Science and Engineering Faculty, Queensland University of Technology (QUT), GPO Box 2434, Brisbane 4001, Queensland, Australia.
Sci Total Environ. 2018 Mar 15;618:236-242. doi: 10.1016/j.scitotenv.2017.11.047. Epub 2017 Nov 10.
The adsorption behaviour of metals deposited on road surfaces is a complex process and influenced by a range of factors common to the urban environment. However, all factors do not have the same level of importance. It is therefore important to identify the most crucial factors for accurate stormwater quality predictions and to implement effective stormwater pollution mitigation measures. Accordingly, this study investigated the extrinsic and intrinsic factors in terms of their degree of influence on the adsorption of individual metal cations to particulates. The variability associated with the adsorption of Zn, Cu, Pb, Cd, Cr and Ni to road dust was found to be influenced by changes to the antecedent dry days and land use characteristics. The initial dry days after a storm event exerts a significant influence on adsorption compared to the later dry days in all land uses. In terms of the intrinsic physico-chemical properties of road dust, the parameters that influence the adsorption process differ in terms of the type of metal cation and particle size fractions of solids. Based on the influential parameters identified, the bioavailability characteristics of Zn, Cd, Pb and Ni in <150μm size fraction of road dust and potential stormwater quality impacts can be highlighted.
道路表面沉积金属的吸附行为是一个复杂的过程，受到城市环境中一系列共同因素的影响。然而，并非所有因素都具有同等重要性。因此，重要的是要确定对准确预测雨水水质最关键的因素，并实施有效的雨水污染缓解措施。相应地，本研究从外在和内在因素两个方面，就其对单个金属阳离子吸附到颗粒物的影响程度进行了研究。研究发现，Zn、Cu、Pb、Cd、Cr 和 Ni 吸附的可变性受到前干燥天数和土地利用特征变化的影响。与所有土地利用类型的后期干燥天数相比，风暴事件后的初始干燥天数对吸附的影响更大。就道路灰尘的内在物理化学性质而言，影响吸附过程的参数因金属阳离子的类型和固体颗粒大小分数而有所不同。基于确定的影响因素，可以突出<150μm 道路灰尘颗粒大小分数中 Zn、Cd、Pb 和 Ni 的生物利用特性以及潜在的雨水水质影响。
