Metal size distribution in rainfall and snowmelt-induced runoff from three urban catchments

Lindfors, Sarah ORCID logoORCID: https://orcid.org/0000-0001-8321-1847, Österlund, Heléne ORCID logoORCID: https://orcid.org/0000-0002-4732-7348, Lundy, Lian ORCID logoORCID: https://orcid.org/0000-0003-1155-4132 and Viklander, Maria (2020) Metal size distribution in rainfall and snowmelt-induced runoff from three urban catchments. Science of The Total Environment, 743 . p. 140813. ISSN 0048-9697 [Article] (doi:10.1016/j.scitotenv.2020.140813)

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Abstract

The size distribution of metals transported by urban runoff has implications for treatment type and design, predicting their mobility and evaluating their potential impact on receiving waters. There is an urgent need to better understand the distribution of metals between fractions, particularly those in the sub-dissolved fractions. As a contribution to addressing this need, this study characterises the size distribution of Cd, Cr, Cu, Ni, V and Zn using conventional and novel techniques. Data is presented as event mean concentrations (EMC) of a total of 18 rainfall and snowmelt events at three urban sites. For all studied metals in all events and at all sites, the contribution of the truly dissolved fraction made a greater contribution to the total concentrations than the colloidal fraction. Truly dissolved Cd and Zn concentrations contributed (on average) 26% and 28% respectively, of the total EMCs with truly dissolved Cu and Ni contributing (on average) 18%. In contrast, only 1% (V) and 3% (Cr) were identified in the truly dissolved fraction. The greatest contribution of truly dissolved Cd, Cu and Zn concentrations (relative to total oncentrations) were reported during rainfall events. However, no seasonal differences were identified and differences between the sites regarding the EMCs distribution by fractions were not at a statistically significant level (p N 0.05) for any metal or event. The loads of truly dissolved and colloidal metals did not follow the patterns of particulate metal loads indicating particulates are not the main source of subdissolved metals. The data suggests that ultrafiltration as a treatment technique would not efficiently mitigate the risks posed by metals to receiving water cologies

Item Type: Article
Keywords (uncontrolled): Urban runoff, Size fractionation, Dissolved metals, Truly dissolved, Colloids, Ultrafiltration
Research Areas: A. > School of Science and Technology > Natural Sciences
Item ID: 33018
Notes on copyright: © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
Useful Links:
Depositing User: Lian Lundy
Date Deposited: 26 Apr 2021 09:11
Last Modified: 26 Apr 2021 09:11
URI: https://eprints.mdx.ac.uk/id/eprint/33018

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