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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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.
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