1 Accumulation of Perfluoroalkylated Substances in Oceanic Plankton SUPPORTING INFORMATION Paulo Casal 1 , Belén González-Gaya 1,2 , Yifeng Zhang 3 , Anthony J.F. Reardon 3 , Jonathan W. Martin 3 , Begoña Jiménez 2 , and Jordi Dachs 1* 1 Institute of Environmental Assessment and Water Research, Spanish National Research Council (IDAEA-CSIC), Jordi Girona 18-26, 08034 Barcelona, Catalonia, Spain 2 Department of Instrumental Analysis and Environmental Chemistry, Institute of Organic Chemistry (IQOG-CSIC), Juan de la Cierva 3, 28006 Madrid, Spain 3 Division of Analytical and Environmental Toxicology, Department of Laboratory Medicine and Pathology, University of Alberta, Edmonton, Alberta Canada * Corresponding author email: jordi.dachs@idaea.csic.es