1Department of Ecology and Environmental Protection, Poznań University of Life Sciences,
Piątkowska 94C, 60-649 Poznań, Poland
2Department of Trace Element Analysis by Spectroscopy Method, Adam Mickiewicz University,
Umultowska 89b, 61-614 Poznań, Poland
3Department of Mathematical and Statistical Methods, Poznań University of Life Sciences,
Wojska Polskiego 28, 60-637 Poznań, Poland
Pol. J. Environ. Stud. 2014;23(3):681–688