Effects of Fulvic and Humic Acids on Arsenate Adsorption to Goethite: Experiments and Modeling

• Published in: Environmental science & technology Vol. 43; no. 19; pp. 7198 - 7204
• Main Authors: Weng, Liping, Van Riemsdijk, Willem H, Hiemstra, Tjisse
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 01.10.2009
• Subjects: Adsorption; Applied sciences; Arsenates - chemistry; Benzopyrans - chemistry; binding; charge-distribution; Chemistry Techniques, Analytical; competition; Environmental Monitoring; Exact sciences and technology; Humic Substances; ion adsorption; Iron Compounds - chemistry; iron-oxides; Minerals; Models, Chemical; natural organic-matter; Pollution; speciation; surface structural approach; water interface; Chemical reduction; Trace element; Organic matter; Adsorption; Arsenic; Arsenates; Pollutant behavior; Ionic strength; Desorption; Modeling; Speciation; Arsenites

Data for interactions between arsenate (AsO4 3−) and fulvic acids (FA) or humic acids (HA) at the surface of goethite are presented (pH 3−7, ionic strength 2 mM and 10 mM). Adsorption of FA and HA leads to desorption of arsenate and a correspondingly strong increase of arsenic concentration in solut...