Silicic acid competes for dimethylarsinic acid (DMA) immobilization by the iron hydroxide plaque mineral goethite

Publikationstyp:
Zeitschriftenaufsatz
Metadaten:
Autoren
Sammlungen
  • metadata
ISSN
1879-1026
Zeitschrift
Science of the total environment
Schlüsselwörter
  • 550 Geowissenschaften
  • 550 Earth sciences
Sprache
eng
Paginierung
Seiten: 199 - 205
Datum der Veröffentlichung
2015
Herausgeber
Elsevier
Herausgeber URL
http://dx.doi.org/10.1016/j.scitotenv.2014.11.093
Datum der Datenerfassung
2020
Datum, an dem der Datensatz öffentlich gemacht wurde
2020
Zugang
Public
Titel
Silicic acid competes for dimethylarsinic acid (DMA) immobilization by the iron hydroxide plaque mineral goethite
Ausgabe der Zeitschrift
508

Datenquelle: METADATA.UB

Andere Metadatenquellen:
Autoren
Autoren-URL
https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=fis-test-1&SrcAuth=WosAPI&KeyUT=WOS:000349195100024&DestLinkType=FullRecord&DestApp=WOS_CPL
DOI
10.1016/j.scitotenv.2014.11.093
eISSN
1879-1026
Externe Identifier
  • Clarivate Analytics Document Solution ID: CA8TZ
  • PubMed Identifier: 25478657
ISSN
0048-9697
Zeitschrift
SCIENCE OF THE TOTAL ENVIRONMENT
Schlüsselwörter
  • DMA
  • Arsenic
  • Rice
  • Paddy soil
  • Adsorption
  • Goethite
  • Plaques
  • CD-MUSIC
Paginierung
199 - 205
Datum der Veröffentlichung
2015
Status
Published
Titel
Silicic acid competes for dimethylarsinic acid (DMA) immobilization by the iron hydroxide plaque mineral goethite
Sub types
  • Article
Ausgabe der Zeitschrift
508

Datenquelle: Web of Science (Lite)

Autoren
DOI
10.1016/j.scitotenv.2014.11.093
ISSN
0048-9697
Zeitschrift
Science of The Total Environment
Sprache
en
Paginierung
199 - 205
Datum der Veröffentlichung
2015
Status
Published
Herausgeber
Elsevier BV
Herausgeber URL
http://dx.doi.org/10.1016/j.scitotenv.2014.11.093
Datum der Datenerfassung
2019
Titel
Silicic acid competes for dimethylarsinic acid (DMA) immobilization by the iron hydroxide plaque mineral goethite
Ausgabe der Zeitschrift
508

Datenquelle: Crossref

Abstract
A surface complexation modeling approach was used to extend the knowledge about processes that affect the availability of dimethylarsinic acid (DMA) in the soil rhizosphere in presence of a strong sorbent, e.g., Fe plaques on rice roots. Published spectroscopic and molecular modeling information suggest for the organoarsenical agent to form bidentate-binuclear inner-sphere surface complexes with Fe hydroxides similar to the inorganic As oxyanions. However, since also the ubiquitous silicic acid oxyanion form the same bidentate binuclear surface complexes, our hypothesis was that it may have an effect on the adsorption of DMA by Fe hydroxides in soil. Our experimental batch equilibrium data show that DMA is strongly adsorbed in the acidic pH range, with a steep adsorption edge in the circumneutral pH region between the DMA acidity constant (pKa=6.3) and the point of zero charge value of the goethite adsorbent (pHpzc=8.6). A 1-pK CD-MUSIC surface complexation model was chosen to fit the experimental adsorption vs. pH data. The same was done for silicic acid batch equilibrium data with our goethite adsorbent. Both model parameters for individual DMA and silicic acid adsorption were then merged into one CD-MUSIC model to predict the binary DMA+Si adsorption behavior. Silicic acid (500 μM) was thus predicted by the model to strongly compete for DMA with up to 60% mobilization of the latter at a pH6. This model result could be verified subsequently by experimental batch equilibrium data with zero adjustable parameters. The thus quantified antagonistic relation between DMA and silicic acid is discussed as one of factors to explain the increase of the DMA proportion in rice grains as observed upon silica fertilization of rice fields.
Addresses
  • Geosciences Institute, Johannes Gutenberg-University, Mainz 55099, Germany.
Autoren
DOI
10.1016/j.scitotenv.2014.11.093
eISSN
1879-1026
Externe Identifier
  • PubMed Identifier: 25478657
Funding acknowledgements
  • German Geotechnology Research Program “Mineral Surfaces”: 03G0710
  • German Science Foundation Priority Research Program SPP 1315 “Biogeochemical Interfaces in Soil”: KE 508/19
Open access
false
ISSN
0048-9697
Zeitschrift
The Science of the total environment
Schlüsselwörter
  • Silicic Acid
  • Iron Compounds
  • Minerals
  • Cacodylic Acid
  • Adsorption
  • Surface Properties
  • Models, Molecular
Sprache
eng
Medium
Print-Electronic
Online publication date
2014
Paginierung
199 - 205
Datum der Veröffentlichung
2015
Status
Published
Datum der Datenerfassung
2014
Titel
Silicic acid competes for dimethylarsinic acid (DMA) immobilization by the iron hydroxide plaque mineral goethite.
Sub types
  • Research Support, Non-U.S. Gov't
  • Journal Article
Ausgabe der Zeitschrift
508

