Dissolved organic matter and trace metals in solid-phase extracts of water samples from the Elbe-Weser estuary

Water samples were either acidified to pH 2 or processed without acidification (pH 8) prior solid-phase extraction (SPE). SPE was performed in quadruplicates. Thus, the given concentrations and elemental ratios of solid-phase extracts are average values of quadruplicate measurements (+/- standard deviation).Some values for SPE-V and SPE-As were below limit of detection (LOD).