Oral bioaccessibility of metal(loids)s in dust materials from mining areas of northern Namibia
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F19%3A00000112" target="_blank" >RIV/00025798:_____/19:00000112 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1016/j.envint.2018.12.027" target="_blank" >https://doi.org/10.1016/j.envint.2018.12.027</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.envint.2018.12.027" target="_blank" >10.1016/j.envint.2018.12.027</a>
Alternative languages
Result language
angličtina
Original language name
Oral bioaccessibility of metal(loids)s in dust materials from mining areas of northern Namibia
Original language description
Ore mining and processing in semi-arid areas is responsible for the generation of metal(loid)-containing dust,which is easily transported by wind to the surrounding environment. To assess the human exposure to dustderivedmetal(loid)s (As, Cd, Cu, Pb, Sb, Zn), as well as the potential risks related to incidental dust ingestion, westudied mine tailing dust (n=8), slag dust (n=5) and smelter dust (n=4) from old mining and smelting sitesin northern Namibia (Kombat, Berg Aukas, Tsumeb). In vitro bioaccessibility testing using extraction in simulatedgastric fluid (SGF) was combined with determination of grain-size distributions, chemical and mineralogicalcharacterizations and leaching tests conducted on original dust samples and separated PM10 fractions. The bulkand bioaccessible concentrations of the metal(loid)s were ranked as follows: mine tailing dusts < slagdusts≪smelter dusts. Extremely high As and Pb bioaccessibilities in the smelter dusts were caused by thepresence of highly soluble phases such as arsenolite (As2O3) and various metal-arsenates unstable under theacidic conditions of SGF. The exposure estimates calculated for an adult person of 70 kg at a dust ingestion rateof 50 mg/day indicated that As, Pb (and also Cd to a lesser extent) grossly exceeded tolerable daily intake limitsfor these contaminants in the case of slag and smelter dusts. The high risk for smelter dusts has been acknowledged,and the safety measures currently adopted by the smelter operator in Tsumeb are necessary toreduce the staff's exposure to contaminated dust. The exposure risk for the local population is only important atthe unfenced disposal sites at Berg Aukas, where the PM10 exhibited high levels of bioaccessible Pb.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10505 - Geology
Result continuities
Project
<a href="/en/project/GA16-13142S" target="_blank" >GA16-13142S: Mining and processing of Cu, Pb, Zn and Co ores in Sub-Saharan Africa – natural geochemical laboratories for investigation of pollutant behaviours</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Environment International
ISSN
0160-4120
e-ISSN
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Volume of the periodical
124
Issue of the periodical within the volume
March
Country of publishing house
US - UNITED STATES
Number of pages
11
Pages from-to
205-215
UT code for WoS article
000457122700021
EID of the result in the Scopus database
2-s2.0-85059839483