关键元素碲的天然纳米粒子

IF 6.6 Q1 ENGINEERING, ENVIRONMENTAL Journal of hazardous materials letters Pub Date : 2022-11-01 DOI:10.1016/j.hazl.2022.100053
Owen P. Missen , Ella R. Lausberg , Joël Brugger , Barbara Etschmann , Stuart J. Mills , Koichi Momma , Rahul Ram , Mihoko Maruyama , Xi-Ya Fang , Erik Melchiorre , Christopher G. Ryan , Edgar E. Villalobos-Portillo , Hiram Castillo-Michel , Kiyofumi Nitta , Oki Sekizawa , Jeremiah Shuster , Santonu K. Sanyal , Andrew Frierdich , Steve Hunt , Yuka Tsuri , Maria A.D. Rea
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引用次数: 2

摘要

碲(Te)是一种对微生物和人类都有毒的关键元素,最明显的是其可溶性氧阴离子形式。迄今为止,Te在地球表面环境中的生物地球化学行为在很大程度上是未知的。在这里,我们报告了使用单粒子电感耦合等离子体质谱在风化层样品中发现元素Te纳米颗粒(Te NPs)。相对于风化Te矿石,在近端和远端位置均检测到碲NPs(体积浓度> 4ppm)。同步加速器x射线荧光成像和x射线吸收光谱分析表明,大块Te在风化层中普遍与Fe(氧合)氧化物和粘土矿物伴生,且多以+IV和+VI氧化态存在。虽然NPs在样品中所占的比例不到2 mol‰,但它们的检测为Te在地表环境中活跃的生物地球化学循环提供了证据。NPs是活性的,很可能是在远端样品中原位形成的,很可能是通过微生物介导的还原。因此,Te NPs的存在表明,即使在大多数Te以低溶解度和生物利用度差的铁(氧合)氧化物等形式“固定”的环境中,也有可能释放出有毒的可溶性Te。
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Natural nanoparticles of the critical element tellurium

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.

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来源期刊
Journal of hazardous materials letters
Journal of hazardous materials letters Pollution, Health, Toxicology and Mutagenesis, Environmental Chemistry, Waste Management and Disposal, Environmental Engineering
CiteScore
10.30
自引率
0.00%
发文量
0
审稿时长
20 days
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