News

16.10.2014
Author: ettler

On Monday November 10, 2014, we have pleasure to invite you for a lecture on “Weathering, ocean chemistry and climate change: New insights from non-traditional metal stable isotopes” given by Dr. Rachael James from University of Southampton, United Kingdom.

The lecture will take place in the lecture room of Velká paleontologická, Albertov 6, Praha 2, ground floor and is suitable for MSc and PhD students. (web, PDF flyer)

16.10.2014
Author: ettler

Together with our colleagues from the University of Jena and Academy of Science, we published extended review on parageneses and crystalochemistry of arsenic minerals. It has been included in the recent issue of Reviews in Mineralogy & Geochemistry that is related to the environmental geochemistry, mineralogy, and microbiology of arsenic (http://www.minsocam.org/msa/rim/rim79.html).

Majzlan J., Drahota P., Filippi M. (2014): Parageneses and crystal chemistry of arsenic minerals. In: Bowell R.J., Alpers C.N., Jamieson H.E., Nordstrom D.K., Majzlan J. (eds.) Arsenic: Environmental geochemistry, mineralogy, and microbiology. Reviews in Mineralogy & Geochemistry 79, 17-184. (ISBN 978-0-939950-94-2). (link

16.10.2014
Author: ettler

Several sequential extraction schemes (SES) have been designed by previous research to fractionate in soils and sediment, but none of these schemes have been evaluated for their suitability for As-rich mine wastes. In our new paper, we developed and tested optimized SES for As fractionation over a range of pure As minerals, their model mixtures, and natural mine waste materials. The results showed that the optimized SES can reliably be employed for As partitioning in mine wastes.

Drahota P., Grösslová Z., Kindlová H. (2014): Selectivity assessment of an arsenic sequential extraction procedure for evaluating mobility in mine waste. Analytica Chimica Acta 839, 34-43. (doi: 10.1016/j.aca.2014.06.022)

 

16.1.2014
Author: ettler

Metallurgical slags are often considered as hazardous materials, but leaching tests traditionally used for waste assessment generally show very low leaching of metals and metalloids. We recently reported results on long-term leaching of Pb slags (12 years) and demonstrated which geochemical and mineralogical mechanisms are governing the release of contaminants from slags. We also underline the need of investigation of other contaminants in slags (e.g. Ba), which have been overlooked so far. Our another paper was focused on the geochemical and mineralogical transformation of slags within a heap and indicated that slag dumps can be considered as relatively stable and confined environments and their mechanical disturbance can lead to an increased release of contaminants.

Ettler V., Johan Z. (2014): 12 years of leaching of contaminants from Pb smelter slags: Geochemical/mineralogical controls and slag recycling potential. Applied Geochemistry 40, 97-103. (doi: 10.1016/j.apgeochem.2013.11.001), Tyszka R., Kierzcak J., Pietranik A., Ettler V., Mihaljevič M. (2014): Extensive weathering of zinc smelting slag in a heap in Upper Silesia (Poland): Potential environmental risks posed by mechanical disturbance of slag deposits. Applied Geochemistry 40, 70-81. (doi: 10.1016/j.apgeochem.2013.10.010)

16.1.2014
Author: ettler

Manganese oxides are known to be efficient sorbents and are useful in remediation of polluted soils. Here we studied the stability of a novel synthetic amorphous manganese oxides (AMO) in contrasting soils. Up to 18% of AMO dissolved in acidic soils and carbonates (rhodochrosite) formed on the AMO surfaces under circumneutral conditions. AMO is definitely more suitable for chemical stabilization of less acidic and neutral soils and its remediation potential must be investigated further. Ettler V., Knytl V., Komárek M., Della Puppa L., Bordas F., Mihaljevič M., Klementová M., Šebek O. (2013): Stability of a novel synthetic amorphous manganese oxide in contrasting soils. Geoderma 214-215, 2-9. (doi: 10.1016/j.geoderma.2013.10.011)

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