title: Editorial.
authors.affiliation: Associate Professor, Department of Chemistry, National and Kapodistrian University of Athens, Greece. Electronic address: ntho@chem.uoa.gr.
authors.forename: Nikolaos S
authors.initials: NS
authors.lastname: Thomaidis
authors.affiliation: Department of Environment Chemistry, Eawag: Swiss Federal Institute of Aquatic Science and Technology & Institute of Biogeochemistry and Pollutant Dynamics, ETH Zurich, Switzerland. Electronic address: Juliane.Hollender@eawag.ch.
authors.forename: Juliane
authors.initials: J
authors.lastname: Hollender
authors.affiliation: Associate Professor, Department of Environment, University of the Aegean, Greece. Electronic address: astas@env.aegean.gr.
authors.forename: Athanasios S
authors.initials: AS
authors.lastname: Stasinakis