Preferential molecular fractionation of dissolved organic matter by iron minerals with different oxidation states

The biogeochemical cycles of iron and dissolved organic matter (DOM) are strongly associated, especially at different oxidation sates. However, the role of iron minerals with different oxidation states in DOM preservation has not been clearly characterized at the molecular level. In this study, we employed electrospray ionization coupled with Fourier-transform ion cyclotron resonance mass spectrometry (ESI-FT-ICR-MS) to investigate the molecular...