Binding of Pu(IV) to galacturonic acid and extracellular polymeric substances (EPS) from Shewanella putrefaciens, Clostridium sp and Pseudomonas fluorescens


Harper R. M. , Kantar C., Honeyman B. D.

RADIOCHIMICA ACTA, vol.96, pp.753-762, 2008 (Peer-Reviewed Journal) identifier identifier

  • Publication Type: Article / Article
  • Volume: 96
  • Publication Date: 2008
  • Doi Number: 10.1524/ract.2008.1562
  • Journal Name: RADIOCHIMICA ACTA
  • Journal Indexes: Science Citation Index Expanded, Scopus
  • Page Numbers: pp.753-762
  • Keywords: Plutonium, Galacturonic acid, EPS, Complexation, Binding, SOLUBLE MICROBIAL PRODUCTS, CHEMICAL-EQUILIBRIUM MODEL, STABILITY-CONSTANTS, ACTIVATED SLUDGES, METAL ADSORPTION, SHALLOW AQUIFER, HEAVY-METALS, ALGINIC ACID, COMPLEXATION, PLUTONIUM

Abstract

The conditional stability constants for trace-level concentrations of Pu(IV) complexing with galacturonic acid and EPS, isolated from axenic Clostridium sp., P. fluorescens and Shewanella putrefaciens CN32 cultures, were determined at pH 4 and an ionic strength of 0.1 M NaCl using ail ion-exchange technique. The analysis of ion-exchange data with Schubert's technique indicates that the Pu binding by galacturonic acid and EPS from Clostridium sp. and S. putrefaciens can be described based on the formation of 1 : 1 Pu(IV)-ligand complexes. However, the accurate description of Pu binding by EPS from P. fluorescens requires postulation of a mixture of 1 : 1/1 : 2 complexes between Pu(IV) and ligands under the experimental conditions studied.