Geochemistry and potential environmental impact of the mine tailings at Rosh Pinah, southern Namibia
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F15%3A00111296" target="_blank" >RIV/00216224:14310/15:00111296 - isvavai.cz</a>
Alternative codes found
RIV/60460709:41210/15:67440 RIV/00216208:11310/15:10306921 RIV/61989592:15310/15:33153656 RIV/00025798:_____/15:00000186
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S1464343X15000242" target="_blank" >https://www.sciencedirect.com/science/article/pii/S1464343X15000242</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.jafrearsci.2015.02.005" target="_blank" >10.1016/j.jafrearsci.2015.02.005</a>
Alternative languages
Result language
angličtina
Original language name
Geochemistry and potential environmental impact of the mine tailings at Rosh Pinah, southern Namibia
Original language description
Mine tailings at Rosh Pinah located in semiarid southern Namibia were investigated by the combination of mineralogical methods and leaching using water and simulated gastric solution. They are well-neutralized with leachate pH > 7 and neutralization potential ratios (NPR) up to 4. Neutralization is mainly due to abundant Mn-rich dolomite in the matrix. Concentrations of released contaminants in water leachate follow the order Zn > Pb > Cu > As. Relatively high leached concentrations of Zn and partly also of Pb are caused by their link to relatively soluble carbonates and Mn-oxyhydroxides. In contrast, As is almost immobile by binding into Fe-oxyhydroxides, which are resistant to dissolution. Barium is released by the dissolution of Ba-carbonate (norsethite) and precipitates in sulfate-rich pore water as barite. Dissolved concentrations in neutral mine drainage water collected in the southern pond are low, but when total concentrations including colloidal fraction are taken into account, more than 70% of Zn is in colloidal form. Groundwater upgradient of the mine tailings is of poor quality and there seems to be no negative impact on groundwater downgradient from mine tailings. Contaminant concentrations in simulated gastric leachates are in the order Ba > Pb > Zn > Cu > As with a maximum gastric bioaccessibility of 86.6% for Ba and a minimum of 3.3% for As. These results demonstrate that total contaminant content and toxicity in the solid phase are poor predictors of risk, and therefore mineralogical and bioavailability/bioaccessibility studies are necessary for evaluation of contaminant environmental impact.
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
—
OECD FORD branch
10505 - Geology
Result continuities
Project
—
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2015
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of African Earth Sciences
ISSN
1464-343X
e-ISSN
1879-1956
Volume of the periodical
105
Issue of the periodical within the volume
MAY
Country of publishing house
GB - UNITED KINGDOM
Number of pages
12
Pages from-to
17-28
UT code for WoS article
000353737000002
EID of the result in the Scopus database
2-s2.0-84924248824