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Concentrations and distribution of phthalate esters in the seamount area of the Tropical Western Pacific Ocean
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Researchers investigated phthalate ester (PAE) concentrations in seawater at the M2 seamount in the Tropical Western Pacific Ocean, finding total PAE concentrations ranging from 12.13 to 60.69 ng/L and dominated by DBP, DEHP, and DiBP. The spatial distribution of PAEs was shaped by current-seamount interactions, with lower concentrations above the seamount summit.
A total of 14 phthalate esters (PAEs) were analysed by gas chromatography-mass spectrometry (GC-MS) to better understand its occurrence and distribution in seawater samples of M2 seamount in the Tropical Western Pacific Ocean (TWPO). The concentrations of ΣPAEs in the seawater ranged from 12.13 ng L to 60.69 ng L (av. 28.86 ng L), dominated by dibutyl phthalate (DBP), di(2‑ethylhexyl) phthalate (DEHP) and diisobutyl phthalate (DiBP). ΣPAEs concentrations in the southwest of the seamount were lower than those in the northeast, with the minima appearing above the seamount summit. Current-seamount interaction was reckoned to be the principal driving factors in the distribution of PAEs. DEHP posed a medium risk in seawater, suggesting that marine plastic pollution has become an urgent environmental issue that calls for more attention and actions. Microplastics leaching and atmospheric deposition might be the potential sources of PAEs.
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