Effects of oxidation state on metal ion binding by Medicago sativa (Alfalfa): Atomic and X-ray absorption spectroscopic studies with FE(II) and FE(III)

K. J. Tiemann, J. L. Gardea-Torresdey, G. Gamez, K. Dokken, I. Cano-Aguilera, M. W. Renner, Lars R Furenlid

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

We present here experimental results that investigate the effects of metal-ion binding on iron-ion sorption to and recovery from alfalfa biomass. Fe(II)- and Fe(III)-ion binding were measured in order to ascertain the differences in binding strengths due to changes in oxidation state. Stronger binding was found for iron(III)-biomass as compared to iron(II)-biomass. The optimal pH for iron uptake was determined to be 5. The results of pH binding profile, iron desorption, and temperature-dependent binding experiments as well as X-ray spectroscopic (XAS) measurements all suggest that binding of iron by alfalfa biomass may be occurring through carboxyl ligands. The XAS experiments further demonstrate that the metal binding proceeds without an oxidation state change, and both iron(II) and iron(III) have similar coordination environments. The information presented will assist in understanding the binding of other metals to alfalfa biomass and in developing methods for their recovery.

Original languageEnglish (US)
Pages (from-to)693-698
Number of pages6
JournalEnvironmental Science and Technology
Volume34
Issue number4
DOIs
StatePublished - Feb 15 2000
Externally publishedYes

Fingerprint

X ray absorption
alfalfa
Metal ions
Iron
oxidation
iron
Oxidation
ion
metal
Biomass
biomass
Metals
effect
Ions
Recovery
X rays
metal binding
ligand
Sorption
Desorption

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Science(all)
  • Environmental Chemistry

Cite this

Effects of oxidation state on metal ion binding by Medicago sativa (Alfalfa) : Atomic and X-ray absorption spectroscopic studies with FE(II) and FE(III). / Tiemann, K. J.; Gardea-Torresdey, J. L.; Gamez, G.; Dokken, K.; Cano-Aguilera, I.; Renner, M. W.; Furenlid, Lars R.

In: Environmental Science and Technology, Vol. 34, No. 4, 15.02.2000, p. 693-698.

Research output: Contribution to journalArticle

Tiemann, K. J. ; Gardea-Torresdey, J. L. ; Gamez, G. ; Dokken, K. ; Cano-Aguilera, I. ; Renner, M. W. ; Furenlid, Lars R. / Effects of oxidation state on metal ion binding by Medicago sativa (Alfalfa) : Atomic and X-ray absorption spectroscopic studies with FE(II) and FE(III). In: Environmental Science and Technology. 2000 ; Vol. 34, No. 4. pp. 693-698.
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abstract = "We present here experimental results that investigate the effects of metal-ion binding on iron-ion sorption to and recovery from alfalfa biomass. Fe(II)- and Fe(III)-ion binding were measured in order to ascertain the differences in binding strengths due to changes in oxidation state. Stronger binding was found for iron(III)-biomass as compared to iron(II)-biomass. The optimal pH for iron uptake was determined to be 5. The results of pH binding profile, iron desorption, and temperature-dependent binding experiments as well as X-ray spectroscopic (XAS) measurements all suggest that binding of iron by alfalfa biomass may be occurring through carboxyl ligands. The XAS experiments further demonstrate that the metal binding proceeds without an oxidation state change, and both iron(II) and iron(III) have similar coordination environments. The information presented will assist in understanding the binding of other metals to alfalfa biomass and in developing methods for their recovery.",
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T2 - Atomic and X-ray absorption spectroscopic studies with FE(II) and FE(III)

AU - Tiemann, K. J.

AU - Gardea-Torresdey, J. L.

AU - Gamez, G.

AU - Dokken, K.

AU - Cano-Aguilera, I.

AU - Renner, M. W.

AU - Furenlid, Lars R

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N2 - We present here experimental results that investigate the effects of metal-ion binding on iron-ion sorption to and recovery from alfalfa biomass. Fe(II)- and Fe(III)-ion binding were measured in order to ascertain the differences in binding strengths due to changes in oxidation state. Stronger binding was found for iron(III)-biomass as compared to iron(II)-biomass. The optimal pH for iron uptake was determined to be 5. The results of pH binding profile, iron desorption, and temperature-dependent binding experiments as well as X-ray spectroscopic (XAS) measurements all suggest that binding of iron by alfalfa biomass may be occurring through carboxyl ligands. The XAS experiments further demonstrate that the metal binding proceeds without an oxidation state change, and both iron(II) and iron(III) have similar coordination environments. The information presented will assist in understanding the binding of other metals to alfalfa biomass and in developing methods for their recovery.

AB - We present here experimental results that investigate the effects of metal-ion binding on iron-ion sorption to and recovery from alfalfa biomass. Fe(II)- and Fe(III)-ion binding were measured in order to ascertain the differences in binding strengths due to changes in oxidation state. Stronger binding was found for iron(III)-biomass as compared to iron(II)-biomass. The optimal pH for iron uptake was determined to be 5. The results of pH binding profile, iron desorption, and temperature-dependent binding experiments as well as X-ray spectroscopic (XAS) measurements all suggest that binding of iron by alfalfa biomass may be occurring through carboxyl ligands. The XAS experiments further demonstrate that the metal binding proceeds without an oxidation state change, and both iron(II) and iron(III) have similar coordination environments. The information presented will assist in understanding the binding of other metals to alfalfa biomass and in developing methods for their recovery.

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