1. Department of Environmental Chemistry and Ecotoxicology, University of Gdańsk, 18 Sobieskiego Street, PL 80-952 Gdańsk, Poland, Hydrochemistry Section, Division of Environmental Conservation, National Research Institute of Fisheries and Environment of Inland Sea, Marushi 2-17-5, Ohno-cho, Hiroshima 739-042, Japan, Department of Analytical Chemistry, University of Gdańsk, 18 Sobieskiego Street, PL 80-952 Gdańsk, Poland, and Faculty of Agriculture, Tohoku University, Tsutsumi-Dori-Amaniya-cho 1-1, Sendai...