1. Department of Analytical Chemistry; Faculty of Science, Pavol Jozef Šafárik University in Košice; Košice Slovakia
2. Department of Chemistry; University of Nyíregyháza; Nyíregyháza Hungary
3. Department of Analytical Chemistry; Uzhgorod National University; Uzhgorod Ukraine
4. Agricultural and Molecular Research and Service Institute; University of Nyíregyháza; Nyíregyháza Hungary