A novel technique to determine cobalt exchangeability in soils using isotope dilution

Laura A. Wendling, Jason K. Kirby, Michael J. Mclaughlin

Research output: Contribution to journalArticleScientificpeer-review

12 Citations (Scopus)

Abstract

The environmental risk posed by Co contamination is largely a function of its oxidation state. Our objective was to assess the potential biological availability of Co and the reactions and fate of soluble Co(II) after addition to soils with varying physical and chemical characteristics. A potential risk in quantifying exchangeable Co in soils using isotope dilution techniques is the possible presence of two species of Co in soil solution and adsorbed on soil solid phases [Co(II) and Co(III)], coupled with the possibility that when an isotope of Co is added it may undergo a change in oxidation state during the measurement phase. In this study, we have utilized an isotope dilution technique with cation exchange and high-performance liquid chromatography-inductively coupled plasma-mass spectrometry to determine the isotopically exchangeable Co fraction in several soils with varying characteristics such as differing Al, Fe, and Mn oxide content; pH; and organic carbon content. The application of the cation exchange procedure adjusts measurements of isotopically exchangeable Co to correct for the presence of non-exchangeable 57Co not in equilibrium with the solution phase. Results indicated that oxidation of added 57Co(II) to 57Co(III) or precipitation of 57Co(II) may occur on the surfaces of some soils, particularly those with a high pH or substantial quantities of Mn oxide minerals. No detectable Co(III)(aq) was found in the aqueous extracts of the soils examined.

Original languageEnglish
Pages (from-to)140-146
JournalEnvironmental Science and Technology
Volume42
Issue number1
DOIs
Publication statusPublished - 1 Jan 2008
MoE publication typeA1 Journal article-refereed

Fingerprint

Cobalt
Isotopes
cobalt
Dilution
dilution
isotope
Soils
soil
oxidation
Oxidation
Cations
ion exchange
Oxide minerals
oxide
Inductively coupled plasma mass spectrometry
Phase measurement
High performance liquid chromatography
Organic carbon
environmental risk
Oxides

Keywords

  • Cobalt
  • E value
  • Exchangeability
  • Isotope dilution

Cite this

@article{63039d181e3a459388a9e8d02a78455f,
title = "A novel technique to determine cobalt exchangeability in soils using isotope dilution",
abstract = "The environmental risk posed by Co contamination is largely a function of its oxidation state. Our objective was to assess the potential biological availability of Co and the reactions and fate of soluble Co(II) after addition to soils with varying physical and chemical characteristics. A potential risk in quantifying exchangeable Co in soils using isotope dilution techniques is the possible presence of two species of Co in soil solution and adsorbed on soil solid phases [Co(II) and Co(III)], coupled with the possibility that when an isotope of Co is added it may undergo a change in oxidation state during the measurement phase. In this study, we have utilized an isotope dilution technique with cation exchange and high-performance liquid chromatography-inductively coupled plasma-mass spectrometry to determine the isotopically exchangeable Co fraction in several soils with varying characteristics such as differing Al, Fe, and Mn oxide content; pH; and organic carbon content. The application of the cation exchange procedure adjusts measurements of isotopically exchangeable Co to correct for the presence of non-exchangeable 57Co not in equilibrium with the solution phase. Results indicated that oxidation of added 57Co(II) to 57Co(III) or precipitation of 57Co(II) may occur on the surfaces of some soils, particularly those with a high pH or substantial quantities of Mn oxide minerals. No detectable Co(III)(aq) was found in the aqueous extracts of the soils examined.",
keywords = "Cobalt, E value, Exchangeability, Isotope dilution",
author = "Wendling, {Laura A.} and Kirby, {Jason K.} and Mclaughlin, {Michael J.}",
year = "2008",
month = "1",
day = "1",
doi = "10.1021/es071526n",
language = "English",
volume = "42",
pages = "140--146",
journal = "Environmental Science & Technology",
issn = "0013-936X",
publisher = "American Chemical Society",
number = "1",

}

A novel technique to determine cobalt exchangeability in soils using isotope dilution. / Wendling, Laura A.; Kirby, Jason K.; Mclaughlin, Michael J.

In: Environmental Science and Technology, Vol. 42, No. 1, 01.01.2008, p. 140-146.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - A novel technique to determine cobalt exchangeability in soils using isotope dilution

AU - Wendling, Laura A.

AU - Kirby, Jason K.

AU - Mclaughlin, Michael J.

PY - 2008/1/1

Y1 - 2008/1/1

N2 - The environmental risk posed by Co contamination is largely a function of its oxidation state. Our objective was to assess the potential biological availability of Co and the reactions and fate of soluble Co(II) after addition to soils with varying physical and chemical characteristics. A potential risk in quantifying exchangeable Co in soils using isotope dilution techniques is the possible presence of two species of Co in soil solution and adsorbed on soil solid phases [Co(II) and Co(III)], coupled with the possibility that when an isotope of Co is added it may undergo a change in oxidation state during the measurement phase. In this study, we have utilized an isotope dilution technique with cation exchange and high-performance liquid chromatography-inductively coupled plasma-mass spectrometry to determine the isotopically exchangeable Co fraction in several soils with varying characteristics such as differing Al, Fe, and Mn oxide content; pH; and organic carbon content. The application of the cation exchange procedure adjusts measurements of isotopically exchangeable Co to correct for the presence of non-exchangeable 57Co not in equilibrium with the solution phase. Results indicated that oxidation of added 57Co(II) to 57Co(III) or precipitation of 57Co(II) may occur on the surfaces of some soils, particularly those with a high pH or substantial quantities of Mn oxide minerals. No detectable Co(III)(aq) was found in the aqueous extracts of the soils examined.

AB - The environmental risk posed by Co contamination is largely a function of its oxidation state. Our objective was to assess the potential biological availability of Co and the reactions and fate of soluble Co(II) after addition to soils with varying physical and chemical characteristics. A potential risk in quantifying exchangeable Co in soils using isotope dilution techniques is the possible presence of two species of Co in soil solution and adsorbed on soil solid phases [Co(II) and Co(III)], coupled with the possibility that when an isotope of Co is added it may undergo a change in oxidation state during the measurement phase. In this study, we have utilized an isotope dilution technique with cation exchange and high-performance liquid chromatography-inductively coupled plasma-mass spectrometry to determine the isotopically exchangeable Co fraction in several soils with varying characteristics such as differing Al, Fe, and Mn oxide content; pH; and organic carbon content. The application of the cation exchange procedure adjusts measurements of isotopically exchangeable Co to correct for the presence of non-exchangeable 57Co not in equilibrium with the solution phase. Results indicated that oxidation of added 57Co(II) to 57Co(III) or precipitation of 57Co(II) may occur on the surfaces of some soils, particularly those with a high pH or substantial quantities of Mn oxide minerals. No detectable Co(III)(aq) was found in the aqueous extracts of the soils examined.

KW - Cobalt

KW - E value

KW - Exchangeability

KW - Isotope dilution

UR - http://www.scopus.com/inward/record.url?scp=37549008328&partnerID=8YFLogxK

U2 - 10.1021/es071526n

DO - 10.1021/es071526n

M3 - Article

VL - 42

SP - 140

EP - 146

JO - Environmental Science & Technology

JF - Environmental Science & Technology

SN - 0013-936X

IS - 1

ER -