Facultad del Medio Ambiente y Recursos Naturales, Ingeniería Ambiental, Universidad Distrital F.J.C., Avda. Circunvalar Venado de Oro, Bogotá D.C., Colombia.
Environ Technol. 2011 Jul;32(9-10):997-1008. doi: 10.1080/09593330.2010.523436.
The heavy metal pollution caused by road run-off water constitutes a problem in urban areas. The metallic load associated with road sediment must be determined in order to study its impact in drainage systems and receiving waters, and to perfect the design of prevention systems. This paper presents data regarding the sediment collected on road surfaces in the city of Torrelavega (northern Spain) during a period of 65 days (132 samples). Two sample types were collected: vacuum-dried samples and those swept up following vacuuming. The sediment loading (g m(-2)), particle size distribution (63-2800 microm) and heavy metal concentrations were determined. The data showed that the concentration of heavy metals tends to increase with the reduction in the particle diameter (exponential tendency). The concentrations ofPb, Zn, Cu, Cr, Ni, Cd, Fe, Mn and Co in the size fraction <63 microm were 350, 630, 124, 57, 56, 38, 3231, 374 and 51 mg kg(-1), respectively (average traffic density: 3800 vehicles day(-1)). By increasing the residence time of the sediment, the concentration increases, whereas the ratio of the concentration between the different size fractions decreases. The concentration across the road diminishes when the distance between the roadway and the sampling siteincreases; when the distance increases, the ratio between size fractions for heavy metal concentrations increases. Finally, the main sources of heavy metals are the particles detached by braking (brake pads) and tyre wear (rubber), and are associated with particle sizes <125 microm.
道路径流水中的重金属污染是城市中的一个问题。为了研究其对排水系统和受纳水体的影响，并完善预防系统的设计，必须确定与道路沉积物相关的金属负荷。本文介绍了在西班牙北部托雷拉韦加市（Torrelavega）为期 65 天（132 个样本）收集的道路表面沉积物的数据。收集了两种类型的样本：真空干燥样本和真空吸尘后清扫的样本。测定了沉积物负荷（g m(-2)）、粒径分布（63-2800 微米）和重金属浓度。数据表明，重金属浓度随粒径减小而增加（呈指数趋势）。<63 微米粒径部分的 Pb、Zn、Cu、Cr、Ni、Cd、Fe、Mn 和 Co 的浓度分别为 350、630、124、57、56、38、3231、374 和 51 mg kg(-1)（平均交通密度：3800 辆/天）。随着沉积物停留时间的增加，浓度增加，而不同粒径部分之间的浓度比降低。随着距道路的采样点距离增加，道路上的重金属浓度降低；当距离增加时，重金属浓度的粒径比增加。最后，重金属的主要来源是制动（刹车片）和轮胎磨损（橡胶）产生的颗粒，与粒径<125 微米的颗粒有关。
