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Peer-reviewedCC BYScientific Reports

Mitigation of arsenic toxicity in natural waters using a bacterial biomineralizing system

  • Ethel Soto1
  • Claudia Vilo2
  • Paulina Aguayo3
  • Qunfeng Dong4
  • Carlos T. Smith1
  • Vincenzo Zammuto5
  • Concetta Gugliandolo5
  • Victor Guzman-Fierro6
  • Victor L. Campos1
6 affiliations
  1. 1Environmental Microbiology Laboratory, Department of Microbiology, Faculty of Biological Sciences, Universidad de Concepcion
  2. 2Health Sciences Faculty, Universidad del Alba
  3. 3Faculty of Environmental Sciences, EULA-Chile, Universidad de Concepción
  4. 4Center for Biomedical Informatics, Department of Medicine, Stritch School of Medicine, Loyola University Chicago
  5. 5Research Centre for Extreme Environments and Extremophiles, Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina
  6. 6Department of Materials Engineering, Faculty of Engineering, University of Concepción
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Abstract

Rivers of the hyper-arid Atacama Desert (Northern Chile), including Loa River, are characterized by extremely variable and harsh conditions, including intense evaporation and high concentrations of heavy metals and toxic metalloids, including arsenic (As). This study evaluated the bioremediation potential of As-resistant urease-producing bacteria isolated from the Loa River sediments to remove As via co-precipitation with calcite in a bioreactor. Preliminary, the bacterial community composition was characterized, using high-throughput Illumina sequencing of the 16 S rRNA genes. The bacterial community was dominated by Proteobacteria (49.09%), (mainly Delta-proteobacteria, Gamma-proteobacteria, and Alpha-proteobacteria), followed by Bacteroidetes (20.18%), and Firmicutes (16.3%). As-resistant bacteria producing urease were isolated. Most isolates (12/16) possessed the arsenate reductase gene and urease activity. Among them, the Shewanella sp. SLO-6 tolerated both arsenite (20 mM) and arsenate (100 mM), successfully removing 82% of total As via co-precipitation with calcite after 120 h incubation in a batch reactor. In addition, after 120 h, a significantly increased the viability (from 38 to 76%) of human umbilical vein endothelial cells; thus, effectively reducing arsenic toxicity. As removing by Shewanella sp. SLO-6 could be proposed as a component of bioreactors in the treatment of arsenic-contaminated waters to concomitantly counteract its harmful effects in aquatic environments.

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Cite

BibTeXRIS
BibTeX
@article{soto2026mitigation,
  title = {{Mitigation of arsenic toxicity in natural waters using a bacterial biomineralizing system}},
  author = {Ethel Soto and Claudia Vilo and Paulina Aguayo and Qunfeng Dong and Carlos T. Smith and Vincenzo Zammuto and Concetta Gugliandolo and Victor Guzman-Fierro and Victor L. Campos},
  journal = {Scientific Reports},
  year = {2026},
  month = jul,
  doi = {10.1038/s41598-026-60589-5},
  url = {https://doi.org/10.1038/s41598-026-60589-5},
  note = {CC BY},
}
RIS
TY  - JOUR
TI  - Mitigation of arsenic toxicity in natural waters using a bacterial biomineralizing system
AU  - Ethel Soto
AU  - Claudia Vilo
AU  - Paulina Aguayo
AU  - Qunfeng Dong
AU  - Carlos T. Smith
AU  - Vincenzo Zammuto
AU  - Concetta Gugliandolo
AU  - Victor Guzman-Fierro
AU  - Victor L. Campos
PY  - 2026
DA  - 2026/07/01
JO  - Scientific Reports
DO  - 10.1038/s41598-026-60589-5
UR  - https://doi.org/10.1038/s41598-026-60589-5
AB  - Rivers of the hyper-arid Atacama Desert (Northern Chile), including Loa River, are characterized by extremely variable and harsh conditions, including intense evaporation and high concentrations of heavy metals and toxic metalloids, including arsenic (As). This study evaluated the bioremediation potential of As-resistant urease-producing bacteria isolated from the Loa River sediments to remove As via co-precipitation with calcite in a bioreactor. Preliminary, the bacterial community composition was characterized, using high-throughput Illumina sequencing of the 16 S rRNA genes. The bacterial community was dominated by Proteobacteria (49.09%), (mainly Delta-proteobacteria, Gamma-proteobacteria, and Alpha-proteobacteria), followed by Bacteroidetes (20.18%), and Firmicutes (16.3%). As-resistant bacteria producing urease were isolated. Most isolates (12/16) possessed the arsenate reductase gene and urease activity. Among them, the Shewanella sp. SLO-6 tolerated both arsenite (20 mM) and arsenate (100 mM), successfully removing 82% of total As via co-precipitation with calcite after 120 h incubation in a batch reactor. In addition, after 120 h, a significantly increased the viability (from 38 to 76%) of human umbilical vein endothelial cells; thus, effectively reducing arsenic toxicity. As removing by Shewanella sp. SLO-6 could be proposed as a component of bioreactors in the treatment of arsenic-contaminated waters to concomitantly counteract its harmful effects in aquatic environments.
SN  - 2045-2322
ER  -