title: Influence of lead in the sorption of arsenate by municipal solid waste composts: metal(loid) retention, desorption and phytotoxicity.
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 (∼0.24mmolg-1MSW-C), but only when Pb(II) was present (0.45mmolL-1). The concomitant sorption of Pb(II) by both MSW-C (∼0.40mmolg-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 (×Triticosecale Wittm.) in the presence of MSW-C.
authors.affiliation: Dipartimento di Agraria, Sezione di Scienze e Tecnologie Ambientali e Alimentari, University of Sassari, Viale Italia 39, 07100 Sassari, Italy.
authors.forename: Margherita
authors.initials: M
authors.lastname: Silvetti
authors.affiliation: Dipartimento di Agraria, Sezione di Scienze e Tecnologie Ambientali e Alimentari, University of Sassari, Viale Italia 39, 07100 Sassari, Italy.
authors.forename: Giovanni
authors.initials: G
authors.lastname: Garau
authors.affiliation: Dipartimento di Agraria, Sezione di Scienze e Tecnologie Ambientali e Alimentari, University of Sassari, Viale Italia 39, 07100 Sassari, Italy.
authors.forename: Daniela
authors.initials: D
authors.lastname: Demurtas
authors.affiliation: Istituto CNR di Scienze delle Produzioni Alimentari, UOS Sassari, Traversa La Crucca 3, Sassari, Italy.
authors.forename: Salvatore
authors.initials: S
authors.lastname: Marceddu
authors.affiliation: Dipartimento di Agraria, Sezione di Scienze e Tecnologie Ambientali e Alimentari, University of Sassari, Viale Italia 39, 07100 Sassari, Italy.
authors.forename: Salvatore
authors.initials: S
authors.lastname: Deiana
authors.affiliation: Dipartimento di Agraria, Sezione di Scienze e Tecnologie Ambientali e Alimentari, University of Sassari, Viale Italia 39, 07100 Sassari, Italy. Electronic address: castaldi@uniss.it.
authors.forename: Paola
authors.initials: P
authors.lastname: Castaldi
mesh_terms: D001149:Arsenates / Q000737:chemistry* / Q000633:toxicity; D005591:Chemical Fractionation / Q000379:methods; D019343:Citric Acid / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D007854:Lead / Q000737:chemistry*; D008293:Malates / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D012037:Refuse Disposal / Q000379:methods*; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000737:chemistry; D062611:Solid Waste; D018675:Toxicity Tests / Q000379:methods; D000066889:Triticale / Q000187:drug effects / Q000254:growth & development
chemical_list: D001149:Arsenates; D008293:Malates; D012987:Soil; D012989:Soil Pollutants; D062611:Solid Waste; D019343:Citric Acid; D007854:Lead; C030298:malic acid; C025657:arsenic acid
keywords: Arsenate; Lead; Municipal solid waste compost; Plant phytotoxicity; Sorption isotherms