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Accumulation and mobilization of arsenate by Fe(III) polyions trapped in a Ca-polygalacturonate network

Deiana, Salvatore Andrea and Deiana, Luca and Premoli, Alessandra Maria and Senette, Caterina (2009) Accumulation and mobilization of arsenate by Fe(III) polyions trapped in a Ca-polygalacturonate network. Plant Physiology and Biochemistry, Vol. 47 (7), p. 615-622. ISSN 0981-9428. Article.

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DOI: 10.1016/j.plaphy.2009.02.004

Abstract

The role of Fe(III) stored at the soil–root interface in the accumulation of arsenate and the influence of citric acid on the As(V) mobility were investigated by using Ca-polygalacturonate networks (PGA). The results indicate that in the 2.5–6.2 pH range Fe(III) interacts with As(V) leading to the sorption of As(V) on Fe(III) precipitates or Fe–As coprecipitates. The FT-IR analysis of these precipitates evidenced that the interaction produces Fe(III)–As(V) inner-sphere complexes with either monodentate or bidentate binuclear attachment of As(V) depending on pH.
In the 3.0–6.0 pH range, As(V) diffuses freely through the polysaccharidic matrix that was found to exert a negligible reducing action towards As(V). At pH 6.0 citric acid is able to mobilize arsenate from the As–Fe–PGA network through the complexation of the Fe(III) polyions that leads to the release of As(V).

Item Type:Article
ID Code:3006
Status:Published
Refereed:Yes
Uncontrolled Keywords:Arsenate, iron, polygalacturonic acid, citric acid, soil–root interface
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/13 Chimica agraria
Area 05 - Scienze biologiche > BIO/12 Biochimica clinica e biologia molecolare clinica
Divisions:001 Università di Sassari > 01 Dipartimenti > Chimica
001 Università di Sassari > 01 Dipartimenti > Scienze ambientali agrarie e biotecnologie agro-alimentari
Publisher:Elsevier Masson
ISSN:0981-9428
Deposited On:29 Oct 2009 08:49

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