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| Main Authors: | , , , , , , , , , , |
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| Format: | Artículo científico |
| Language: | en |
| Published: |
Marine pollution bulletin
2025
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| Subjects: | |
| Online Access: | https://pubmed.ncbi.nlm.nih.gov/40829416/ |
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Table of Contents:
- Release kinetics and bioaccessibility of heavy metal from antifouling paint particles in simulated digestive fluids: An emerging threat to marine biota. Li, Zhen-Liang Xu, Ting-Ting Yao, Shan-Shan Li, Heng-Xiang Liu, Shan Hou, Rui Lin, Lang Ni, Zhi-Xin Xie, Qun Huang, Xiao-Ping Xu, Xiang-Rong Metals, Heavy Water Pollutants, Chemical Animals Paint Kinetics Polychaeta Aquatic Organisms Fishes Biofouling Biota Antifouling paints can effectively prevent marine organisms from biofouling. However, the release of antifouling paint particles (APPs) and their toxic additives has emerged as a significant source of marine contamination, posing potential threats to marine biota. Hence, this study investigated the release kinetics and bioaccessibility of heavy metals from APPs in simulated digestive fluids, mimicking the gastrointestinal conditions of marine polychaete, fish, and seabird. The release behavior was analyzed with first-order kinetic model, second-order kinetic model, and diffusion-controlled model. Results showed that copper (Cu), zinc (Zn), and lead (Pb) were the predominant heavy metals released from APPs. Their release dynamics optimally fitted to diffusion-controlled model, indicating that intra-particle diffusion was a critical rate-determining step. After 144 h of exposure, the leaching concentrations of Cu, Zn, and Pb reached 5.67 mg·L, 2.25 mg·L, and 0.0031 mg·L in polychaete digestive fluid, and 12.94 mg·L, 99.71 mg·L, and 0.041 mg·L in fish digestive fluid and 65.08 mg·L, 40.06 mg·L, and 0.013 mg·L in seabird digestive fluid, respectively. UV-accelerated aging can chang the carbonyl index and O/C ratio of APPs, further significantly enhance the release of heavy metals and their bioaccessibility in simulated digestive fluids. Fish digestive fluids exhibited higher leaching and bioaccessibility of heavy metal than polychaete and seabird digestive fluids. This study reveals the increased bioaccessibility of heavy metals from APPs in simulated digestive fluids and highlights the need for further research on their environmental behaviors and toxicological impacts on marine biota.