Cited by 149Radioactive element chemistry and processingAdsorption and biosorption for pollutant removalRadioactivity and Radon Measurements

Biosorption of U(VI) by the green algae Chlorella vulgaris in dependence of pH value and cell activity

Vogel, M., Günther, A., Rossberg, A., Li, B., Bernhard, G., Raff, J.·2010·Science of The Total Environment

Abstract

Biosorption of uranium(VI) by the green alga Chlorella vulgaris was studied at varying uranium concentrations from 5 μM to 1mM, and in the environmentally relevant pH range of 4.4 to 7.0. Living cells bind in a 0.1mM uranium solution at pH 4.4 within 5 min 14.3 ± 5.5 mg U/g dry biomass and dead cells 28.3 ± 0.6 mg U/g dry biomass which corresponds to 45% and 90% of total uranium in solution, respectively. During 96 h of incubation with uranium initially living cells died off and with 26.6 ± 2.1 mg U/g dry biomass bound similar amounts of uranium compared to dead cells, binding 27.0 ± 0.7 mg U/g dry biomass. In both cases, these amounts correspond to around 85% of the initially applied uranium. Interestingly, at a lower and more environmentally relevant uranium concentration of 5 μM, living cells firstly bind with 1.3 ± 0.2 mg U/g dry biomass to 1.4 ± 0.1 mg U/g dry biomass almost all uranium within the first 5 min of incubation. But then algal cells again mobilize up to 80% of the bound uranium during ongoing incubation in the time from 48 h to 96 h. The release of metabolism related substances is suggested to cause this mobilization of uranium. As potential leachates for algal-bound uranium oxalate, citrate and ATP were tested and found to be able to mobilize more than 50% of the algal-bound uranium within 24h. Differences in complexation of uranium by active and inactive algae cells were investigated with a combination of time-resolved laser-induced fluorescence spectroscopy (TRLFS), extended X-ray absorption fine structure (EXAFS) spectroscopy and attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy. Obtained results demonstrated an involvement of carboxylic and organic/inorganic phosphate groups in the uranium complexation with varying contributions dependent on cell status, uranium concentration and pH.

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Crossref · 10.1016/j.scitotenv.2010.10.011

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  • The sensitivity of off-line MIR measurements can elucidate molecular changes within an organism facilitated by metal sorption, which may be useful to understand the accumulation of metals of microalgae treating wastewaters.

    “The sensitivity of off-line MIR measurements can also elucidate molecular changes within an organism facilitated by metal sorption [58-60], which may be useful to understand the accumulation of metals of microalgae treating wastewaters.”

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Authors
Vogel, M., Günther, A., Rossberg, A., Li, B., Bernhard, G., & Raff, J.
Affiliations
Helmholtz-Zentrum Dresden-Rossendorf (DE)
Corresponding author
Vogel, M.
Venue
Science of The Total Environment
Publisher
Elsevier BV
Published
2010-12-15
Volume
409
Issue
2
Pages
384-395
ISSN
0048-9697 (ISSN-L)
OpenAlex
W2008380066
Cited by
149
References
72
Citations by year
2026: 6 · 2025: 12 · 2024: 13 · 2023: 8 · 2022: 9 · 2021: 16 · 2020: 4 · 2019: 11 · 2018: 14 · 2017: 7 · 2016: 8 · 2015: 9 · 2014: 14 · 2013: 4 · 2012: 10
FWCI
3.52
Type
journal article
Language
en
Open access
closed
Locations
  • The Science of The Total Environment (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Physical Sciences › Chemistry › Inorganic Chemistry › Radioactive element chemistry and processing
  • Physical Sciences › Environmental Science › Water Science and Technology › Adsorption and biosorption for pollutant removal
  • Health Sciences › Health Professions › Radiological and Ultrasound Technology › Radioactivity and Radon Measurements
Keywords
Chlorella vulgaris, green algae, pH dependence, uranium mobilization, citrate, ATP, phosphate complexation, carboxyl groups, uranium complexation, uranium leaching, time-resolved laser-induced fluorescence, EXAFS, ATR-FTIR spectroscopy
MeSH terms
Fresh Water, Hydrogen-Ion Concentration, Uranium, Water Pollutants, Radioactive, Chlorella vulgaris

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