Changes on chemical fractions of heavy metals in Chilean soils amended with sewage sludge affected by a thermal impact

Antilen, M; Araya, N; Briceño M.; Escudey, M.

Abstract

Forest fires are frequent in central-southern Chile; high temperatures may affect chemical fractions of heavy metals (Cu, Zn, Ni, Pb, Cd, Mo, Cr, and Mn) naturally present in soils and those coming from sewage sludge amendment. Changes in exchangeable, sorbed, organic, carbonate, and residual heavy metals fractions, evaluated by sequential extraction, were observed after heating at 400°C in 2 amended volcanic soils. Most significant heavy metals in these samples were Cu, Zn, Pb, and Ni. A significant increment in the total content of organic matter and metal ions, such as Zn and Cu, was observed in amended soils with respect to controls. In all samples, sorbed and exchangeable forms represent <10% of the total amount, while organic and carbonate fractions represent 24 and 48%, respectively. The thermal treatment of amended soil samples results in a redistribution of the organic fraction, mainly into more insoluble carbonate and residual fractions such as oxides. Finally, the thermal impact is much more important on sewage sludge amended soils if a heavy metal remediation process is considered, reducing the mobility and solubility of heavy metals supported by sewage sludge, minimising leaching and promoting accumulations in surface horizons. © CSIRO 2006.

Más información

Título según WOS: Changes on chemical fractions of heavy metals in Chilean soils amended with sewage sludge affected by a thermal impact
Título según SCOPUS: Changes on chemical fractions of heavy metals in Chilean soils amended with sewage sludge affected by a thermal impact
Título de la Revista: AUSTRALIAN JOURNAL OF SOIL RESEARCH
Volumen: 44
Número: 6
Editorial: PERGAMON-ELSEVIER SCIENCE LTD
Fecha de publicación: 2006
Página de inicio: 619
Página final: 625
Idioma: English
URL: http://www.publish.csiro.au/?paper=SR06063
DOI:

10.1071/SR06063

Notas: ISI, SCOPUS