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 (SCI-Expanded) 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 (SCI-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
  • Çanakkale Onsekiz Mart University Affiliated: No

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.