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The Role of Siderophores in the Transport of Radionuclides

Published online by Cambridge University Press:  01 January 1992

Larry E. Hersman ,
Philip D. Palmer  and
David E. Hobart
Larry E. Hersman
Affiliation:
Life Sciences Division, Los Alamos National Laboratory, Los Alamos, NM
Philip D. Palmer
Affiliation:
Isotope and Nuclear Chemistry Division, Los Alamos National Laboratory, Los Alamos, NM
David E. Hobart
Affiliation:
Isotope and Nuclear Chemistry Division, Los Alamos National Laboratory, Los Alamos, NM
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Abstract

Iron exists in aerobic soil and water environments most commonly as insoluble Fe(III). Siderophores are powerful, microbially produced chelating agents that are used to mobilize the insoluble Fe(III) cation. Over 80 siderophores have been isolated and characterized, with some reportedly having iron-binding constants as high as 1052. Fe(III) and Pu(IV) are similar in their charge/ionic radius ratio (4.6 and 4.2, respectively); therefore, Pu(IV) may serve as analog to Fe(III). It is possible that some radioactive wastes could be chelated by naturally occurring siderophores, thereby altering the transport rates of those elements through the subsurface environment. This investigation wn 9 initiated to investigate that possibility. The binding of 239Pu(IV) by four chelating agents is reported in this paper: a siderophore isolated and purified from a Pseudomonas sp.; desferal, a ferrioxamine siderophore commonly used for deferration therapy; EDTA, ethylenediaminetetraacetic acid; and, citrate, trisodium salt.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 294: Symposium V – Scientific Basis for Nuclear Waste Management XVI , 1992 , 765
Copyright
Copyright © Materials Research Society 1993

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