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Physicochemical Problems of Mineral Processing; ISSN 2084-4735

Aims and objectives Methods and materials Results Conclusion Personal information References, Aims and objectives: To analyze CT-angiographic findings in patients with acute pulmonary embolism (APE) and echocardiographic features of right ventricular dysfunction...

Aims and objectives Methods and materials Results Conclusion Personal information References, Aims and objectives: To assess a prognostic value of pulmonary artery obstruction indices (PAOIs) in predicting a complicated clinical course of acute pulmonary embolism...

The examination of the distribution of rotifers and crustaceans between particular stations located within vegetated (zones of helophytes and nymphaeids) and unvegetated (open water area) zones of an oxbow lake situated within the River Odra valley was carried out during the period of high water level in April of 2007. The obtained results revealed a considerable species diversity along with low densities of particular zooplankton species, which are characteristic features for slightly humic waters. The most diverse species composition of rotifers was found in the littoral zone of the studied water body. This was probably due to the heterogeneity of the macrophyte-dominated area. Additionally, the presence of fish in the investigated oxbow lake may have been responsible for finding the greatest abundance of Crustacea in the zones dominated by aquatic vegetation.

We examined the electroreduction of Bi (III) ions in chlorate (VII) solutions under varied protonation conditions of the depolariser using voltammetric and impedance methods. The results of the kinetic parameter correlation lead to the statement that the changes in the amount of chloric (VII) acid against the amount of its sodium salt in the supporting electrolytes of the low water activity have a significant influence on the rate of Bi (III) ion electroreduction. The increase of the concentration of chloric acid sodium salt, as well as the chloric (VII) acid alone within the particular concentration of the supporting electrolyte, inhibits the process of Bi (III) ion electroreduction. It should be associated with the reorganisation of the structure of the double layer connected with the slow dehydration inhibited by ClO 4− ions. The standard rate constants ks values with the increase of the chlorate (VII) concentrations for all the solutions examined of chlorates (VII) confirms the catalytic influence of the decrease of water activity on the process of Bi (III) ion electroreduction. The multistage process is confirmed by the non-rectilinear 1nkf = f(E) dependences.