News

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)
5.6.2013
Author: ettler

Our new contribution to the Environmental Pollution journal reports effects of microbial reduction of Fe(III) and As(V) minerals at the Mokrsko geochemical anomaly that leads to mobilization of As and induces a mineralogical transition toward realgar formation. This is the first report of macroscopic realgar of biogenic origin!

Drahota P., Falteisek L., Redlich A., Rohovec J., Matoušek T., Čepička I. (2013): Microbial effect on the release and attenuation of arsenic in the shallow subsurface of a natural geochemical anomaly. Environmental Pollution 180, 84-91. (doi: 10.1016/j.envpol.2013.05.010)

22.3.2013
Author: ettler

Here, we reported first diel variations in dissolved concentrations of Mo in a stream. This phenomenon has been found in the As-rich stream at Mokrsko (Central Czech Rep.). Dissolved As, Mo, and Sb diel cycles were linked to temperature-dependend adsorption. Drahota P., Nováková B., Matoušek T., Mihaljevič M., Rohovec J., Filippi M. (2013): Diel variation of arsenic, molybdenum and antimony in a stream draining natural As geochemical anomaly. Applied Geochemistry 31, 84-93. (doi: 10.1016/j.apgeochem.2012.12.008)

22.3.2013
Author: ettler

In the December issue of Astrobiology, the "rapid communication" by Petr Vítek et al. reported about Raman spectroscopic identifications of microbial biomarkers in halite crusts from Atacama Desert using portable Raman systems. And we had a cover page!

Vítek P., Jehlička J., Edwards H.G.M., Hutchinson I., Ascaso C., Wierzchos J. (2012): Miniaturized Raman system and the detection of traces of life in halite from the Atacama Desert: some considerations for the search for life signatures on Mars. Astrobiology 12, 1095-1099. (http://online.liebertpub.com/toc/ast/12/12)


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