Contaminant bioaccessibility in abandoned mine tailings in Namibia changes along a climatic gradient

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60460709%3A41210%2F25%3A101858" target="_blank" >RIV/60460709:41210/25:101858 - isvavai.cz</a>

Result on the web

<a href="https://pubs.rsc.org/en/content/articlehtml/2025/em/d5em00060b" target="_blank" >https://pubs.rsc.org/en/content/articlehtml/2025/em/d5em00060b</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1039/d5em00060b" target="_blank" >10.1039/d5em00060b</a>

Result language

angličtina

Original language name

Contaminant bioaccessibility in abandoned mine tailings in Namibia changes along a climatic gradient

Original language description

Fine-grained dust from tailing storage facilities in abandoned sulfide-ore mining areas represents an important source of environmental contamination. Fine fractions (<48 µm and <10 µm) of tailings from three old mining sites situated along a climatic gradient from hot semiarid to cold desert conditions in Namibia were studied: Kombat (Cu–Pb–Zn; rainfall ~500 mm), Oamites (Cu; ~120 mm), Namib Lead & Zinc (Pb–Zn; ~0 mm). Multi-method mineralogical and geochemical investigations were adopted to assess the binding and gastric bioaccessibility of the metal(loid)s and to evaluate the associated human health risks. The total concentrations of contaminants in the tailings generally increased with the decreasing particle size (up to 134 mg As kg-1, 14[thin space (1/6-em)]900 mg Cu kg-1, 8880 mg Pb kg-1, 13[thin space (1/6-em)]300 mg Zn kg-1). The mean bioaccessible fractions varied substantially between the sites and were significantly higher for the tailings from the sites with a higher rainfall (73–82% versus 22%). The mineralogical composition of the tailings, reflecting the original mineralogy and the degree of the weathering process, is the main driver controlling the bioaccessibility of the metal(loid)s. In desert environments, metal(loid)s in tailings are bound in sulfides or sequestered in secondary Fe oxyhydroxides and/or Fe hydroxysulfates, all of which are insoluble in simulated gastric fluid. In contrast, tailings from areas with higher precipitation contain metal(loid)s hosted in carbonate phases (malachite, cerussite), which are highly soluble under gastric conditions. Based on the higher contaminant bioaccessibility, the vicinity of the settlement and farmlands, and a higher percentage of wind-erodible fine particles, a higher risk for human health has thus been identified for the Kombat site, where further remediation of the existing tailings storage facility is highly recommended.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

20701 - Environmental and geological engineering, geotechnics

Project

<a href="/en/project/GA23-05051S" target="_blank" >GA23-05051S: Metals and their isotopes in active and abandoned mining areas of sub-Saharan Africa – towards understanding of their geochemistry and impacts</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Publication year

2025

Confidentiality

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

Name of the periodical

Environmental Science-Processes & Impacts

ISSN

2050-7895

e-ISSN

2050-7895

Volume of the periodical

27

Issue of the periodical within the volume

4

Country of publishing house

GB - UNITED KINGDOM

Number of pages

15

Pages from-to

1088-1102

UT code for WoS article

001451109000001

EID of the result in the Scopus database

2-s2.0-105001188347