Sven Pallacks¹, Griselda Anglada I Ortiz¹, Alex Fernandez Espéjo¹, P. Graham Mortyn¹, Michael Grelaud¹, Belen Martrat², Alessandro Incarbona³, Ralf Schiebel⁴, Jordi Garcia-Orellana¹ and Patrizia Ziveri^1,5, (1)Institute of Environmental Science and Technology, Universitat Autònoma de Barcelona, Barcelona, Spain, (2)Institute of Environmental Assessment and Water Research (IDAEA), Barcelona, Spain, (3)University of Palermo, Italy, (4)Max Planck Institute for Chemistry, Mainz, Germany, (5)ICREA, Barcelona, Spain