Release behavior of Zn(II)-containing additives in expanded polystyrene microplastics
XIE Qun1, YUAN Min-qing2, HU Xuan-yu3, WANG Zi-yi4, LIN Lang5, LI Zhen-liang5, XU Xiang-rong5, ZHU Guang-hui2, WU Min-hua6
1. Analytical and Testing Center, Guangdong Ocean University, Zhanjiang 524088, China; 2. College of Chemistry and Environmental Science, Guangdong Ocean University, Zhanjiang 524088, China; 3. College of Oceanography and Meteorology, Guangdong Ocean University, Zhanjiang 524088, China; 4. College of Food Science and Technology, Guangdong Ocean University, Zhanjiang 524088, China; 5. Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Science, Guangzhou 510301, China; 6. School of Basic Medicine, Guangdong Medical University, Zhanjiang 524023, China
Abstract：In order to explore the release rules and influencing factors of heavy metal-containing additives in microplastics to the environment, the release behaviors of Zn (II)-containing additives from fresh and ultraviolet (UV)-aged expanded polystyrene (EPS) microplastics were studied. The release kinetics, cumulative release and orthogonal experiments were carried out under three simulated environments, including freshwater, seawater and gastric fluids. The results showed that the release capacity of Zn(II) from UV-aged EPS microplastics was greater than that from fresh EPS microplastics. The equilibrium release amount of Zn(II) from UV-aged EPS microplastics were (29.45±4.38), (87.41±5.18) and (109.94±3.18)μg/g in freshwater, seawater and gastric fluids, respectively, while the equilibrium release amount of Zn(II) from fresh EPS microplastics were (20.90±0.46), (85.89±0.51) and (108.92±1.17)μg/g, respectively, suggesting that UV aging could promote the release of Zn(II) from the additives. The gastric fluids and seawater environment were more favorable for the release of Zn(II). The release of Zn(II) from EPS microplastics is fitted to a pseudo-second-order kinetic model, indicating that the release of Zn(II) from the plastics is controlled by the interfacial reaction and the diffusion on the plastic surface. The Zn(II) in the EPS microplastics can be almost completely released by repeatedly replacing the extract. The pH value, particle size and aging time are the main factors affecting the release of Zn(II) from EPS microplastic.
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