TY - JOUR
T1 - Pb(II) and Eu(III) adsorption by goethite in the presence of natural and synthetic hydroxamate siderophores
AU - Krämer, Stephan
AU - Xu, Jide
AU - Raymond, Kenneth N.
AU - Sposito, Garrison
N1 - Zeitschrift: Environmental Science and Technology
DOI: 10.1021/es010182c
Coden: ESTHA
Affiliations: Division of Ecosystem Sciences, University of California, Berkeley, CA 94720-3110, United States
Adressen: Krämer, S.M.; Division of Ecosystem Sciences; University of California Berkeley, CA 94720-3110, United States; email: stephan.Krä[email protected]
Source-File: 533Scopus090408.csv
Import aus Scopus: 2-s2.0-0037085632
Importdatum: 15.04.2008 15:59:36
PY - 2002
Y1 - 2002
N2 - Trihydroxamate siderophores have been proposed for use as mediators of actinide and heavy metal mobility in contaminated subsurface zones. These microbially produced ligands, common in terrestrial and marine environments, recently have been derivatized synthetically to enhance their affinity for transuranic metal cations. However, the interactions between these synthetic derivative and adsorbed trace metals have not been characterized. In this paper we compare a natural siderophore, desferrioxamine-B (DFO-B), with its actinide-specific catecholate derivative, N-(2,3-dihydroxy-4-(methylamido)benzoyl)-desferrioxamine-B (DFOMTA), as to their effect on the adsorption of Pb(II) and Eu(III) by goethite and boehmite. In the presence of 240 ?M DFO-B, a strongly depleting effect on Eu(III) adsorption by goethite and boehmite occurred above pH 6. By contrast, almost total removal of Eu(III) from solution in the neutral to slightly acidic pH range was observed in the presence of either 10 or 100 ?M DFOMTA, due primarily to the formation of metal-DFOMTA precipitates. Addition of DFOMTA caused an increase in Pb(II) adsorption by goethite below pH 5, but a decrease above pH 5, such that the Pb(II) adsorption edge in the presence of DFOMTA strongly resembled the DFOMTA adsorption envelope, which showed a maximum near pH5 and decreasing adsorption toward lower and higher pH.
AB - Trihydroxamate siderophores have been proposed for use as mediators of actinide and heavy metal mobility in contaminated subsurface zones. These microbially produced ligands, common in terrestrial and marine environments, recently have been derivatized synthetically to enhance their affinity for transuranic metal cations. However, the interactions between these synthetic derivative and adsorbed trace metals have not been characterized. In this paper we compare a natural siderophore, desferrioxamine-B (DFO-B), with its actinide-specific catecholate derivative, N-(2,3-dihydroxy-4-(methylamido)benzoyl)-desferrioxamine-B (DFOMTA), as to their effect on the adsorption of Pb(II) and Eu(III) by goethite and boehmite. In the presence of 240 ?M DFO-B, a strongly depleting effect on Eu(III) adsorption by goethite and boehmite occurred above pH 6. By contrast, almost total removal of Eu(III) from solution in the neutral to slightly acidic pH range was observed in the presence of either 10 or 100 ?M DFOMTA, due primarily to the formation of metal-DFOMTA precipitates. Addition of DFOMTA caused an increase in Pb(II) adsorption by goethite below pH 5, but a decrease above pH 5, such that the Pb(II) adsorption edge in the presence of DFOMTA strongly resembled the DFOMTA adsorption envelope, which showed a maximum near pH5 and decreasing adsorption toward lower and higher pH.
M3 - Article
SN - 0013-936X
VL - 36
SP - 1287
EP - 1291
JO - Environmental Science & Technology
JF - Environmental Science & Technology
IS - 6
ER -
