Effect of biosolid incorporation on arsenic distribution in Mollisol soils in central Chile

Ascar, L.; Ahumada, I.; Richter, P

Abstract

The effect of biosolid incorporation on arsenic distribution in Mollisol soils in central Chile was studied. Two soils were sequentially extracted for arsenic with a five-step method that accounts for the following arsenic forms: non-specifically adsorbed (F1), specifically adsorbed (F2), amorphous and poorly crystallized Fe and Al oxides (F3), well-crystallized Fe and Al oxides (F4) and residual (F5). The arsenic residual fraction was predominant in Pintué soil, whereas in Graneros soil, arsenic was mostly associated to amorphous Fe and Al oxides. Graneros soil exhibited a higher As(V) adsorbing capacity than Pintué soil, which relates to the higher clay and iron and aluminum oxides contents, confirming that these components participation is essential for the adsorption of this metalloid. Biosolid application at a rate of 100 Mg ha-1 caused an increase in arsenic bound to amorphous Fe and Al oxides and in the residual fraction, in Pintué soil. When Pintué soil was spiked with arsenic, aged for two months, and treated with biosolid (100 Mg ha-1), the content of arsenic in the most labile fractions decreased, thus showing a favorable effect in its application to soils with few specific sites for arsenic adsorption. Arsenic speciation was carried out in the first two fractions of the sequential extraction procedure. As(V) was the main form in both fractions. Biosolid incorporation at a rate of 100 Mg ha-1 caused a significant increase in organic arsenic forms. © 2007 Elsevier Ltd. All rights reserved.

Más información

Título según WOS: Effect of biosolid incorporation on arsenic distribution in Mollisol soils in central Chile
Título según SCOPUS: Effect of biosolid incorporation on arsenic distribution in Mollisol soils in central Chile
Título de la Revista: CHEMOSPHERE
Volumen: 70
Número: 7
Editorial: PERGAMON-ELSEVIER SCIENCE LTD
Fecha de publicación: 2008
Página de inicio: 1211
Página final: 1217
Idioma: English
URL: http://linkinghub.elsevier.com/retrieve/pii/S004565350701034X
DOI:

10.1016/j.chemosphere.2007.08.012

Notas: ISI, SCOPUS