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Cited by 476Arsenic contamination and mitigationHeavy metals in environmentGeochemistry and Elemental Analysis

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Mobilization of arsenic by dissolved organic matter from iron oxides, soils and sediments

Bauer, Markus, Blodau, Christian·2006·Science of The Total Environment
DOI 10.1016/j.scitotenv.2005.01.027
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Abstract

The arsenic contamination of aquifers has been linked to the input of dissolved organic matter (DOM). In light of this suggestion, the aim of this study was to quantify chemical effects of DOM on desorption and redox transformations of arsenic bound to synthetic iron oxide and natural samples from different geochemical environments (soils, shallow aquifer, lake sediment). In batch experiments, solutions containing 25-50 mg/L of two different types of DOM (purified peat humic acid and DOM from a peat drainage) were used as extractants in comparison to inorganic solutions. DOM solution was able to mobilize arsenic from all solid phases. Mobilization from iron oxides (maximum: 53.3%) was larger than from natural samples (maximum: 2.9%). The mobilization effect of extractants decreased in the order HCl>NaH2PO4>DOM>NaNO3. DOM solutions, therefore, mainly targeted weakly sorbed arsenic. Mobilization was complete within 24-36 h and DOM was sorbed during incubation indicating competition for sorption sites. The same patterns were observed for different DOM types and concentrations. Addition of DOM lead to (a) enhanced reduction (maximum 7.8%) and oxidation (6.4%) of arsenic in aqueous solution and (b) the appearance of arsenite in aqueous phase of soil samples (5.5%). As the primary mechanism for the arsenic release from solid phases we identified the competition between arsenic and organic anions for sorption sites, whereas redox reactions were probably of minor importance. The resu…

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Metadata

Authors
Bauer, M., & Blodau, C.
Affiliations
University of Bayreuth (DE)
Corresponding author
Bauer, Markus
Venue
Science of The Total Environment
Publisher
Elsevier BV
Published
2006-02
Volume
354
Issue
2-3
Pages
179-190
ISSN
0048-9697 (ISSN-L)
DOI
10.1016/j.scitotenv.2005.01.027
OpenAlex
W2100619860
Cited by
476
References
2
Citations by year
2026: 24 · 2025: 17 · 2024: 22 · 2023: 29 · 2022: 29 · 2021: 26 · 2020: 28 · 2019: 25 · 2018: 27 · 2017: 24 · 2016: 29 · 2015: 22 · 2014: 21 · 2013: 20 · 2012: 17
FWCI
13.13
Type
journal article
Language
en
Open access
closed
Licence
www.elsevier.com/tdm/userlicense/1.0/ (tdm)
Locations
  • The Science of The Total Environment (publishedVersion)
  • PubMed (publishedVersion)
  • ERef Bayreuth (University of Bayreuth) (submittedVersion)
Funders
Bundesministerium für Bildung und Forschung
Topics
  • Physical Sciences › Environmental Science › Environmental Chemistry › Arsenic contamination and mitigation
  • Physical Sciences › Environmental Science › Pollution › Heavy metals in environment
  • Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geochemistry and Elemental Analysis
Keywords
arsenic mobilization, dissolved organic matter, iron oxide, arsenic sorption, arsenic desorption, arsenite, humic acid, peat, groundwater contamination, lake sediments, soil, arsenic speciation
MeSH terms
Adsorption, Arsenates, Arsenic, Humic Substances, Minerals, Oxidation-Reduction, Soil, Soil Pollutants, Arsenites, Geologic Sediments, Iron Compounds

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