Impact of fungal exposure on structural and chemical alterations in ferrihydrite-goethite associations: Implications for metal mobility and environmental risks

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F25%3A00389700" target="_blank" >RIV/68407700:21340/25:00389700 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1016/j.chemgeo.2025.123145" target="_blank" >https://doi.org/10.1016/j.chemgeo.2025.123145</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.chemgeo.2025.123145" target="_blank" >10.1016/j.chemgeo.2025.123145</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Impact of fungal exposure on structural and chemical alterations in ferrihydrite-goethite associations: Implications for metal mobility and environmental risks

Popis výsledku v původním jazyce

The precipitation of ochreous materials at abandoned mining sites plays a key role in immobilizing hazardous metals and metalloids from mine drainage waters due to their high sorption capacity and surface reactivity. However, their stability may be compromised by interactions with filamentous fungi, a metal-tolerant microbial group capable of altering their chemical and structural properties. Such changes can increase contaminant mobility, posing ecological risks. Therefore, this study aims to investigate the elemental and structural characteristics of ochreous sediments and evaluates the impact of fungal bioleaching by fungus Aspergillus niger. Using Mossbauer spectroscopy, three ferric iron forms were identified, indicating a highly disordered ferrihydrite (outer layer of crystallite), ferrihydrite with lower degree of distortion (core) and a goethite-like phase. Fungal exposure resulted in nanoscale structural changes, particularly in less ordered ferric sites. Bioleaching led to significant iron extraction, leading to the release of hazardous elements, particularly arsenic, antimony, nickel, copper, and manganese. Simultaneously, structural transformations occurred, including the dissolution of goethite-like phases and less ordered ferric iron sites within ferrihydrite. These findings enable us to propose a structural model of ferrihydrite-goethite associations, suggesting that the spatial structure of each phase, rather than the inherent structural stability of the crystallites, plays a significant role in their mineralogical and chemical resilience and leachability.

Název v anglickém jazyce

Impact of fungal exposure on structural and chemical alterations in ferrihydrite-goethite associations: Implications for metal mobility and environmental risks

Popis výsledku anglicky

The precipitation of ochreous materials at abandoned mining sites plays a key role in immobilizing hazardous metals and metalloids from mine drainage waters due to their high sorption capacity and surface reactivity. However, their stability may be compromised by interactions with filamentous fungi, a metal-tolerant microbial group capable of altering their chemical and structural properties. Such changes can increase contaminant mobility, posing ecological risks. Therefore, this study aims to investigate the elemental and structural characteristics of ochreous sediments and evaluates the impact of fungal bioleaching by fungus Aspergillus niger. Using Mossbauer spectroscopy, three ferric iron forms were identified, indicating a highly disordered ferrihydrite (outer layer of crystallite), ferrihydrite with lower degree of distortion (core) and a goethite-like phase. Fungal exposure resulted in nanoscale structural changes, particularly in less ordered ferric sites. Bioleaching led to significant iron extraction, leading to the release of hazardous elements, particularly arsenic, antimony, nickel, copper, and manganese. Simultaneously, structural transformations occurred, including the dissolution of goethite-like phases and less ordered ferric iron sites within ferrihydrite. These findings enable us to propose a structural model of ferrihydrite-goethite associations, suggesting that the spatial structure of each phase, rather than the inherent structural stability of the crystallites, plays a significant role in their mineralogical and chemical resilience and leachability.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10301 - Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)

Projekt

<a href="/cs/project/LM2023073" target="_blank" >LM2023073: Jaderné experimentální centrum VR-1</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Chemical Geology

ISSN

0009-2541

e-ISSN

1872-6836

Svazek periodika

698

Číslo periodika v rámci svazku

123145

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

12

Strana od-do

—

Kód UT WoS článku

001618834100001

EID výsledku v databázi Scopus

2-s2.0-105024072545