1. Department of Climatology and Atmosphere Protection, Institute of Geography and Regional Development, University of Wroclaw, ul. A. Kosiby 8, 51-670 Wroclaw, Poland
2. Department of Analytical Chemistry, Chemical Faculty, Gdansk University of Technology (GUT), ul. G. Narutowicza 11/12, 80-952 Gdańsk, Poland
3. Chair of Analytical Chemistry, Faculty of Chemistry, University of Sofia, J Bourchier Blvd. 1, 1164 Sofia, Bulgaria
4. Chair of Physical Chemistry, Faculty of Chemistry, University of Sofia, J Bourchier Blvd. 1, 1164 Sofia, Bulgaria