Fig. 4. Concentrations of 71 PAH in OL (top) and CL (bottom) discharge water samples (dissolved fraction) of the four ships. 1,8-Dimethylnaphthalene, retene, cyclopenta[cd]pyrene, 4-methylchrysene, 3-methylcholanthrene, indeno[1,2,3-cd]fluoranthene, 6-methylbenzo[a]pyrene, indeno[1,2,3,-cd]pyrene, naphtho[2,3-b] fluoranthene, naphtho[2,3-k]fluoranthene, naphtho[2,3-a]pyrene, dibenzo[a,i]pyrene and dibenzo[a,h]pyrene were below the detection limit. 1-Methylfluoranthene and 3-methylfluoranthene as well as naphtho[2,3-b]fluoranthene and dibenzo[a,e]fluoranthene coeluted. The group of naphthalenes (left) and phenanthrenes/an- thracenes (right) are marked by boxes. HMW PAH are shown in zoomed boxes because of their low concentrations (first columns shown are for Flu; for details see Suppl. Inform. S4). C. Achten et al. Marine Pollution Bulletin 208 (2024) 116790 7