Speciation and mobility of arsenic in agricultural lime

Autoren

Gerald T Schmidt
Ka Hei Lui
Michael Kersten

Autoren-URL

https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=fis-test-1&SrcAuth=WosAPI&KeyUT=WOS:000269627400030&DestLinkType=FullRecord&DestApp=WOS_CPL

DOI

10.2134/jeq2008.0441

eISSN

1537-2537

Externe Identifier

Clarivate Analytics Document Solution ID: 492AX
PubMed Identifier: 19704149

ISSN

0047-2425

Ausgabe der Veröffentlichung

5

Zeitschrift

JOURNAL OF ENVIRONMENTAL QUALITY

Paginierung

2058 - 2069

Datum der Veröffentlichung

2009

Status

Published

Titel

Speciation and Mobility of Arsenic in Agricultural Lime

Sub types

Article

Ausgabe der Zeitschrift

38

Data source: Web of Science (Lite)

Abstract

Agricultural liming materials are used to correct soil acidity and to improve plant growth and microbial functionality. A relatively low‐grade agricultural lime was found to contain up to 125 mg kg−1 arsenic (As), which is above any fertilizing materials code threshold. The color of the milled material is brown due to ample oxide dendrites. Microprobe elemental maps confirmed that these accessory oxide mineral phases are responsible for the elevated As concentrations in the limestone. The black Mn‐bearing dendrites contain minor amounts of As, whereas the brown Fe‐bearing dendrites contain the major part of the As inventory, with an Fe/As molar ratio around 100. Because the elemental maps represent only a few sample regions of interest (ROI), the results are corroborated by a bulk five‐step sequential extraction of the lime, which suggests that a majority of the As is bound to acid‐reducible phases. Because repartitioning of the As oxyanion during extraction cannot be ruled out, X‐ray absorption spectroscopy with micrometer resolution (μ‐XAS) was used as a solid‐state speciation analysis approach. The μ‐XAS results at the Fe K‐edge for the selected ROIs revealed the brown dendrites to consist of ferrihydrite and goethite, whereas those at the As K‐edge revealed that the pentavalent As species arsenate predominates, with As‐Fe distance and coordination indicating binding as a mononuclear inner‐spheric adsorbate complex. Batch experiments with soil exposed to submerged conditions of up to 41 d revealed a negligible As release rate from the lime (approximately 40 ng kg−1 d−1). The results of this study corroborate regulatory codes that set the permissible As content in agricultural lime relative to the respective Fe content.

Autoren

Gerald T Schmidt
Ka Hei Lui
Michael Kersten

DOI

10.2134/jeq2008.0441

eISSN

1537-2537

ISSN

0047-2425

Ausgabe der Veröffentlichung

5

Zeitschrift

Journal of Environmental Quality

Sprache

en

Online publication date

2009

Paginierung

2058 - 2069

Datum der Veröffentlichung

2009

Status

Published

Herausgeber

Wiley

Herausgeber URL

http://dx.doi.org/10.2134/jeq2008.0441

Datum der Datenerfassung

2023

Titel

Speciation and Mobility of Arsenic in Agricultural Lime

Ausgabe der Zeitschrift

38

Data source: Crossref

Abstract

Agricultural liming materials are used to correct soil acidity and to improve plant growth and microbial functionality. A relatively low-grade agricultural lime was found to contain up to 125 mg kg(-1) arsenic (As), which is above any fertilizing materials code threshold. The color of the milled material is brown due to ample oxide dendrites. Microprobe elemental maps confirmed that these accessory oxide mineral phases are responsible for the elevated As concentrations in the limestone. The black Mn-bearing dendrites contain minor amounts of As, whereas the brown Fe-bearing dendrites contain the major part of the As inventory, with an Fe/As molar ratio around 100. Because the elemental maps represent only a few sample regions of interest (ROI), the results are corroborated by a bulk five-step sequential extraction of the lime, which suggests that a majority of the As is bound to acid-reducible phases. Because repartitioning of the As oxyanion during extraction cannot be ruled out, X-ray absorption spectroscopy with micrometer resolution (micro-XAS) was used as a solid-state speciation analysis approach. The micro-XAS results at the Fe K-edge for the selected ROIs revealed the brown dendrites to consist of ferrihydrite and goethite, whereas those at the As K-edge revealed that the pentavalent As species arsenate predominates, with As-Fe distance and coordination indicating binding as a mononuclear inner-spheric adsorbate complex. Batch experiments with soil exposed to submerged conditions of up to 41 d revealed a negligible As release rate from the lime (approximately 40 ng kg(-1) d(-1)). The results of this study corroborate regulatory codes that set the permissible As content in agricultural lime relative to the respective Fe content.

