Abstract An extensive field survey was conducted in four types of road area to study heavy metals in road runoff. Eleven rainfall events were monitored from February 2011 to March 2012, which were classified into four categories according to the relationship between peak of the rainfall amount, rainfall duration, and average rainfall intensity. Runoff samples were collected from overpass sections, college areas, residential areas, and road sidewalks. Heavy metal concentrations were obtained to investigate the outflow laws governing heavy metals in runoff. The concentration fluctuations of seven heavy metals were monitored to assess the influence of rainfall characteristics on metal concentrations. To estimate the impact of heavy metals on the water environment, the event mean concentrations (EMCs) were determined to describe the overall pollution degree of heavy metal in runoff, and then the EMC values of heavy metals in runoff were compared with surface water environmental quality standard thresholds. The results indicate that the EMC values of heavy metals varied widely in different rainfall fields and under the same rainfall at different sampling points. Average rainfall intensity has a significant impact on the EMC of heavy metal outflow, followed by maximum rainfall intensity and rainfall amount.

中文翻译：

---

南京市区道路径流重金属污染特征

摘要对四种类型的道路区域进行了广泛的实地调查，以研究道路径流中的重金属。2011年2月至2012年3月监测了11次降雨事件，根据降雨量峰值、降雨持续时间和平均降雨强度之间的关系将其分为四类。径流样本是从立交桥路段、大学区、住宅区和道路人行道收集的。获得重金属浓度以研究径流中重金属的流出规律。监测七种重金属的浓度波动，评估降雨特征对金属浓度的影响。为了估算重金属对水环境的影响，确定事件平均浓度（EMC）来描述径流中重金属的总体污染程度，然后将径流中重金属的EMC值与地表水环境质量进行比较标准阈值。结果表明，不同降雨场、不同采样点相同降雨量下，重金属EMC值差异较大。平均降雨强度对重金属流出EMC影响显着，其次是最大降雨强度和降雨量。