Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/7158
AuthorsFloor, G. H.* 
Calabrese, S.* 
Roman-Ross, G.* 
D'Alessandro, W.* 
Aiuppa, A.* 
TitleSelenium mobilization in soils due to volcanic derived acid rain: An example from Mt Etna volcano, Sicily
Issue Date23-Oct-2011
Series/Report no.2/289 (2011)
DOI10.1016/j.chemgeo.2011.08.004
URIhttp://hdl.handle.net/2122/7158
KeywordsSelenium
Volcanic soils
Geogenic
Volcanoes
Contamination
Groundwater
Subject Classification05. General::05.02. Data dissemination::05.02.01. Geochemical data 
05. General::05.08. Risk::05.08.01. Environmental risk 
05. General::05.09. Miscellaneous::05.09.99. General or miscellaneous 
AbstractThe significant amounts of selenium(Se)emitted by volcanoesmay have important impact on human health due to the narrow range between nutrition requirement and toxic effects for living organisms upon Se exposure. Although soils play a key role in determining the level in food and water and thereby human health, little is known about the behaviour of Se in volcanic soils. In this work we evaluated the Se release during rainwater–soil interaction under controlled conditions using soils collected on the flanks of Etna volcano and synthetic rain. Seleniumconcentrations in soil leachate solutions displayed a spatial distribution, which cannot be explained by plume deposition, total Se soil concentrations or the presence of Fe oxides. Instead, Al compounds and to a minor extent SOM were identified as the active phases controlling the selenate mobilization during interaction with sulphate-containing rainwater. This shows the importance of soils as reactive interfaces. Selenium is mobilized when volcanic-derived acid rain interacts with poorly developed soils close to the crater. This geogenic process might influence the chemical composition of groundwater and as a result, human health.
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