Addresses

Environmental Geochemistry Group, Institute of Geosciences, Becherweg 21, Johannes Gutenberg-Univ., 55099 Mainz, Germany.

Autoren

Gerald T Schmidt
Ka Hei Lui
Michael Kersten

DOI

10.2134/jeq2008.0441

eISSN

1537-2537

Externe Identifier

PubMed Identifier: 19704149

Funding acknowledgements

U.S. Department of Energy: DE‐AC02‐05CH11231
Office of Science:

Open access

false

ISSN

0047-2425

Ausgabe der Veröffentlichung

5

Zeitschrift

Journal of environmental quality

Schlüsselwörter

Calcium Compounds
Calcium Carbonate
Oxides
Arsenic
Calcium
Iron
Manganese
Spectrum Analysis
X-Rays
Agriculture

Sprache

eng

Medium

Electronic-Print

Online publication date

2009

Paginierung

2058 - 2069

Datum der Veröffentlichung

2009

Status

Published

Datum der Datenerfassung

2009

Titel

Speciation and mobility of arsenic in agricultural lime.

Sub types

Research Support, Non-U.S. Gov't
Journal Article

Ausgabe der Zeitschrift

38

Data source: Europe PubMed Central

Abstract

Agricultural liming materials are used to correct soil acidity and to improve plant growth and microbial functionality. A relatively low-grade agricultural lime was found to contain up to 125 mg kg(-1) arsenic (As), which is above any fertilizing materials code threshold. The color of the milled material is brown due to ample oxide dendrites. Microprobe elemental maps confirmed that these accessory oxide mineral phases are responsible for the elevated As concentrations in the limestone. The black Mn-bearing dendrites contain minor amounts of As, whereas the brown Fe-bearing dendrites contain the major part of the As inventory, with an Fe/As molar ratio around 100. Because the elemental maps represent only a few sample regions of interest (ROI), the results are corroborated by a bulk five-step sequential extraction of the lime, which suggests that a majority of the As is bound to acid-reducible phases. Because repartitioning of the As oxyanion during extraction cannot be ruled out, X-ray absorption spectroscopy with micrometer resolution (micro-XAS) was used as a solid-state speciation analysis approach. The micro-XAS results at the Fe K-edge for the selected ROIs revealed the brown dendrites to consist of ferrihydrite and goethite, whereas those at the As K-edge revealed that the pentavalent As species arsenate predominates, with As-Fe distance and coordination indicating binding as a mononuclear inner-spheric adsorbate complex. Batch experiments with soil exposed to submerged conditions of up to 41 d revealed a negligible As release rate from the lime (approximately 40 ng kg(-1) d(-1)). The results of this study corroborate regulatory codes that set the permissible As content in agricultural lime relative to the respective Fe content.

Autoren

Gerald T Schmidt
Ka Hei Lui
Michael Kersten

Autoren-URL

https://www.ncbi.nlm.nih.gov/pubmed/19704149

DOI

10.2134/jeq2008.0441

ISSN

0047-2425

Ausgabe der Veröffentlichung

5

Zeitschrift

J Environ Qual

Schlüsselwörter

Agriculture
Arsenic
Calcium
Calcium Carbonate
Calcium Compounds
Iron
Manganese
Oxides
Spectrum Analysis
X-Rays

Sprache

eng

Country

United States

Paginierung

2058 - 2069

PII

38/5/2058

Datum der Veröffentlichung

2009

Status

Published online

Datum, an dem der Datensatz öffentlich gemacht wurde

2009

Titel

Speciation and mobility of arsenic in agricultural lime.

Sub types

Journal Article
Research Support, Non-U.S. Gov't

Ausgabe der Zeitschrift

38

Data source: PubMed

Speciation and mobility of arsenic in agricultural lime

Tools