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| Titel |
Mercury speciation on three European mining districts by XANES techniques |
| VerfasserIn |
J. M. Esbrí, E. M. Garcia-Noguero, B. Guerrero, D. Kocman, A. Bernaus, X. Gaona, P. Higueras, R. Alvarez, J. Loredo, M. Horvat, M. Ávila |
| 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 |
250021148
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| Zusammenfassung |
| The mobility, bioavailability and toxicity of mercury in the environment depend on the
chemical species in which is present in soil, sediments, water or air. In this work we used
synchrotron radiation to determine mercury species in geological samples of three mercury
mining districts: Almadén (Spain), Idria (Slovenia) and Asturias (Spain). The aim of this
study was to find differences on mobility and bioavailability of mercury on three mining
districts with different type of mineralization. For this porpoises we selected samples of ore,
calcines, soils and stream sediments from the three sites, completely characterized by the
Almadén School of Mines, Josef Stefan Institute of Ljubljana and Oviedo School of
Mines.
Speciation of mercury was carried out on Synchrotron Laboratories of Hamburg
(HASYLAB) by XANES techniques. Spectra of pure compounds [HgCl2, HgSO4,
HgO, CH3HgCl, Hg2Cl2 (calomel), HgSred (cinnabar), HgSblack (metacinnabar),
Hg2NCl0.5(SO4)0.3(MoO4)0.1(CO3)0.1(H2O) (mosesite), Hg3S2Cl2 (corderoite),
Hg3(SO4)O2 (schuetteite) y Hg2ClO (terlinguaite)] were obtained on transmittance mode.
The number and type of the compounds required to reconstruct experimental spectra for each
sample was obtained by PCA analysis and linear fitting of minimum quadratics of the pure
compounds spectra. This offers a semiquantitative approach to the mineralogical constitution
of each analyzed sample.
The results put forward differences on the efficiency of roasting furnaces from the three
studied sites, evidenced by the presence of metacinnabar on the less efficient (Almadén and
Asturias) and absence on the most efficient (Idria). For the three studied sites, sulfide species
(cinnabar and metacinnabar) were largely more abundant than soluble species (chlorides and
sulfates).
On the other hand, recent results on the mobility of both Hg and As on the target sites will
be presented. These results correlate with the related chemical species found by XANES
techniques. |
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