Nie Yun-Han, Chen Hao, Li Lei, Zhu Yi, Zhao Xin, Jia Qi-Long, Xu Hui-Ting, Ye Jian-Feng
College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China.
Shanghai Academy of Environmental Sciences, Shanghai 20233, China.
Huan Jing Ke Xue. 2020 May 8;41(5):2272-2280. doi: 10.13227/j.hjkx.201910238.
Stormwater runoff pollution occurring in urban areas can be a notable threat to the ecological environments of receiving water bodies. Dissolved organic matter (DOM) constitutes the primary type of pollutant in stormwater runoff, and tracking of its components and sources can provide valuable scientific bases for the future abatement of stormwater runoff pollution. In this study, aiming to demonstrate the characteristics and sources of the contained DOM in both pavement runoff (PR) and greenland runoff (GR), we applied ultra-high-resolution Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS) to analyze the molecular chemo-diversity of their DOM, as well as Spearman rank correlations between the molecular chemo-diversity and water quality indicators including suspended solids (SS), total nitrogen (TN), dissolved organic carbon (DOC), and dissolved lead (Pb). The results show:① When the molecular accumulation reaches a saturated state, the cumulative number of molecules of PR-DOM (12498) is much larger than that of GR-DOM (7015). The molecular distribution of PR-DOM (150-750) is smaller yet more concentrated than that of GR-DOM (150-850). ② According to the molecular composition characterization and Spearman rank correlation analysis, the sources of the components of PR-DOM and GR-DOM are remarkably different. PR-DOM can be greatly influenced by human activities, and its primary element component (CHOS) contains a large number of substances that were recognized to be from the surfactant sulfonic acid. Additionally, the significant aliphatic components that emerged were from traffic pollution. In contrast, GR-DOM is less affected by human activities, and its primary element component (CHO) gives priority to natural organic matter (NOM). The most abundant substance component that occurred in GR-DOM, i.e., the highly unsaturated and phenolic compound that generally originates in the degraded humus, is initially formed by the plant residue and flushed by rainfall runoff.
城市地区发生的雨水径流污染可能对受纳水体的生态环境构成显著威胁。溶解有机物（DOM）是雨水径流中的主要污染物类型，追踪其成分和来源可为未来雨水径流污染的治理提供有价值的科学依据。在本研究中，为了阐明路面径流（PR）和绿地径流（GR）中所含DOM的特征和来源，我们应用超高分辨率傅里叶变换离子回旋共振质谱（FT-ICR-MS）分析其DOM的分子化学多样性，以及分子化学多样性与包括悬浮固体（SS）、总氮（TN）、溶解有机碳（DOC）和溶解铅（Pb）在内的水质指标之间的斯皮尔曼等级相关性。结果表明：①当分子积累达到饱和状态时，PR-DOM的分子累积数（12498）远大于GR-DOM的分子累积数（7015）。PR-DOM（150-750）的分子分布范围比GR-DOM（150-850）小但更集中。②根据分子组成特征和斯皮尔曼等级相关性分析，PR-DOM和GR-DOM的成分来源存在显著差异。PR-DOM受人类活动影响较大，其主要元素成分（CHOS）包含大量被认为来自表面活性剂磺酸的物质。此外，出现的显著脂肪族成分来自交通污染。相比之下，GR-DOM受人类活动影响较小，其主要元素成分（CHO）优先为天然有机物（NOM）。GR-DOM中出现的最丰富的物质成分，即通常源自降解腐殖质的高度不饱和和酚类化合物，最初由植物残体形成并被降雨径流冲刷出来。
