Projects per year
Abstract
Tellurium (Te) is a Critical Element that is toxic to microorganisms and humans alike, most notably in its soluble oxyanionic forms. To date, the biogeochemical behaviour of Te in Earth's surface environment is largely unknown. Here, we report the discovery of elemental Te nanoparticles (Te NPs) in regolith samples using Single-Particle Inductively Coupled Plasma Mass Spectroscopy. Tellurium NPs were detected in both proximal and distal locations (bulk concentrations >4 ppm) relative to weathering Te ores. Synchrotron X-ray Fluorescence Mapping and X-ray Absorption Spectroscopy showed that bulk Te in the regolith is generally associated with Fe (oxyhydr)oxides and clay minerals, and mostly found in the oxidation states +IV and +VI. Although Te NPs account for less than 2 mol‰ of Te in our samples, their detection provides evidence for the active biogeochemical cycling of Te in surface environments. Te NPs are reactive and are likely to have formed in situ in distal samples, most likely via microbially-mediated reduction. Hence, the presence of Te NPs indicates the potential for release of toxic soluble forms of Te even in environments where most Te is “fixed” in forms such as Fe (oxyhydr)oxides that have low solubility and poor bioavailability.
| Original language | English |
|---|---|
| Article number | 100053 |
| Number of pages | 8 |
| Journal | Journal of Hazardous Materials Letters |
| Volume | 3 |
| DOIs | |
| Publication status | Published - Nov 2022 |
Keywords
- Biogeochemistry
- Mineral transformations
- Moctezuma, Sonora, Mexico
- Nanoparticles
- Tellurium
Projects
- 1 Finished
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The Australian Copper-Uranium Transformation Research Hub
Grano, S. (Primary Chief Investigator (PCI)), Ottaway, D. J. (Chief Investigator (CI)), Ngothai, Y. (Chief Investigator (CI)), Ashman, P. (Chief Investigator (CI)), Ebendorff-Heidepriem, H. (Chief Investigator (CI)), Hooker, A. (Chief Investigator (CI)), Brugger, J. (Chief Investigator (CI)), Wilson, S. (Chief Investigator (CI)), Pring, A. S. (Partner Investigator (PI)), Hayes, P. (Chief Investigator (CI)), Peng, Y. (Chief Investigator (CI)), Vaughan, J. W. (Chief Investigator (CI)), Jak, E. (Chief Investigator (CI)), Ehrig, K. (Partner Investigator (PI)), Spooner, N. (Partner Investigator (PI)) & Simons, S. (Partner Investigator (PI))
ARC - Australian Research Council, University of Adelaide, Monash University, Flinders University, University of Queensland , BHP Group Limited, OZ Minerals Limited, Department for Industry, Innovation and Science (South Australia)
2/06/15 → 30/06/20
Project: Research
Equipment
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Monash Centre for Electron Microscopy (MCEM)
Sorrell, F. (Manager) & Miller, P. (Manager)
Office of the Vice-Provost (Research and Research Infrastructure)Facility/equipment: Facility
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Monash X-ray Platform (MXP)
Ma, J. S. (Manager)
Materials Science & EngineeringFacility/equipment: Facility