1. Division for Marine and Environmental Research; Rudjer Boskovic, Institute; P.O. Box 180 HR-10002 Zagreb Croatia
2. Department of Inorganic and Analytical Chemistry; University of Lodz; Tamka 12 91-403 Lodz Poland
3. Institute of Chemistry, Faculty of Natural Sciences and Mathematics; “Ss Cyril and Methodius” University; P.O. Box 162 1000 Skopje R. Macedonia