Intracellular trace metals content of iron and manganese of Phaeocystis antarctica after exposure to different Fe and Mn availabilities at the end of the experiment

For determination of the cellular trace metal content, at the end of the experiment 400 mL of water were filtered onto 0.2 μm TMC-cleaned polycarbonate filters (EMD Millipore, Darmstadt, Germany) and then rinsed for 15 min with a 0.1 M oxalic acid wash to remove cell surface bound trace metals. Finally, the filters were rinsed with filtered seawater and stored in 5 mL TMC polyfluoralkoxy vials until further analysis. Samples were analyzed with an inductively coupled plasma mass spectrometry (ICP-MS) following a digestion with nitric acid (HNO3) and HF.