Polycyclic aromatic hydrocarbons are widespread and environmentally persistent chemicals that readily bind to particles in air, soil and sediment. Plastic particles, which are also a ubiquitous global contamination problem, may thus modulate their environmental fate and ecotoxicity. First, the acute aqueous toxicity of phenanthrene in adult Gammarus roeseli was determined with a LC₅₀ of 471 μg/L after 24 h and 441 μg/L after 48 h. Second, considering lethal and sublethal endpoints, effects of phenanthrene concentration on G. roeseli were assessed in relation to the presence of anthropogenic and natural particles. The exposure of gammarids in presence of either particle type with phenanthrene resulted after 24 and 48 h in reduced effect size. Particle exposure alone did not result in any effects. The observed reduction of phenanthrene toxicity by polyamide contradicts the discussion of microplastics acting as a vector or synergistically. Especially, no difference in modulation by plastic particles and naturally occurring sediment particles was measured. These findings can most likely be explained by the similar adsorption of phenanthrene to both particle types resulting in reduced bioavailability.

多环芳烃是广泛存在且对环境持久的化学物质，易于与空气，土壤和沉积物中的颗粒结合。塑料颗粒也是普遍存在的全球污染问题，因此可能会调节其环境命运和生态毒性。首先，用24小时后471μg/ L的LC ₅₀和48小时后441μg / L的LC ₅₀确定菲对成年Gammarus roeseli中菲的急性水毒性。其次，考虑致死性和亚致死性终点，菲浓度对罗氏乳杆菌的影响对人为和天然颗粒的存在进行了评估。在24小时和48小时后，在两种颗粒类型中都存在的菲与菲一起暴露于gammarids中，从而降低了效应大小。单独的颗粒暴露不会产生任何影响。观察到的聚酰胺对菲毒性的降低与微塑料作为载体或协同作用的讨论相矛盾。尤其是，没有测量到塑料颗粒和天然沉淀颗粒的调制差异。这些发现很可能可以通过菲对两种颗粒的相似吸附而导致生物利用度降低。