Full TGIF Record # 78144
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Web URL(s):https://acsess.onlinelibrary.wiley.com/doi/10.2136/sssaj2001.1680
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https://acsess.onlinelibrary.wiley.com/doi/epdf/10.2136/sssaj2001.1680
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Publication Type:
i
Refereed
Author(s):Grafe, M.; Eick, M. J.; Grossl, P. R.
Author Affiliation:Grafe: Department of Plant and Soil Science, College of Agriculture and Natural Resources, University of Delaware, Newark, DE; Eick: Department of Crop and Soil Environmental Sciences, College of Agriculture and Life Sciences, Virginia Tech., Blacksburg, VA; and Grossl: Department of Plants, Soils, and Biometeorology, College of Agriculture, Utah State University, Logan, UT
Title:Adsorption of arsenate (V) and arsenite (III) on goethite in the presence and absence of dissolved organic carbon
Section:Division S-2---Soil chemistry
Other records with the "Division S-2---Soil chemistry" Section
Source:Soil Science Society of America Journal. Vol. 65, No. 6, November/December 2001, p. 1680-1687.
Publishing Information:Madison, WI: Soil Science Society of America
# of Pages:8
Keywords:TIC Keywords: Adsorption; Arsenic; Carbon; Fate; pH; Humic acid; Water quality
Abstract/Contents:"The environmental fate of arsenic (As) is of utmost importance as the public and political debate continues with the USEPA's recent proposal to tighten the As drinking water standard from 50 to 10 μg L-1. In natural systems, the presence of dissolved organic C (DOC) may compete with As for adsorption sites on mineral surfaces, hence increasing its potential bioavailability. Accordingly, the adsorption of arsenate [As (V)] and arsenite [As (III)] on goethite (α-FeOOH) was investigated in the presence of either a peat humic acid (Hap), a Suwannee River Fulvic Acid (FA) (International Humic Substances Society, St. Paul, MN), or citric acid (CA). Adsorption edges and kinetic experiments were used to examine the effects of equimolar concentrations of organic adsorbates on As adsorption. Adsorption edges were conducted across a pH range of 3 to 11, while the kinetic studies were conducted at pH 6.5 for As (V) and pH 5.0 for As (III). Both Hap and FA decreased As (V) adsorption, while CA had no effect. Humic acid reduced As (V) between pH 6 and 9 by ≅ 27%. Fulvic acid inhibited As (V) adsorption between pH 3 and 8 by a maximum of 17%. Arsenite adsorption was decreased by all three organic acids between pH 3 and 8 in the order of CA > FA ≅ Hap. The different pH regions in which Hap and FA decreased As (V) adsorption suggest that more than one functional group on these complex organic polymers may be responsible for binding to the α-FeOOH surface. Similarly, the relative surface affinity of the As (III or V) species and that of the competing organic ligand as a function of pH may play a major role in the outcome of As adsorption on α-FeOOH. The results of these experiments suggest that DOC substances are capable of increasing the bioavailability of As in soil and water systems in which the dominant solid phase is a crystalline iron oxide."
Language:English
References:28
See Also:Other items relating to: Biostimulants
Note:Graphs
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Grafe, M., M. J. Eick, and P. R. Grossl. 2001. Adsorption of arsenate (V) and arsenite (III) on goethite in the presence and absence of dissolved organic carbon. Soil Sci. Soc. Am. J. 65(6):p. 1680-1687.
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https://acsess.onlinelibrary.wiley.com/doi/10.2136/sssaj2001.1680
    Last checked: 02/28/2024
    Access conditions: Item is within a limited-access website
https://acsess.onlinelibrary.wiley.com/doi/epdf/10.2136/sssaj2001.1680
    Last checked: 02/28/2024
    Requires: PDF Reader
    Access conditions: Item is within a limited-access website
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MSU catalog number: S 590 .S65
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