Multi-walled carbon nanotubes - Solid phase extraction for isolating marine dissolved organic matter before characterization by size exclusion chromatography

► Multi-walled carbon nanotubes (MWCNTs) for isolating marine dissolved organic matter (DOM). ► Effect of the saline matrix and the solid phase extraction mode on the retained DOM ratio. ► Size exclusion chromatography for characterizing the retained DOM. ► Retained DOM onto MWCNTs is in low molecular weight (within the 125-1102 Da range).