Lanthanoid behaviour in an acidic landscape

Effect of weathering on abundance and release of potentially toxic elements in soils developed on Lower Cambrian black shales, P. R. China

“…The two soil types thus have different direct origins and sulfur sources, but like the black shale soils, the acid sulfate soils have a chemistry dominated by sulfide oxidation, metal release, and acidification (Å ström 1998; Burton et al 2006a) and thus behave, in an environmental context, in a manner similar to the black shale soils (Macdonald et al 2007;Burton et al 2006b;Fältmarsch et al 2008Fältmarsch et al , 2009Boman et al 2010). Because both soil types are characterized by high contents of easily mobilized metals, the soil layers and downstream waters are all characterized by acidification and metal loadings (Å ström and Björklund 1995;Nordmyr et al 2008;Å ström et al 2010). Of particular concern are Cd and Cu, which are highly toxic metals extensively mobilized in acid sulfate soils (Sundström et al 2002) and, as shown in this and other previous black shaleoriented studies, enriched in (and leached from) black Fig.…”

Sulfur biogeochemical cycling and novel Fe–S mineralization pathways in a tidally re-flooded wetland

“…Discharge of acidic, metal-rich waters from CLASS can have severe and long lasting consequences for the environmental quality of affected systems (Å strö m and Spiro, 2000;Macdonald et al, 2004Macdonald et al, , 2007Ö sterholm and Å strö m, 2008;Hicks et al, 2009;Å strö m et al, 2010). Remediation approaches have traditionally focused on treatment of existing soil and water acidity by amendment with neutralizing agents, such as lime (Tulau, 2002;Green et al, 2006;Å strö m et al, 2007).…”

Characterization of acid sulfate soils and assessing their impact on a humic boreal lake

“…Particularly during high water flow conditions, acidic pore water rich in metals, e.g. Al, Cd, Co, La, Mn, Ni and Zn, is flushed to recipient streams (Åström andBjörklund, 1995a, 1995b;Åström et al, 2010;Haraguchi, 2007;Macdonald et al, 2007;Palko et al, 1985;Weppling, 1993), causing large ecological damage (Hudd et al, 1984;Willett et al, 1993). Most of the released metals are precipitated at river estuaries (Macdonald et al, 2004;Nordmyr et al, 2008).…”