Komunikacni politika v marketingu.

Available from STL Prague, CZ / NTK - National Technical LibrarySIGLECZCzech Republi

Occurrence of perfluoroalkyl substances (PFASs) in various food items of animal origin collected in four European countries

This study summarises the results of the levels of 21 perfluoroalkyl substances (PFASs) in 50 selected pooled samples representing 15 food commodities with the special focus on those of animal origin, as meat, seafood, fish, milk, dairy products and hen eggs, which are commonly consumed in various European markets, e.g. Czech, Italian, Belgian and Norwegian. A new, rapid sample preparation approach based on the QuEChERS extraction procedure was applied. Ultra-performance liquid chromatography (UHPLC) coupled to tandem mass spectrometry (MS/MS) employing electrospray ionisation (ESI) in negative mode was used for the quantification of target analytes. Method quantification limits (MQLs) were in the range of 1-10 ng kg−1 (ng l−1) for fish, meat, hen eggs, cheese and milk, and in the range of 2.5-125 ng kg−1 for butter. Only 16 of the group of 21 PFASs were found in at least one analysed sample. From 16 PFASs, perfluorooctane sulfonate (PFOS) was the most frequently detected analyte present in approximately 50% of samples (in the range of 0.98-2600 ng kg−1). PFCAs with C8-C14 carbon chain were presented in approximately 20% of samples. The concentration ranges of individual compounds in the respective groups of PFASs were: 2.33-76.3 ng kg−1 for PFSAs (without PFOS), 4.99-961 ng kg−1 for PFCAs, 10.6-95.4 ng kg−1 for PFPAs, and 1.61-519 ng kg−1 for FOSA. The contamination level in the analysed food commodities decreased in the following order: seafood > pig/bovine liver >> freshwater/marine fish > hen egg > meat >> butter. When comparing the total contamination and profiles of PFASs in food commodities that originated from various sampling countries, differences were identified, and the contents decreased as follows: Belgium >> Norway, Italy > Czech Republic

Purchasing power parity hypothesis: mixed evidence from eastern europe emerging markets

This paper investigates whether the purchasing power parity (PPP) hypothesis holds in the Czech Republic, Hungary, and Poland by considering currencies of their five largest trading partners. We employ eight panel unit root tests that can be arranged in groups by cross-section independence or dependence. Empirical findings show that the stochastic behavior of real exchange rates in the Czech Republic and Poland is not a mean reversion, and the PPP condition does not hold for them. However, we obtain mixed empirical evidence in Hungary. Limited evidence is found for validity of the PPP hypothesis among currencies of Hungary's largest trading partners