Metal forms and dynamics in urban stormwater runoff: new insights from diffusive gradients in thin-films (DGT) measurements

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dc.contributor.authorMcDonald, Sen_AU
dc.contributor.authorHolland, Aen_AU
dc.contributor.authorSimpson, SLen_AU
dc.contributor.authorGadd, JBen_AU
dc.contributor.authorBennett, WWen_AU
dc.contributor.authorWalker, GWen_AU
dc.contributor.authorKeough, MJen_AU
dc.contributor.authorCresswell, Ten_AU
dc.contributor.authorHassell, KLen_AU
dc.date.accessioned2022-05-05T03:27:16Zen_AU
dc.date.available2022-05-05T03:27:16Zen_AU
dc.date.issued2022-02-01en_AU
dc.date.statistics2022-04-14en_AU
dc.descriptionThe citation on the Elsevier page at https://doi.org/10.1016/j.watres.2021.117967 shows the author T. Cresswell as T. Cresswel, which is incorrect.en_AU
dc.description.abstractStormwater runoff typically contains significant quantities of metal contaminants that enter urban waterways over short durations and represent a potential risk to water quality. The origin of metals within the catchment and processes that occur over the storm can control the partitioning of metals between a range of different forms. Understanding the fraction of metals present in a form that is potentially bioavailable to aquatic organisms is useful for environmental risk assessment. To help provide this information, the forms and dynamics of metal contaminants in an urban system were assessed across a storm. Temporal patterns in the concentration of metals in dissolved and particulate (total suspended solids; TSS) forms were assessed from water samples, and diffusive gradients in thin-films (DGTs) were deployed to measure the DGT-labile time-integrated metal concentration. Results indicate that the concentrations of dissolved and TSS-associated metals increased during the storm, with the metals Al, Cd, Co, Cu, Pb and Zn representing the greatest concern relative to water quality guideline values (GVs). The portion of labile metal as measured by DGT devices indicated that during the storm a substantial fraction (∼98%) of metals were complexed and pose a lower risk of acute toxicity to aquatic organisms. Comparison of DGT results to GVs indicate that current GVs are likely quite conservative when assessing stormwater pollution risks with regards to metal contaminants. This study provides valuable insight into the forms and dynamics of metals in an urban system receiving stormwater inputs and assists with the development of improved approaches for the assessment of short-term, intermittent discharge events. © 2021 Elsevier Ltd.en_AU
dc.description.sponsorshipThis study was carried out with the assistance of an Australian Institute of Nuclear Science and Engineering (AINSE) Post-Graduate Research Award, a Holsworth Wildlife Research Endowment Award from the Ecological Society of Australia and an Albert Shimmins Postgraduate Writing-Up Award (University of Melbourne), all awarded to S. McDonald.en_AU
dc.identifier.articlenumber117967en_AU
dc.identifier.citationMcDonald, S., Holland, A., Simpson, S. L., Gadd, J. B., Bennett, W. W., Walker, G. W., Keough, M. J., Cresswel, T. & Hassell, K. L. (2022). Metal forms and dynamics in urban stormwater runoff: new insights from diffusive gradients in thin-films (DGT) measurements. Water Research, 209, 117967. doi:10.1016/j.watres.2021.117967en_AU
dc.identifier.issn0043-1354en_AU
dc.identifier.journaltitleWater Researchen_AU
dc.identifier.urihttps://doi.org/10.1016/j.watres.2021.117967en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/13117en_AU
dc.identifier.volume209en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectOrganic matteren_AU
dc.subjectWater qualityen_AU
dc.subjectMetalsen_AU
dc.subjectDynamicsen_AU
dc.subjectRunoffen_AU
dc.subjectRain wateren_AU
dc.subjectThin filmsen_AU
dc.titleMetal forms and dynamics in urban stormwater runoff: new insights from diffusive gradients in thin-films (DGT) measurementsen_AU
dc.typeJournal Articleen_AU
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