An investigation of urban water and sediment ecotoxicity in relation to metal concentrations

Scholes, Lian N. L. and Mensah, R. and Revitt, D. Mike and Jones, Huw (2007) An investigation of urban water and sediment ecotoxicity in relation to metal concentrations. In: Highway and urban environment. Alliance For Global Sustainability Bookseries (12). Springer, pp. 359-370. ISBN 9781402060090

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Abstract

The majority of urban rivers and watercourses routinely receive pollution inputs from a wide variety of sources such as separately sewered stormwater and combined surface water outfalls (CSOs). Although the physico-chemical characteristics of urban runoff have been widely reported, the ecotoxicological impacts of these discharges are less certain. Implemen-tation of the EU Water Framework Directive, with its over-arching aim of protecting, restor-ing and enhancing the ecological status of aquatic ecosystems and its specific reference to the need to control diffuse pollution, has refocused attention on the impact of non-point source discharges on receiving water bodies. However, the implementation of this Directive has also raised several key and complex questions such as how should the ecological status of various water body types be determined. Should the proposed all-encompassing Environmental Qual-ity Standards (EQS) be developed in relation to water, sediment or biotic components? And, once determined, how should compliance with EQS be assessed?

In order to contribute to the current and considerable debate surrounding these issues, the ecotoxicity of urban water and sediments was investigated in relation to concentrations of se-lected heavy metals in these environments. The Microtox test was used to evaluate the eco-toxicity of urban stream water, sediment porewater and water samples produced by resus-pending urban sediments to simulate the impact of storm event conditions. Total concentrations of Zn, Cu and Cd were then determined in these same water fractions, as well as in whole sediment samples. The results of this monitoring programme provide an insight into the metal pathways in urban rivers during different conditions and are interpreted in terms of the usefulness of this approach in contributing to the evaluation of the overall eco-logical status of urban water bodies.

Item Type: Book Section
Research Areas: A. > School of Science and Technology > Natural Sciences
Item ID: 15243
Notes on copyright: Access to full text restricted pending copyright check [Post-print version now included as permitted by publisher 12 months after publication (as indicated in Sherpa/Romeo).]
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Depositing User: Mike Revitt
Date Deposited: 23 Apr 2015 16:46
Last Modified: 13 Oct 2016 14:33
URI: http://eprints.mdx.ac.uk/id/eprint/15243

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