Polycyclic aromatic hydrocarbons and their derivatives in sediments from the Okinawa Trough and South China Sea: Occurrence, sources, profiles, and implications for anthropogenic activities

Sediments from the Middle Okinawa Trough (MOT) and Southwest Basin were analyzed for polycyclic aromatic hydrocarbons (PAHs) and their halogenated and nitrated derivatives. No halogenated PAHs were detected, whereas 6 nitrated PAHs were observed in three samples from the MOT (0.960−6.46 ng/g). The c...

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Veröffentlicht in:Continental shelf research Jg. 285; S. 105406
Hauptverfasser: Li, Jin-Yun, Hou, Ye-Yang, Liao, Wan-Jun, Guo, Ying, He, Yong, Liu, Liang-Ying
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Elsevier Ltd 01.02.2025
Schlagworte:
Anthropogenic activities
Marine sediments
Nitrated PAHs
Polycyclic aromatic hydrocarbons
Marine sediments
Polycyclic aromatic hydrocarbons
Anthropogenic activities
Nitrated PAHs
ISSN:0278-4343
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Zusammenfassung:Sediments from the Middle Okinawa Trough (MOT) and Southwest Basin were analyzed for polycyclic aromatic hydrocarbons (PAHs) and their halogenated and nitrated derivatives. No halogenated PAHs were detected, whereas 6 nitrated PAHs were observed in three samples from the MOT (0.960−6.46 ng/g). The concentrations of Σ18PAH in the sediment of the MOT (average124 ng/g) were statistically higher than those of the Southwest Basin (39.7 ng/g). The MOT sediments were dominated by 4−5-ring PAHs, whereas the Southwest Basin sediments were dominated by 3-ring PAHs. The regional differences in concentrations and composition profiles were likely due to the different patterns of regional environmental and/or anthropogenic factors, e.g., climate and energy consumption. Sedimentary PAHs in the MOT were primarily derived from petroleum and/or petroleum combustion, while those in the Southwest Basin were mainly from petroleum. The findings suggest that environmental management and pollution control strategies should consider the specific pollution source in different regions. [Display omitted] •PAHs and their derivatives were measured in sediments from the Okinawa Trough and Southwest Basin.•The concentrations of PAHs and their derivatives in coastal ocean sediments were at the lower end.•Sedimentary PAH levels and profiles were different between the two study regions.•Anthropogenic activities and environmental factors both influence the pollution characteristics.
ISSN:0278-4343
DOI:10.1016/j.csr.2025.105406