Key Laboratory of Integrated Regulation and Resources Development of Shallow Lakes of Ministry of Education, Hohai University, Nanjing 210098, China; College of Environment, Hohai University, Nanjing 210098, China.
Key Laboratory of Integrated Regulation and Resources Development of Shallow Lakes of Ministry of Education, Hohai University, Nanjing 210098, China; College of Environment, Hohai University, Nanjing 210098, China.
J Hazard Mater. 2024 Oct 5;478:135610. doi: 10.1016/j.jhazmat.2024.135610. Epub 2024 Aug 22.
Microplastics (MPs) have unique toxicokinetic (TK) processes that differ from those of soluble pollutants. This study investigated the ingestion, migration, accumulation, and clearance of environmental aging MPs in the Japanese swamp shrimp (Macrobrachium nipponense). The concentrations of plastic additives and personal care products adsorbed onto MPs in natural river water were determined, and TK models for MPs and MPs-loaded pollutants were developed. Results showed that the formation of surface biofilms and alterations in the distribution of MPs in waters caused by environmental aging affect MPs bioavailability, which is mainly related to the feeding habits of shrimp. The decrease in MPs particle size caused by biological digestion and the increase in the number of oxygen-containing functional groups caused by environmental aging affect the TK process of MPs. The TK model of MPs-loaded pollutants revealed the cleaning effect of shrimp on pollutants adsorbed onto MPs during swallowing and spitting MPs. This cleaning effect significantly increases the bioavailability of MPs-associated pollutants in aquatic environments. This study provides a new perspective for understanding the interactions between environmental MPs and their associated pollutants in aquatic ecosystems.
微塑料（MPs）具有独特的毒代动力学（TK）过程，与可溶性污染物不同。本研究调查了环境老化 MPs 在日本沼虾（Macrobrachium nipponense）中的摄入、迁移、积累和清除。测定了天然河水中 MPs 吸附的塑料添加剂和个人护理产品的浓度，并开发了 MPs 和负载污染物的 TK 模型。结果表明，环境老化引起的表面生物膜形成和 MPs 在水中分布的改变会影响 MPs 的生物利用度，这主要与虾的摄食习性有关。生物消化导致 MPs 粒径减小，环境老化导致含氧官能团数量增加，这都会影响 MPs 的 TK 过程。负载污染物的 MPs 的 TK 模型揭示了虾在吞咽和吐出 MPs 时对吸附在 MPs 上的污染物的清除作用。这种清除作用显著增加了 MPs 相关污染物在水生环境中的生物利用度。本研究为理解水生生态系统中环境 MPs 与其相关污染物之间的相互作用提供了新的视角。
