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2 · 4H 2O), hydroxylammonium chloride, and Eppendorf ultrafiltration tubes with a molecular weight cut-off (MWCO) of 3 kDa were purchased from Merck (Darmstadt, Germany). Iron reference standards 1 g/L were bought from Bernd Kraft GmbH (Duisburg, Germany). Iron (III) chloride hexahydrate (FeCl 3 · 6H 2O), dialysis tubes (Spectrapor 6, MWCO 8 kDa), sterile Rotilabo ® syringe filters with cellulose mixed ester membranes were supplied by Roth (Karlsruhe, Germany). Spectra/Por ® 6 dialysis tubi...