MEDEA

Advanced Methodologies for the Determination of the Lability of Trace Metals and Their Application to Contaminated Soils

Coordinatore	NATURAL ENVIRONMENT RESEARCH COUNCIL    more  Organization address address: Polaris House, North Star Avenue city: SWINDON WILTSHIRE postcode: SN2 1EU contact info Titolo: Ms. Nome: Lynne Cognome: Riley Email: send email Telefono: +44 (0)115 936 3202 Fax: +44 (0)115 936 3370
Nazionalità Coordinatore	United Kingdom [UK]
Sito del progetto	http://www.gold.ac.uk/medea/
Totale costo	172˙740 €
EC contributo	172˙740 €
Programma	FP7-PEOPLE Specific programme "People" implementing the Seventh Framework Programme of the European Community for research, technological development and demonstration activities (2007 to 2013)
Code Call	FP7-PEOPLE-2009-IEF
Funding Scheme	MC-IEF
Anno di inizio	2010
Periodo (anno-mese-giorno)	2010-09-01   -   2012-08-31

 Partecipanti

#	participant	country	role	EC contrib. [€]
1	NATURAL ENVIRONMENT RESEARCH COUNCIL  Organization address address: Polaris House, North Star Avenue city: SWINDON WILTSHIRE postcode: SN2 1EU contact info Titolo: Ms. Nome: Lynne Cognome: Riley Email: send email Telefono: +44 (0)115 936 3202 Fax: +44 (0)115 936 3370	UK (SWINDON WILTSHIRE)	coordinator	172˙740.80

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 Obiettivo del progetto (Objective)

'Much of Western Europe has inherited soil contaminated with heavy metals from past mining, mineral processing and industrial activities. When performing risk assessment for eco-toxicological, human health or ground water vulnerability studies the major issue is not the total concentration of the heavy metal but its labile fraction i.e. the proportion of the metal transferable to an aqueous phase in ionic form. This may vary widely as a function of the solid forms in which the metal is hosted, the pH and redox conditions in pore waters that control the lability, or the occurrence of other species within the aqueous phase which may provide competitive sorption or preferential transport modes. Given the toxicity of a number of heavy metals even at low contents, accurate methods are required to properly monitor them in the environment and gain further insight in their behaviour. Simple extraction schemes are the most common procedure to assess natural availability of heavy metals in different scenarios. However, it has been demonstrated that these are unable to measure the true proportion of metal that may be exchangeable and contribute to lability, which may lead to unreliable risk assessments. This proposal seeks to accurately study the lability of heavy metals in several polluted scenarios by applying one of the most advanced methodologies for this purpose, namely ‘isotope dilution’ (ID). This technique reflects the pool of reactive metal in the soil and can be used to model solid-solution equilibria and the fixation of metal ions into less available forms. ID method has been successfully implemented for Cd, Zn and As, while a method for environmentally significant elements such as Fe, Sb and Se -particularly susceptible to redox conditions- remains to be developed. Data will be combined with soil pore water analyses to geochemically model scenarios and determine the role of changing redox conditions in the releases of heavy metals to the environment.'

Introduzione (Teaser)

Significant areas of soil in western Europe are contaminated with heavy metals from previous mining, mineral processing and industrial activities. Scientists have exploited advanced technology to more accurately assess risks.