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• W4210464638 abstract "Given the adverse environmental impacts of the antifoulants currently used in marine antifouling paints, such as copper and booster biocides, it is urgent to identify potential substitutes that are environmentally benign. Here, we examined the degradation of camptothecin (a natural product previously identified as an efficient antifoulant in the laboratory and in the field) under various conditions and evaluated the environmental risks associated with its use as a marine antifoulant. We found that camptothecin was rapidly photolyzed in seawater: the half-life of camptothecin was less than 1 d under a light intensity of 1000-20,000 lx and was approximately 0.17 d under sunlight irradiation. At pH 4 and pH 7, camptothecin had half-lives of 30.13 and 16.90 d, respectively; at 4 °C, 25 °C, and 35 °C, the half-lives of camptothecin were 23.90, 21.66, and 26.65 d, respectively. Camptothecin biodegradation in seawater was negligible. The predicted no-effect concentration (PNEC) of camptothecin was 2.19 × 10-1 μg L-1, while the average predicted environmental concentrations (PECs) in open seas, shipping lanes, commercial harbors, and marinas were 6.14 × 10-7, 9.39 × 10-7, 6.80 × 10-3, and 5.03 × 10-2 μg L-1, respectively. The PEC/PNEC ratio of camptothecin was much lower than 1 (i.e., 2.80 × 10-6, 4.29 × 10-6, 3.11 × 10-2, and 2.30 × 10-1 for open seas, shipping lanes, commercial harbors, and marinas, respectively), indicating that the use of camptothecin as a marine antifoulant posed little environmental risk." @default.
• W4210464638 created "2022-02-08" @default.
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• W4210464638 date "2022-05-01" @default.
• W4210464638 modified "2023-10-16" @default.
• W4210464638 title "The degradation and environmental risk of camptothecin, a promising marine antifoulant" @default.
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• W4210464638 doi "https://doi.org/10.1016/j.scitotenv.2022.153384" @default.
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