Benzothiaoxacrown compounds with different numbers of sulfur and oxygen donor atoms (between 4 to 7 donors) dissolved in an organic diluent selectively extract the soft metal ions Ag(I) and Hg(II) from a mixture of Co(II), Ni(II), Cu(II), Zn(II), Ag(I) and Hg(II) present in an aqueous phase. Generally, the extraction efficiency depends on the specific structure of the benzothiaoxacrowns, on the organic diluent employed, as well as on the counter ion present in the aqueous phase. High extractions of Ag(I) and Hg(II) were achieved with all ligands from perchlorate and picrate aqueous media into nitrobenzene organic solutions. In the case of Cu(I) the extraction is significant lower; only ligand 5 with the O 2 S 4 donor atom set gives a moderate extractability. The composition of the extracted complexes depends on the crown ring size and ranges from 1:1 to 1:2 (M:L). Polarographic, UV-Vis and ESI mass spectrometric studies provide a further insight into the complex formation behavior.

Vorgestellt wird die Totaloxidation flüchtiger organischer Komponenten in Gegenwart von innovativen Katalysatoren in der Gasphase. Diese bestehen aus Nickelschaum mit einer c-Al 2 O 3 -Basisschicht, als Aktivkomponente wird zum einen ein silberhaltiger Perowskit, zum anderen Platin verwendet. Beide Katalysatoren zeigen hohe Aktivität bei relativ niedrigen Reaktionstemperaturen bis zu 300°C. Die Modelledukte werden nahezu quantitativ umgesetzt.

Thiobacillus ferroDxidans and thiobacillus thiooxidans have a main effect on the oxidation of copper sulfide ores. Properties of water percolated through the bed of the Open Pit of Erdenet Mining Corporation are different from that of surface water by its chemical composition, which creates a favorable environment for the life of thiobacillus. However, number and activeness of thiobacillus in percolated water do not reach a sufficient level to use them directly as an oxidizer of sulfides in bioleaching practice.It is possible to determine optimal conditions for reproduction of thiobacillus through an experiment and to increase the number ofthiobacillus in percolated water up to 45 x 1(j8 -70 x 10 10 celVml or 2.5-3 x 1()6 times.