Distribution and Chemical Speciation of Molybdenum in River and Pond Sediments Affected by Mining Activity in Erdenet City, Mongolia
| Autor: | Davaasuren Davaadorj, Gankhurel Baasansuren, Odgerel Enkhjin, Yoshio Takahashi, Akitoshi Akehi, Tsetsgee Solongo, Ochir Altansukh, Yunden Ariuntungalag, Keisuke Fukushi, Noriko Hasebe, Boldbaatar Davaajargal |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
lcsh:QE351-399.2
XAFS chemistry.chemical_element 010501 environmental sciences Molybdate 010502 geochemistry & geophysics 01 natural sciences Ferrihydrite chemistry.chemical_compound molybdenum sequential extraction 0105 earth and related environmental sciences lcsh:Mineralogy Aquatic ecosystem Extraction (chemistry) Sediment Geology Geotechnical Engineering and Engineering Geology chemical speciation Tailings X-ray absorption fine structure chemistry sediment Molybdenum Environmental chemistry Erdenet mine Environmental science |
| Zdroj: | Minerals, Vol 8, Iss 7, p 288 (2018) Minerals Volume 8 Issue 7 |
| Popis: | Rivers and ponds near the Erdenet mine, one of the world&rsquo s largest copper-molybdenum mines, exhibit high concentrations of molybdenum (Mo). This study evaluates the distribution and chemical speciation of Mo in surface sediments from ponds and rivers in Erdenet city to elucidate the mobility and solubility of Mo in the surface aquatic environments in the area. The waters and sediments were collected in two shallow ponds connected to the tailing pond and from three rivers flowing through Erdenet city. The distribution and chemical speciation of Mo in the sediments were examined using five-step sequential extraction and X-ray absorption fine structure (XAFS) analyses. The XAFS spectra of the sediments showed that large amounts of Mo in the sediments are molybdate or polymeric molybdate, weakly adsorbed onto ferrihydrite. Sequential extraction consistently showed a large amount of Mo distributed in the labile fractions. Results suggest that the surface sediments from ponds and rivers play a role as secondary contamination sources of Mo rather than as sinks of Mo in the area. |
| Databáze: | OpenAIRE |
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