Extraction and characterization of ternary complexes between natural organic matter, cations, and oxyanions from a natural soil

Natural organic matter (NOM) can have a significant influence on the mobility and fate of inorganic oxyanions, such as arsenic and selenium, in the environment. There is evidence to suggest that interactions between NOM and these oxyanions are facilitated by bridging cations (primarily Fe3+) through...

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Bibliographic Details
Published in:Chemosphere (Oxford) 2017-06, Vol.176, p.125-130
Main Authors: Peel, Hannah R., Martin, David P., Bednar, Anthony J.
Format: Article
Language:English
Subjects:
Anions - chemistry
Arsenic
Arsenic - chemistry
Arsenic - isolation & purification
Cations - chemistry
Coordination Complexes - analysis
Coordination Complexes - isolation & purification
Environment
Humic Substances
Hydrogen-Ion Concentration
Macromolecular Substances - chemistry
Macromolecular Substances - isolation & purification
Natural organic matter
Organic Chemicals - chemistry
SEC-ICP-MS
Selenium
Selenium - chemistry
Selenium - isolation & purification
Soil - chemistry
Ternary complexes
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Summary:Natural organic matter (NOM) can have a significant influence on the mobility and fate of inorganic oxyanions, such as arsenic and selenium, in the environment. There is evidence to suggest that interactions between NOM and these oxyanions are facilitated by bridging cations (primarily Fe3+) through the formation of ternary complexes. Building on previous work characterizing ternary complexes formed in the laboratory using purified NOM, this study describes the extraction and characterization of intact ternary complexes directly from a soil matrix. The complexes are stable to the basic extraction conditions (pH 12) and do not appear to change when the pH of the extract is adjusted back to neutral. The results suggest that ternary complexes between NOM, cations, and inorganic oxyanions exist in natural soils and could play a role in the speciation of inorganic oxyanions in environmental matrices. [Display omitted] •Humic acid from a natural soil and its ternary complexes were characterized by SEC-ICP-MS.•Intact ternary complexes were extracted directly from the soil and characterized.•Complexes in the soil extract were similar to those of the purified humic acid.•The amount of As observed bound in these complexes is relatively small but merits further study.
ISSN:0045-6535
1879-1298
DOI:10.1016/j.chemosphere.2017.02.101