Pore water geochemistry of sediment core Potter_Cove_STA15

Methods:Sampling:• Rhizon technique (Seeberg-Elverfeldt et al. 2005)SO42-:• Ion chromatography (Metrohm IC Net 2.3)Fe2+:• Ferrozine method (Stookey 1970)NH4+:• spectrophotometrically using a Multiskan microplate readerAlkalinity:• Spectrophotometrically after Sarazin et al. (1999) using a Multiskan microplate readerδ56Fe(pw):• Removal of salt matrix by column chromatography (NTA Superflow columns, Qiagen) (Lohan et al. 2005)• Column separation using the Dowex 1X8 resin• Isotope analysis on a ThermoFinnigan Neptune Multicollector-ICP-MS (ESI Apex-Q desolvator, standard-sample bracketing method with IRMM-014) (Schoenberg and von Blanckenburg 2005)