Bio-sorption of neptunium(V) by Pseudomonas fluorescens

Warinthorn Songkasiri, Donald T. Reed, Bruce Rittmann

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

The bio-sorption of neptunyl (NpO2 +) by Pseudomonas fluorescens was investigated. The overall goals of this research are to identify key interactions between neptunium and soil bacteria and to model these effects under subsurface-related conditions. Neptunyl, which is generally thought to be non-sorptive, was significantly sorbed under all conditions studied. At initial neptunyl concentrations of 4.75 μM and pH = 7, as much as 85% of the neptunium was sorbed under aerobic conditions. Kinetic studies show that neptunyl was sorbed rapidly within the first 15 minutes. The extent of sorption also increased with pH. In all cases, the sorbed neptunium was shown to be NpO2 + by x-ray absorption near edged spectroscopy (XANES) analysis, confirming that there was no reduction to Np(IV) under the conditions of our experiment. The sorption data were modeled using Langmuir and Freundlich isotherms. A comparison of the two approaches showed a significantly better fit for the Freundlich isotherm, and the Freundlich parameter values suggest interactions between sorbed NpO2 + molecules. These data show that bio-sorption, even for neptunyl, has a significant role in defining the speciation of neptunium and, hence, its overall mobility in the subsurface.

Original languageEnglish (US)
Pages (from-to)785-789
Number of pages5
JournalRadiochimica Acta
Volume90
Issue number9-11
StatePublished - 2002
Externally publishedYes

Fingerprint

Neptunium
neptunium
pseudomonas
sorption
Sorption
Isotherms
isotherms
x ray absorption
bacteria
soils
Bacteria
interactions
Spectroscopy
Soils
X rays
Molecules
Kinetics
kinetics
spectroscopy
molecules

Keywords

  • Bio-sorption
  • Isotherms
  • Neptunium
  • Pseudomonas

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Nuclear Energy and Engineering

Cite this

Songkasiri, W., Reed, D. T., & Rittmann, B. (2002). Bio-sorption of neptunium(V) by Pseudomonas fluorescens. Radiochimica Acta, 90(9-11), 785-789.

Bio-sorption of neptunium(V) by Pseudomonas fluorescens. / Songkasiri, Warinthorn; Reed, Donald T.; Rittmann, Bruce.

In: Radiochimica Acta, Vol. 90, No. 9-11, 2002, p. 785-789.

Research output: Contribution to journalArticle

Songkasiri, W, Reed, DT & Rittmann, B 2002, 'Bio-sorption of neptunium(V) by Pseudomonas fluorescens', Radiochimica Acta, vol. 90, no. 9-11, pp. 785-789.
Songkasiri, Warinthorn ; Reed, Donald T. ; Rittmann, Bruce. / Bio-sorption of neptunium(V) by Pseudomonas fluorescens. In: Radiochimica Acta. 2002 ; Vol. 90, No. 9-11. pp. 785-789.
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