Persistence and photochemical transformation of water soluble constituents from industrial crude oil and natural seep oil in seawater

MARINE POLLUTION BULLETIN

卷:165

Article

Snyder, Kristen¹  Mladenov, Natalie¹  Richardot, William²  Dodder, Nathan²  Nour, Azin¹  Campbell, Cari¹  Hoh, Eunha² 

[1] San Diego State Univ, Dept Civil Construct & Environm Engn, San Diego, CA 92182 USA

[2] San Diego State Univ, Sch Publ Hlth, San Diego, CA 92182 USA

关键词: Non-targeted analysis;    Photooxidation;    Fluorescence;    Oil spill;    Gas chromatography;    Pacific Ocean;   

DOI  :  10.1016/j.marpolbul.2021.112049

来源: Elsevier

【 摘 要 】

The persistence and transformation of water soluble chemical constituents derived from surface oil from the 2015 Refugio Oil Spill and from a nearby natural seep were evaluated under simulated sunlight conditions. Photoirradiation resulted in enhanced oil slick dissolution, which was more pronounced in spill oil compared to seep oil. Nontargeted analysis based on GC ? GC/TOF-MS revealed that photoirradiation promoted oil slick dissolution, and more water soluble compounds were released from spill oil (500 compounds) than from seep oil (180 compounds), most of them (488 in spill oil and 150 in seep oil) still persisting in solution after 67 days of photoirradiation. First-order degradation rate coefficients of humic-like water soluble constituents were found to be 0.26 day-1 and 0.29 day-1 for irradiated spill and seep samples, respectively. The decreases in humic-like fluorescence, specific UV absorbance, and aromatic compounds without corresponding decreases in DOC concentration support indirect photochemical transformation in addition to complete photomineralization.

【 授权许可】

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