XAFS determination of the bacterial cell wall functional groups responsible for complexation of Cd and U as a function of pH

S. D. Kelly, M. I. Boyanov, B. A. Bunker, J. B. Fein, D. A. Fowle, N. Yee, K. M. Kemner

Research output: Contribution to journalArticlepeer-review

45 Scopus citations

Abstract

Bacteria, which are ubiquitous in near-surface geologic systems, can affect the distribution and fate of metals in these systems through adsorption reactions between the metals and bacterial cell walls. Recently, Fein et al. (1997) developed a chemical equilibrium approach to quantify metal adsorption onto cell walls, treating the sorption as a surface complexation phenomenon. However, such models are based on circumstantial bulk adsorption evidence only, and the nature and mechanism of metal binding to cell walls for each metal system have not been determined spectroscopically. The results of XAFS measurements at the Cd K-edge and U L3-edge on Bacillus subtilis exposed to these elements show that, at low pH, U binds to phosphoryl groups while Cd binds to carboxyl functional groups.

Original languageEnglish (US)
Pages (from-to)946-948
Number of pages3
JournalJournal of Synchrotron Radiation
Volume8
Issue number2
DOIs
StatePublished - Mar 1 2001
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Radiation
  • Nuclear and High Energy Physics
  • Instrumentation

Keywords

  • Biogeochemistry
  • Cadmium
  • Environmental science
  • Microbiology
  • Uranium

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