Antiozonants are added to car tires during vulcanization, in order to prevent and slow down the degradation of rubber caused by ozone, which enables the protection and safety of drivers and passengers while driving a car. 6PPD is a standard antiozonant in car tires, but when it reacts with ozone, its transformation by-product N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine-quinone (6PPD-Q) is formed. 6PPD quinone is washed off of car tires and roads during each hydrologic cycle, leading to its migration into natural waters. When found in aquatic environment, 6PPD-Q shows a toxic effect on various fish, cryfish and microalgae, in addition it's deadly for certain types of salmon. Microplastics are found in everyday products, and due to inadequate disposal of their waste after use, they migrate into the environment where they also pollute natural waters. Certain aquatic organisms, such as fish and crayfish, indiscriminately consume it, which causes short-term and long-term consequences for their organisms. Since microplastics has a high value of adsorption capacity, organic pollutants from the environment can be adsorbed on the surface of its particles. Adsorption is accumulation of particles from a neighbouring (gas or liquid) phase on to the surface of the solid phase, which is caused by intermolecular forces of the particles on the solid surface and particles from the adjacant phase. Adsorption of 6PPD quinone in aqueous solution on microplastics PP 0 (unaged polypropylene) and PP UV 56 (UV aged polypropylene) was tested. The samples were recorded with high performance liquid chromatography (HPLC), which enabled the determination of the concentration of 6PPD quinone in the aqueous solution before and after adsorption. The toxicity of blank solutions of 6PPD quinone and microplastics and their mixtures 24 h after adsorption on the freshwater flea Daphnia Magna was also tested. The results showed that the adsorption of 6PPD quinone on microplastics in both cases follows the Langmuir model, takes place in a monolayer, and the distribution of active sites on the adsorbent is homogeneous. Aged microplastic (PP UV 56) has a higher adsorption equilibrium constant and thus a higher affinity for 6PPD quinone adsorption than unaged microplastic (PP 0). Also, it was shown that only a quarter of a sample of blank 6PPD quinone solution is needed to achieve 50% inhibition of water flea Daphnia Magna. Although a slightly larger fraction of the sample of the aqueous solution of 6PPD quinone with PP 0 and PP UV 56 24 h after adsorption is required compared to the blank solution, they still show a toxic effect on water fleas.