Uptake and release of organic pollutants in suspended particles (microplastics)

许多人为污染物是通过颗粒物输送到环境中的。对于有机化合物，有机或碳质颗粒(烟尘、煤、焦炭、有机胶体等)是最相关的运输媒介。最近，微塑料颗粒在污水接收河流中的广泛存在变得明显，可以合理地假设这些颗粒在废水中装载了有机化合物(如被动取样器)，并具有很高的向淡水生态系统转移污染物的潜力。本研究旨在阐明废水中有机物在不同类型的微塑料颗粒(聚乙烯、介孔聚苯乙烯、聚酰胺纤维)上的积累和传质机理。令人关注的化合物包括有机磷阻燃剂(TCPP)、烷基酚、消毒剂(三氯生)和转化产物(甲基三氯生)以及多环芳烃。由于微塑料颗粒在形状和组成方面具有很好的特性，所提出的吸附/解吸研究也有助于了解污染物在河流悬浮沉积物上的吸收和释放动力学。

Many anthropogenic pollutants are transported into the environment by particles. For organic compounds organic or carbonaceous particles (soot, coals, chars, organic colloids, etc.) are the most relevant transport vectors. Recently, the wide spread occurrence of microplastic particles in waste water receiving rivers became obvious and it is reasonable to assume that these particles get loaded with organic compounds in waste water (like passive samplers) and have a high potential to transfer pollutants into freshwater ecosystems. This proposal aims at elucidation of accumulation and mass transfer mechanisms of waste water borne organic compounds on different microplastic particle types (polyethylene, mesoporous polystyrene, polyamid fibers). Compounds of concern include organophosphate flame retardants (TCPP), alkylphenols, disinfectants (triclosan) and transformation products (methyltriclosan) as well as polycyclic aromatic hydrocarbons. Since microplastic particles are well characterized in terms of shape and composition the proposed sorption/desorption studies can also help to understand uptake and release kinetics of pollutants on suspended sediments in rivers.