Datenquelle: Europe PubMed Central

Abstract
A surface complexation modeling approach was used to extend the knowledge about processes that affect the availability of dimethylarsinic acid (DMA) in the soil rhizosphere in presence of a strong sorbent, e.g., Fe plaques on rice roots. Published spectroscopic and molecular modeling information suggest for the organoarsenical agent to form bidentate-binuclear inner-sphere surface complexes with Fe hydroxides similar to the inorganic As oxyanions. However, since also the ubiquitous silicic acid oxyanion form the same bidentate binuclear surface complexes, our hypothesis was that it may have an effect on the adsorption of DMA by Fe hydroxides in soil. Our experimental batch equilibrium data show that DMA is strongly adsorbed in the acidic pH range, with a steep adsorption edge in the circumneutral pH region between the DMA acidity constant (pKa=6.3) and the point of zero charge value of the goethite adsorbent (pHpzc=8.6). A 1-pK CD-MUSIC surface complexation model was chosen to fit the experimental adsorption vs. pH data. The same was done for silicic acid batch equilibrium data with our goethite adsorbent. Both model parameters for individual DMA and silicic acid adsorption were then merged into one CD-MUSIC model to predict the binary DMA+Si adsorption behavior. Silicic acid (500 μM) was thus predicted by the model to strongly compete for DMA with up to 60% mobilization of the latter at a pH6. This model result could be verified subsequently by experimental batch equilibrium data with zero adjustable parameters. The thus quantified antagonistic relation between DMA and silicic acid is discussed as one of factors to explain the increase of the DMA proportion in rice grains as observed upon silica fertilization of rice fields.
Date of acceptance
2014
Autoren
Autoren-URL
https://www.ncbi.nlm.nih.gov/pubmed/25478657
DOI
10.1016/j.scitotenv.2014.11.093
eISSN
1879-1026
Zeitschrift
Sci Total Environ
Schlüsselwörter
  • Adsorption
  • Arsenic
  • CD-MUSIC
  • DMA
  • Goethite
  • Paddy soil
  • Plaques
  • Rice
  • Adsorption
  • Cacodylic Acid
  • Iron Compounds
  • Minerals
  • Models, Molecular
  • Silicic Acid
  • Surface Properties
Sprache
eng
Country
Netherlands
Paginierung
199 - 205
PII
S0048-9697(14)01694-5
Datum der Veröffentlichung
2015
Status
Published
Datum, an dem der Datensatz öffentlich gemacht wurde
2015
Titel
Silicic acid competes for dimethylarsinic acid (DMA) immobilization by the iron hydroxide plaque mineral goethite.
Sub types
  • Journal Article
  • Research Support, Non-U.S. Gov't
Ausgabe der Zeitschrift
508

Datenquelle: PubMed

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