Quick Search:    advanced search

GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help

This Article Figures Only Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Web of Science (12) Citing Articles via Google Scholar Google Scholar Articles by Hepinstall, S. E. Articles by Maurice, P. A. Search for Related Content GeoRef GeoRef Citation

EFFECTS OF SIDEROPHORES ON Pb AND Cd ADSORPTION TO KAOLINITE

Department of Civil Engineering & Geological Sciences, University of Notre Dame, Notre Dame, IN 46556, USA

^* E-mail address of corresponding author: pmaurice{at}nd.edu

Siderophores are low molecular weight organic ligands synthesized by aerobic microorganisms to acquire Fe. In addition to Fe(III), siderophores may complex other metals such as Pb and Cd. This study compared the effects of the trihydroxamate siderophores desferrioxamine-B (DFO-B), desferrioxamine-D₁ (DFO-D₁), desferrioxamine-E (DFO-E), and the monohydroxamate siderophore-like ligand acetohydroxamic acid (aHA) on Pb and Cd (except for DFO-E) adsorption to kaolinite (KGa-1b) at pH 4.5 to 9, in 0.1 M NaClO₄, at 22°C, in the dark. At pH >6, all of the studied ligands decreased Pb adsorption to kaolinite: aHA by 5–40% and DFO-B, DFO-D₁ and DFO-E by 30–75%; the greater effects were at higher pH. The studied ligands decreased Cd adsorption to kaolinite at pH >8: aHA by 5–20% and the trihydroxamates by as much as 80%. We also observed enhancement of Pb adsorption in the presence of DFO-B at pH ~5–6.0, probably due to adsorption of the doubly positively charged H₃Pb (DFO-B)²⁺complex, although spectroscopic evidence is needed.

Key Words: Adsorption • Cadmium • Kaolinite • Lead • Ligand • Siderophore

This article has been cited by other articles:

				Y. Hashimoto, H. Matsufuru, M. Takaoka, H. Tanida, and T. Sato Impacts of Chemical Amendment and Plant Growth on Lead Speciation and Enzyme Activities in a Shooting Range Soil: An X-ray Absorption Fine Structure Investigation J. Environ. Qual., May 20, 2009; 38(4): 1420 - 1428. [Abstract] [Full Text] [PDF]