一种用于测定由道路沉积物冲刷雨水径流所携带的潜在重金属负荷的简化方法。
A simplified method for determining potential heavy metal loads washed-off by stormwater runoff from road-deposited sediments.
机构信息
Environmental Engineering, Faculty of Environment and Natural Resources, Francisco José de Caldas District University, Avda. Circunvalar Venado de Oro, E-111711 Bogotá D.C., Colombia.
Environmental Engineering Group (GIA), Departamento de Ciencias y Técnicas del Agua y del Medio Ambiente, E.T.S. Ingenieros de Caminos, C. y P., University of Cantabria, Avda. de los Castros s/n, E-39005 Santander, Spain.
出版信息
Sci Total Environ. 2017 Dec 1;601-602:260-270. doi: 10.1016/j.scitotenv.2017.05.178. Epub 2017 May 26.
A simplified method is proposed for determining the potential load of heavy metals (HMs) derived from the wash-off caused by surface runoff on road-deposited sediment (RDS). The method consists of three phases: (i) characterization of RDS load wash-off, (ii) assessment of HM load in dry weather, and (iii) application of a wash-off equation. Two processes were included in the wash-off equation: HM transport (solid fraction) and HM leaching (dissolved fraction). The average wash-off of HMs ranges from 16.6 to 46.3%, relative to the total mass of HMs associated with dry-weather RDS (Pb, Zn, Cu, Cr, Ni, Cd, Fe, Mn, Co, and Ba). Cd, Mn, and Zn presented the highest wash-off in the areas studied. The size fraction below 250μm contributed an average of 86.7% of potential HM load washed-off from RDS. Based on the phenomena included in the wash-off equation, it was observed the following order of precedence: transport of RDS<250μm, leaching of RDS<250μm, and leaching of RDS≥250μm. Solid and dissolved fractions contributed 70.7 and 29.3% of the potential HM load washed-off by runoff from RDS, respectively. The proposed method serves as a management tool for road HM pollution during rain.
提出了一种简化方法，用于确定由路面沉积物（RDS）表面径流冲刷引起的重金属（HM）潜在负荷。该方法包括三个阶段：（i）RDS 负荷冲刷特性描述，（ii）干季 HM 负荷评估，以及（iii）冲刷方程的应用。冲刷方程包括两个过程：HM 传输（固相）和 HM 浸出（溶解相）。相对于干季 RDS 中与 HM 相关的总质量，HM 的平均冲刷率在 16.6%至 46.3%之间（Pb、Zn、Cu、Cr、Ni、Cd、Fe、Mn、Co 和 Ba）。在所研究的区域中，Cd、Mn 和 Zn 的冲刷率最高。粒径小于 250μm 的部分平均贡献了从 RDS 冲刷出的潜在 HM 负荷的 86.7%。根据冲刷方程中包含的现象，可以观察到以下优先顺序：RDS<250μm 的传输、RDS<250μm 的浸出以及 RDS≥250μm 的浸出。径流从 RDS 冲刷出的潜在 HM 负荷中，固相和溶解相分别贡献了 70.7%和 29.3%。该方法可作为管理降雨期间道路 HM 污染的工具。
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