Radiotoxicity of neptunium(V) and neptunium(V)-nitrilotriacetic acid (NTA) complexes towards Chelatobacter heintzii

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The objective of this work was to investigate the toxicity mechanisms of neptunium and the neptunium-NTA complex towards Chelatobacter heintzii. The results show that metal toxicity of aquo NpO{sub 2}{sup +} may significantly limit growth of Cl heintzii at free metal ion concentrations greater than {approx} 10{sup {minus}5} M. However, neptunium concentrations {ge} 10{sup {minus}4} M do not cause measurable radiotoxicity effects in C. heintzii when present in the form of a neptunium-NTA complex or colloidal/precipitated neptunium-phosphate. The neptunium-NTA complex, which is stable under aerobic conditions, is destabilized by microbial degradation of NTA. When phosphate was present, degradation of NTA ... continued below

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41 p.

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Banaszak, J.E.; Reed, D.T. & Rittmann, B.E. March 10, 1997.

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  • Banaszak, J.E. Northwestern Univ., Evanston, IL (United States). Dept. of Civil Engineering
  • Reed, D.T. Argonne National Lab., IL (United States). Chemical Technology Div.
  • Rittmann, B.E. Northwestern Univ., Evanston, IL (United States). Dept. of Civil Engineering

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Description

The objective of this work was to investigate the toxicity mechanisms of neptunium and the neptunium-NTA complex towards Chelatobacter heintzii. The results show that metal toxicity of aquo NpO{sub 2}{sup +} may significantly limit growth of Cl heintzii at free metal ion concentrations greater than {approx} 10{sup {minus}5} M. However, neptunium concentrations {ge} 10{sup {minus}4} M do not cause measurable radiotoxicity effects in C. heintzii when present in the form of a neptunium-NTA complex or colloidal/precipitated neptunium-phosphate. The neptunium-NTA complex, which is stable under aerobic conditions, is destabilized by microbial degradation of NTA. When phosphate was present, degradation of NTA led to the precipitation of a neptunium-phosphate phase.

Physical Description

41 p.

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INIS; OSTI as DE97007211

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  • Other Information: PBD: 10 Mar 1997

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  • Other: DE97007211
  • Report No.: ANL/CMT/PP--92976
  • Grant Number: W-31109-ENG-38
  • DOI: 10.2172/495744 | External Link
  • Office of Scientific & Technical Information Report Number: 495744
  • Archival Resource Key: ark:/67531/metadc679118

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Creation Date

  • March 10, 1997

Added to The UNT Digital Library

  • July 25, 2015, 2:21 a.m.

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  • Dec. 14, 2015, 6:32 p.m.

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Banaszak, J.E.; Reed, D.T. & Rittmann, B.E. Radiotoxicity of neptunium(V) and neptunium(V)-nitrilotriacetic acid (NTA) complexes towards Chelatobacter heintzii, report, March 10, 1997; Illinois. (digital.library.unt.edu/ark:/67531/metadc679118/: accessed December 15, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.