College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518060, China.
Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Theoretical Chemistry of Environment, School of Environment, South China Normal University, Guangzhou, 510006, China.
Environ Monit Assess. 2024 Aug 7;196(9):791. doi: 10.1007/s10661-024-12951-1.
The presence of polycyclic aromatic hydrocarbons (PAHs) pollution on urban road surfaces is one of the major environmental concerns. However, knowledge on the distribution variability of PAHs in road dusts (RDS) and stormwater is limited, which would restrict the further risk evaluation and mitigation implementation of PAHs in road stormwater runoff. This study collected RDS samples and stormwater samples on fourteen urban roads in Shenzhen, China. This study investigated the variation of sixteen PAHs species in RDS and stormwater, and further evaluated the intrinsic and extrinsic factors which influence PAHs accumulation on urban road surfaces. The research outcomes showed significant differences on spatial distribution of PAHs in RDS and in stormwater. The land use types, industrial, commercial and port areas and vehicular volume have a positive relationship with PAHs abundance while dust particle size showed a negative correlation with PAHs abundance. For two phases in stormwater, fluctuation of PAHs with the rainfall duration in total dissolved solid (TDS) was more intensive than in dissolved liquid phase (DLP). This indicated when PAHs attached to RDS enter stormwater, most of PAHs still tend to be on solid particles than in liquid. The study outcomes are expected to contribute to efficient designs of PAHs polluted stormwater mitigation.
多环芳烃（PAHs）污染在城市路面上的存在是主要的环境问题之一。然而，有关道路灰尘（RDS）和雨水中文中 PAHs 的分布变异性的知识有限，这限制了对道路雨水径流中 PAHs 的进一步风险评估和缓解措施的实施。本研究在中国深圳的 14 条城市道路上收集了 RDS 和雨水样本。本研究调查了 RDS 和雨水中 16 种 PAHs 物质的变化，并进一步评估了影响城市道路表面 PAHs 积累的内在和外在因素。研究结果表明，RDS 和雨水中的 PAHs 空间分布存在显著差异。土地利用类型、工业、商业和港口区以及车流量与 PAHs 丰度呈正相关，而粉尘粒径与 PAHs 丰度呈负相关。对于雨水的两个阶段，PAHs 在总溶解固体（TDS）中的雨持续时间波动比在溶解液相（DLP）中的波动更剧烈。这表明当 RDS 上的 PAHs 进入雨水时，大部分 PAHs 仍倾向于存在于固体颗粒上而不是液体中。研究结果有望为 PAHs 污染雨水的缓解设计提供有效的帮助。
