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| Titel |
Environmental impacts of Tl related to mined Dajiangping pyrite deposit in west Guangdong Province, China |
| VerfasserIn |
J. Liu, J. Wang, Y. H. Chen, J. Y. Qi, C. L. Wang |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250024577
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| Zusammenfassung |
| This study focuses on the accumulation of Tl in Dajiangping pyrite deposit area in west
Guangdong province, China, as a case study for environmental impacts of Tl due to natural
processes and human activities. The pyrite deposit is one of the largest in Asia and has been
mined on large scale since 1970s. Results show that Tl and other trace elements in local
ecosystems, such as rocks/ores, soils, surface and ground waters, water sediments, plants and
crops in Dajiangping near the pyrite ore deposit are enriched, characterized by high
concentrations. The range of Tl concentrations is from 13.7 to 43.0 mg/kg in chunk
concentrated ore, from 31.0 to 56.4 mg/kg in powdery concentrated ore and 49.7 to
51.6 mg/kg in pyrite tailing. Tl concentrations range from 15.0 to 21.0 mg/kg in
soils of mineralized area, from 7.4 to 30.5 mg/kg in alluvial deposits and from 1.2
to 2.0 mg/kg in undisturbed background soil. Elevated concentrations of Tl have
been observed in surface water from upstream( 2.2 µg/L) to downstream(102.6
µg/L) sections. Tl concentrations are comparatively high in the groundwater in
mineralized area ( 7.8 µg/L). Tl concentrations in the edible parts of plants and crops
range from 0.02 to 22.03 mg/kg (dry weight). Tl uptake shows characteristics of
species-dependent, more in vegetables (around 90 mg/kg) than crops (0.3-8.1 mg/kg).
For each individual plant, Tl concentrated more in roots than leaves and stems.
The enrichment of Tl in the local ecosystem might come from the weathering,
leaching and dissolving of Tl pyrite minerals. All this work adds new knowledge
to understand Tl behaviour in mined Tl-pyrite deposits, and also benefits to the
study on local environmental protection and mineral resources exploitation in the
future. |
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