DOI: 10.2136/sssaj2001.1680. Adsorption of Arsenate (V) and Arsenite (III) on Goethite in the Presence and Absence of Dissolved Organic Carbon

Adsorption of Arsenate (V) and Arsenite (III) on Goethite in the Presence and Absence of Dissolved Organic Carbon

10.2136/sssaj2001.1680

Crossref journal-article

Wiley

Soil Science Society of America Journal (311)

Abstract

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.

Bibliography

Grafe, M., Eick, M. J., & Grossl, P. R. (2001). Adsorption of Arsenate (V) and Arsenite (III) on Goethite in the Presence and Absence of Dissolved Organic Carbon. Soil Science Society of America Journal, 65(6), 1680â1687. Portico.

Authors 3

M. Grafe (first)
M. J. Eick (additional)
P. R. Grossl (additional)

References 28 Referenced 298

10.1021/es980541c
10.1006/jcis.1999.6184
10.1021/es950653t
10.1016/S0016-7037(99)00176-3
10.2136/sssaj1992.03615995005600030050x
10.1021/es970908y
10.1021/es950654l
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10.1111/j.1365-2389.1997.tb00550.x
10.1346/CCMN.1996.0440504
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10.1021/es00020a008 / Environ. Sci. Technol. / Effect of redox potential and pH on arsenic speciation and solubility in a contaminated soil by Massecheleyn P.H. (1991)
10.2136/sssaj1994.03615995005800020012x
10.1007/BF00197194 / Bull. Environ. Contam. Toxicol. / Arsenic contamination levels in water, soils, and sludges in Southeast Spain by Navarro M. (1993)
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{'key': 'e_1_2_7_20_1', 'volume-title': 'Iron oxides in the laboratory: preparation and characterization', 'author': 'Schwertmann U.', 'year': '1991'} / Iron oxides in the laboratory: preparation and characterization by Schwertmann U. (1991)
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10.1007/978-1-4612-2864-6_4 / Reviews of environmental contamination and toxicology by Tamaki S. (1992)
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10.1007/BF00163734 / Water Air Soil Pollut. / Influence of pH and organic substance on the adsorption of As (V) on geological materials by Xu H. (1988)
{'key': 'e_1_2_7_29_1', 'first-page': '764', 'article-title': 'Functional group analysis of Suwannee river fulvic acid with reactive fluorescent probes', 'volume': '364', 'author': 'Yates L.M.', 'year': '1999', 'journal-title': "Fresenius' J. Anal. Chem."} / Fresenius' J. Anal. Chem. / Functional group analysis of Suwannee river fulvic acid with reactive fluorescent probes by Yates L.M. (1999)

Dates

Type	When
Created	15 years, 1 month ago (July 27, 2010, 7:55 p.m.)
Deposited	1 year, 11 months ago (Sept. 8, 2023, 10:17 p.m.)
Indexed	1 week, 2 days ago (Aug. 23, 2025, 1:06 a.m.)
Issued	23 years, 10 months ago (Nov. 1, 2001)
Published	23 years, 10 months ago (Nov. 1, 2001)
Published Online	23 years, 10 months ago (Nov. 1, 2001)
Published Print	23 years, 10 months ago (Nov. 1, 2001)

Funders 0

None

BibTeX

@article{Grafe_2001, title={Adsorption of Arsenate (V) and Arsenite (III) on Goethite in the Presence and Absence of Dissolved Organic Carbon}, volume={65}, ISSN={1435-0661}, url={http://dx.doi.org/10.2136/sssaj2001.1680}, DOI={10.2136/sssaj2001.1680}, number={6}, journal={Soil Science Society of America Journal}, publisher={Wiley}, author={Grafe, M. and Eick, M. J. and Grossl, P. R.}, year={2001}, month=nov, pages={1680–1687} }

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  "abstract": "<jats:p>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 \u03bcg L<jats:sup>\u22121</jats:sup> 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 (\u03b1\u2010FeOOH) 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 \u224827%. 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 &gt; FA \u2248 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 \u03b1\u2010FeOOH 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 \u03b1\u2010FeOOH. 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.</jats:p>",
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