氨基酸作为春季排水事件期间自来水中的气味化合物的潜在前体
Caley B Craven1, Nicholas J P Wawryk1, Kristin Carroll1
1Division of Analytical and Environmental Toxicology, Department of Laboratory Medicine and Pathology, University of Alberta, Edmonton, Alberta, Canada T6G 2G3.
Environmental science & technology
|August 7, 2023
概括
融雪中的氨基酸 (AAs) 可以标志着春季排水的开始,并引起不愉快的自来水气味. 监测AAs有助于预测和管理这些间歇性气味事件.
科学领域:
- 环境化学环境化学
- 分析水质 分析水质
- 有机地化学 有机地化学
背景情况:
- 预测春季排水和相关的自来水气味事件仍然具有挑战性.
- 常见的水质参数不能完全解释间歇性气味问题.
- 小的极地水溶性化合物,如氨基酸 (AAs),首先从冰/雪融中浸出.
研究的目的:
- 研究氨基酸 (AAs) 作为自来水中引起气味的化合物的潜在标记物.
- 确定AA发生与春季下水过程中的自来水气味之间的关系.
- 确定在化时由AAs形成的特定的引起气味的化合物.
主要方法:
- 在2021年和2022年春季下水期间,从两个处理厂收集了源水.
- 评估了300多个家庭的自来水气味概况.
- 使用高分辨率质谱 (MS) 和MS/MS.测量AA度.
- 在化过程中从检测到的AA中确认了甲胺的形成.
主要成果:
- 在2021年,AA度较低 (<100 ng/L),但在2022年显著更高 (高达5500 ng/L).
- 2022年AA水平升高与自来水臭味投诉增加相关.
- 在2022年下游开始时,AA度的峰值与报告中最强烈的气味一致.
- 在化过程中,从6个检测到的AAs中确认了甲胺的形成.
结论:
- 氨基酸 (AAs) 作为春季排水开始的有效标志物.
- 亚胺酸代表小,极性,水溶性有机物,有助于自来水的气味.
- 监测AA可以帮助预测和减轻化自来水中的气味问题.
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