水体塑料微粒污染是全球关注的重大环境和健康问题。当前研究多关注塑料微粒的环境赋存及生物效应，其环境迁移过程及其作为载体对共存污染物环境行为的影响研究却相对较少。本研究以解析城市河流中塑料微粒的垂向迁移过程及其对共存双酚类塑化剂（BPs）迁移转化及生物有效性的影响机制为目标，结合野外采样分析和室内模拟实验，首先研究城市河流中塑料微粒的垂向分布和聚沉行为，阐明其垂向迁移规律及环境响应机制；在此基础上，研究塑料微粒垂向迁移对共存BPs多介质迁移及微生物降解过程的影响，结合微界面过程和微生物学响应分析，阐明其对BPs环境归趋的影响机制；最后利用分层主动生物监测技术，研究分层暴露的水生生物对塑料微粒与BPs的富集行为和生物响应，阐明塑料微粒垂向迁移对BPs生物有效性的分层影响，揭示两者在生物体内的交互作用机理，为城市河流复合污染的风险管控与精准治理提供科学依据。

Microplastics pollution in aquatic environments is a significant environmental and health issue of global dimensions. However, previous studies mainly focused on the occurrences and biological effects of microplastics in aquatic environments, and ignored their transportation and the induced impact on the environmental behaviors of the coexisting pollutants through their carrier effects. Therefore, this study is to illuminate the vertical transportation of microplastics and their impact on the transportation, transformation and bioavailability of the coexisting bisphenols (BPs) in urban river by combining the wild sampling and indoor cultivation. The vertical distribution and coagulation pattern of microplastics in different urban rivers should be studied first to uncover the vertical transportation of microplastics and their environmental responses. Then, variations in the transportation of the coexisting BPs in multi-interphase systems and their microbial transformation caused by microplastics will be determined to clarify their impact on the environmental fates of BPs in aquatic environments through analyzing the micro-interracial processes between microplastics and BPs and the related microbiological responses. Finally, the accumulation and biological responses of microplastics and BPs in aquatic organisms in different layers will be investigated based on the layered active biological monitoring to reveal the influence of microplastics on the bioavailability of BPs and the underlying interactive mechanism in aquatic organisms. The above results could provide precise information for the risk management and control of the combined pollution in urban river.