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Title: Effect of biofilm coatings at metal-oxide/water interfaces I: Pb(II) and Zn(II) partitioning and speciation at Shewanella oneidensis/metal-oxide/water interfaces

Journal Article · · Geochimica et Cosmochimica Acta
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [8];  [9];  [1];  [10]
  1. Stanford Univ., Stanford, CA (United States)
  2. Stanford Univ., Stanford, CA (United States); Univ. of Paris Diderot, Paris (France)
  3. Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States); Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
  4. Argonne National Lab. (ANL), Argonne, IL (United States)
  5. Karlsruhe Inst. of Technology (KIT) Karlsruhe (Germany); Stanford Univ., Stanford, CA (United States)
  6. Univ. Pierre et Marie Curie, Paris (France)
  7. Univ. of Chicago, Chicago, IL (United States)
  8. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  9. Stanford Univ., Stanford, CA (United States); Museum National d'Histoire Naturelle, Paris (France)
  10. Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
+ Show Author Affiliations

Microbial biofilms are often present as coatings on metal-oxide surfaces in natural and industrial environments and may induce significant changes in the partitioning behavior and speciation of aqueous metal ions, which in turn can impact their transport and fate. In this study, long-period X-ray standing wave-fluorescence yield (LP-XSW-FY) spectroscopy was used to measure under in situ conditions the partitioning of aqueous Pb(II) and Zn(II) between multilayer Shewanella oneidensis MR-1 biofilms and highly polished, oriented single-crystal surfaces of α-Al2O3 and α-Fe2O3 as a function of metal-ion concentration and time at pH 6.0. We show that after 3-h exposure time, Pb(II) binds preferentially to the alpha-Al2O3 (1-102) and α-Fe2O3 (0001) surfaces at low Pb concentration ([Pb] = 10–7 M) and then increasingly partitions into the biofilm coatings at higher concentrations (10–6 to 10–4 M). In contrast, Zn(II) partitions preferentially into the biofilm coating for both surfaces at all Zn concentrations studied (10–7 to 10–4 M). In comparison, the α-Al2O3 (0001) surface has a low affinity for both Pb(II) and Zn(II), and the biofilm coatings are the dominant sink for both ions. These findings suggest that in the presence of S. oneidensis biofilm coatings, α-Al2O3 (0001) is the least reactive surface for Pb(II) and Zn(II) compared to α-Al2O3 (1-102) and α-Fe2O3 (0001). They also show that Zn(II) has a lower affinity than Pb(II) for reactive sites on α-Al2O3 (1-102) and α-Fe2O3 (0001) at [Me(II)] of 10–7 M; at 10–5 M, the bulk of the metal ions partition into the biofilm coatings. At longer exposure times (20-24 h), both Pb(II) and Zn(II) increasingly partition to the metal-oxide surfaces at [Me(II)] = 10–5 M and pH 6.0, indicating possible reaction/diffusion-controlled sorption processes. Pb L-III-edge and Zn K-edge grazing-incidence extended X-ray absorption fine structure (GI-EXAFS) measurements suggest that both Pb(II) and Zn(II) ions may be complexed by carboxyl groups in S. oneidensis biofilms after 3-h exposure at pH 6.0 and [Me(II)] = 10–5 M. In contrast with Burkholderia cepacia, which was used in our previous studies of monolayer biofilm-coated metal-oxide surfaces (Templeton et al., 2001), S. oneidensis MR-1 forms relatively thick biofilm coatings (6-20 μm) that are rich in reactive functional groups and are expected to dominate metal-ion adsorption. Lastly, our results show that even thick and highly reactive biofilms like S. oneidensis do not cause much change in the intrinsic chemical reactivities of the underlying metal-oxide surfaces with respect to aqueous Pb(II) and Zn(II) and don't block reactive sites on the metal-oxide surfaces; instead they reduce the rate of Pb(II) and Zn(II) sorption onto these surfaces.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division; National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC02-06CH11357; FG02-94ER14466
OSTI ID:
1340297
Alternate ID(s):
OSTI ID: 1430547
Journal Information:
Geochimica et Cosmochimica Acta, Vol. 188, Issue C; ISSN 0016-7037
Publisher:
The Geochemical Society; The Meteoritical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 17 works
Citation information provided by
Web of Science

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Related Subjects

58 GEOSCIENCES
59 BASIC BIOLOGICAL SCIENCES
Shewanella oneidensis
biofilms
metal-oxide surface
sorption
Pb
Zn
hematite
alumina
X-ray standing wave
LP-XSW-FY
metal partitioning
diffusion
kinetics