Metal transport and remobilisation in a basin affected by acid mine drainage: the role of ochreous amorphous precipitates

Environmental Science and Pollution Research International
S ConsaniGabriella Lucchetti

Abstract

Metal-polluted mine waters represent a major threat to the quality of waters and sediments in a downstream basin. At the confluence between acidic mine waters and the unpolluted waters of the Gromolo Torrent (Liguria, North-West Italy), the massive formation of an ochreous amorphous precipitate takes place. This precipitate forms a soft blanket that covers the torrent bed and can be observed down to its mouth in the sea. The aim of this work is to evaluate the dispersion of metals in the Gromolo Torrent basin from the abandoned Cu-Fe sulphide mine of Libiola to the Ligurian Sea and to assess the metal remobilisation from the amorphous precipitates. The mineralogy of the superficial sediments collected in the torrent bed and the concentrations of different elements of environmental concern (Cu, Zn, Cd, Co, Cr, Mn, Ni, Pb, As, and Sb) were therefore analysed. The results showed that the precipitates contain high concentration of Fe, Al, Cu, and Zn, significantly modifying the bulk chemistry of the Gromolo Torrent sediments. In order to evaluate the possible remobilisation of ecotoxic elements from the amorphous precipitates, bulk leaching tests were performed with both deionised and seawater. Bulk leaching tests with deionised wa...Continue Reading

References

Feb 28, 2004·Chemosphere·José MorilloIgnacio Gracia
Apr 4, 1986·Science·D K Nordstrom, J W Ball
Feb 9, 2010·Environmental Monitoring and Assessment·Ondra SracekFrantišek Veselovský
Oct 16, 2013·Environmental Science and Pollution Research International·Emmanuelle Montarges-PelletierLaurent J Michot

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Citations

Aug 16, 2018·Environmental Science and Pollution Research International·Ondra SracekImasiku Nyambe
Mar 15, 2020·Environmental Monitoring and Assessment·Emilli FrachiniMaria Josefa Santos

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