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从下水道管道维修中排放的空气废物中有机成分的多样性

Ana C Morales¹, Christopher P West¹, Brianna N Peterson¹

¹College of Science, Department of Chemistry, Purdue University, West Lafayette, IN, USA. alaskin@purdue.edu.

Environmental science. Processes & impacts

|September 8, 2023

概括

污水管道修复的空气排放废物是城市污染的新来源. 这些废物含有复杂的有机化合物,可以形成大气中的气溶和纳米塑料,可能超过环境限制.

科学领域:

环境化学环境化学
城市污染研究城市污染研究
大气科学大气科学

背景情况:

无沟沟下水道管道维修技术释放空气中的废物.
这种废物是城市大气污染的一个研究不足的来源.

研究的目的:

为了描述排放到空气中的污水管道维修废弃物凝结物的分子组成.
识别有机物种及其与大气分区和气溶形成相关的特性.

主要方法:

从四个现场地点收集了水相废弃物冷凝液样本.
使用逆相液态色谱 (RPLC) 与光二极管阵列检测 (PDA) 和高分辨率质谱 (HRMS) 相结合.
使用大气压光离子化 (APPI) 和电喷离子化 (ESI) 进行质谱测量.

主要成果:

识别了有机物种的复杂混合物,具有可变的分子量,结构和氧化状态.
检测到氧化有机物,含N和S的化合物,以及凝结的芳香物.
发现75-85%的化合物是半挥发性至极低挥发性,高粘度表明水蒸发后形成半固体/固体相.

结论:

无沟下水道修复的空气排放废物含有各种各样的有机化合物.
这些化合物可以导致大气中二次有机气溶和纳米塑料颗粒的形成.
选定成分的量化度表明,可能会超过法规限制.

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