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154977 - Natural nanoparticles of the critical element tellurium (1).pdf (5.25 MB)

Natural nanoparticles of the critical element tellurium

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posted on 2023-05-21, 15:55 authored by Owen MissenOwen Missen, Lausberg, ER, Brugger, J, Etschmann, B, Mills, SJ, Momma, K, Ram, R, Maruyama, M, Fang, X-Y, Melchiorre, E, Ryan, CG, Villalobos-Portillo, EE, Castillo-Michel, H, Nitta, K, Sekizawa, O, Shuster, J, Sanyal, SK, Frierdich, A, Hunt, S, Tsuri, Y, Takahashi, Y, Michibata, U, Dwivedi, S, Rea, MA
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.

History

Publication title

Journal of Hazardous Materials Letters

Article number

100053

Number

100053

Pagination

1-8

ISSN

2666-9110

Department/School

School of Natural Sciences

Publisher

Elsevier BV

Place of publication

Netherlands

Rights statement

© 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY Attribution 4.0 International license (CC BY 4.0) (http://creativecommons.org/licenses/by/4.0/).

Repository Status

  • Open

Socio-economic Objectives

Environmentally sustainable mineral resource activities not elsewhere classified; Other mineral resources (excl. energy resources) not elsewhere classified; Expanding knowledge in the earth sciences

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