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Arsenate sorption on two chinese red soils evaluated with macroscopic measurements and extended X‐ray absorption fine‐structure spectroscopy
Author(s) -
Luo Lei,
Zhang Shuzhen,
Shan XiaoQuan,
Jiang Wei,
Zhu YongGuan,
Liu Tao,
Xie YaNing,
McLaren Ronald G.
Publication year - 2006
Publication title -
environmental toxicology and chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.1
H-Index - 171
eISSN - 1552-8618
pISSN - 0730-7268
DOI - 10.1897/06-184r.1
Subject(s) - sorption , arsenate , chemistry , soil water , extended x ray absorption fine structure , arsenic , zeta potential , inorganic chemistry , adsorption , ionic strength , absorption (acoustics) , environmental chemistry , aqueous solution , absorption spectroscopy , chemical engineering , materials science , organic chemistry , geology , physics , quantum mechanics , nanoparticle , soil science , engineering , composite material
Arsenic sorption is the primary factor that affects the bioavailability and mobility of arsenic in soils. To elucidate the characteristics and mechanisms of arsenate, As(V), sorption on soils, a combination of sorption isotherms, zeta potential measurements, and extended X‐ray absorption fine‐structure (EXAFS) spectroscopy was used to investigate As(V) sorption on two Chinese red soils. Arsenate sorption increased with increasing As(V) concentration and was insensitive to ionic strength changes at pH 6.0. Arsenate, mainly as H 2 AsO 4 – in soil solution at pH 6.0, was strongly sorbed mainly through ligand exchange by the two soils. The sorption capacity was affected by the iron and aluminum mineral contents in the soils. The zeta potential measurements showed that As(V) sorption lowered the zeta potential and the points of zero charge of the soils. The EXAFS data indicate that adsorbed As(V) forms inner‐sphere complexes with bidentate–binuclear configurations, as evidenced by an As–Fe bond distance of 3.28 ± 0.04 Å and an As–Al bond distance of 3.17 ± 0.03 Å. The two As(V) complexes were stable at different As(V) loadings, whereas the proportions were related to the aluminum and iron mineral contents in the soils. This study illuminated the importance of inclusion of microscopic and macroscopic experiments to elucidate sorption behavior and mechanisms.