The ability of two municipal solid waste composts (MSW-C) to sorb As(V) in the presence of Pb(II) and in acidic conditions was investigated. Sorption isotherms and kinetics showed that both MSW-C were able to sorb As(V) in a similar way (similar to 0.24 mmol g(-1) MSW-C), but only when Pb(II) was present (0.45 mmol L-1). The concomitant sorption of Pb(II) by both MSW-C (similar to 0.40 mmol g(-1)) suggested that the metal cation was likely acting as bridging element between the negatively charged functional groups of composts and As(V). SEM-EDX analysis of the MSW-C + Pb(II) + As(V) systems supported the association between Pb(II) and As(V), while sequential extraction procedures and organic acids treatment showed that As(V) was strongly retained by MSW-C + Pb(II) and suggested the presence of different interaction types between As(V) and Pb(II). Plant growth experiments highlighted the key role of Pb(II) in the reduction of As(V)-phytotoxicity for triticale plants (x Triticosecale Wittm.) in the presence of MSW-C.

Influence of lead in the sorption of arsenate by municipal solid waste composts: metal(loid) retention, desorption and phytotoxicity / Silvetti, Margherita; Garau, Giovanni; Demurtas, Daniela; Marceddu, S.; Deiana, Salvatore Andrea; Castaldi, Paola. - In: BIORESOURCE TECHNOLOGY. - ISSN 0960-8524. - 225:(2017), pp. 90-98. [10.1016/j.biortech.2016.11.057]

Influence of lead in the sorption of arsenate by municipal solid waste composts: metal(loid) retention, desorption and phytotoxicity

SILVETTI, Margherita
Investigation
;
GARAU, Giovanni
Writing – Original Draft Preparation
;
DEMURTAS, Daniela
Formal Analysis
;
DEIANA, Salvatore Andrea
Supervision
;
CASTALDI, Paola
Writing – Review & Editing
2017

Abstract

The ability of two municipal solid waste composts (MSW-C) to sorb As(V) in the presence of Pb(II) and in acidic conditions was investigated. Sorption isotherms and kinetics showed that both MSW-C were able to sorb As(V) in a similar way (similar to 0.24 mmol g(-1) MSW-C), but only when Pb(II) was present (0.45 mmol L-1). The concomitant sorption of Pb(II) by both MSW-C (similar to 0.40 mmol g(-1)) suggested that the metal cation was likely acting as bridging element between the negatively charged functional groups of composts and As(V). SEM-EDX analysis of the MSW-C + Pb(II) + As(V) systems supported the association between Pb(II) and As(V), while sequential extraction procedures and organic acids treatment showed that As(V) was strongly retained by MSW-C + Pb(II) and suggested the presence of different interaction types between As(V) and Pb(II). Plant growth experiments highlighted the key role of Pb(II) in the reduction of As(V)-phytotoxicity for triticale plants (x Triticosecale Wittm.) in the presence of MSW-C.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11388/175315
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