位素比率 (δ13C).
- 从地下水中得到的 δ13C 值与青和燃料油的参考样本进行比较 #6.
- 同位素分析包括双,甲,,二二,甲,甲和甲/甲组.
主要成果:
- 在地下水样本中,五个单个PAC和两个PAC组的δ13C值在所有监测井中都是一致的.
- 地下水中的PAC的同位素特征与青和燃料油6的不同,排除了它们作为重要的来源.
- 一致的 δ13CPAC 值强烈表明了一个单一的,共同的污染源,归因于历史的柴油泄漏.
结论:
- 化合物特定的稳定碳同位素比率 (δ13CPAC) 有效地确定了历史的柴油泄漏是浅层水表中PAC污染的主要来源.
- 这种同位素技术为地下水中的污染源分配提供了一种可靠的方法,即使是在最初释放几十年后.
- 这项研究证明了 δ13C 分析在水文地质环境中的环境法医学的长期实用性.
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