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For reason beyond the control of the authors or the editors, the article titled “Colloidal Organic Matter and Metal(loid)s in Coastal Waters (Gulf of Trieste, Northern Adriatic Sea)” by Katja Klun1 · Ingrid Falnoga2 · Darja Mazej2 · Primož Sket3 · Jadran Faganeli1 ( https://doi.org/10.1007/s10498-019-09359-6 ) was published in the regular issue Vol. 25 issue 5-6 instead of this special section, where it was originally scheduled to appear. Therefore, the full article is reprinted here.

Large volumes of seawater were sampled in the Gulf of Trieste (northern Adriatic Sea) in order to study the interactions between colloidal organic matter (COM) and metal(loid)s (Me) in coastal waters. COM (> 5 kDa) was isolated by ultrafiltration and characterized using 1H NMR spectroscopy and elemental Corg. and Ntot. analyses. COM in the gulf represents about one quarter of the dissolved organic carbon (DOC), and according to 1H NMR analysis, it is composed of polysaccharides (30–45%), lipids (30–55%), proteins and carboxyl-rich alicyclic molecules (CRAM) (15–20%), and humics (