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Chemical Leaching from Tire Wear Particles with Various Treadwear Ratings
Yoonah Jeong1, Seokhwan Lee2, Sang-Hee Woo2
1Department of Environmental Research, Korea Institute of Civil Engineering and Building Technology (KICT), Goyang-daero 283, Goyang-si 10223, Korea.
Abstract:
Physical friction between a tire and the road surface generates tire wear particles (TWPs), which are a source of microplastics and particulate matter. This study investigated the trends of chemical leaching from TWPs depending on the treadwear rating of the tire. A road simulator was used to produce TWPs from tires with various treadwear ratings. Liquid chromatography-tandem mass spectrometry was used to analyze the chemical leaching from TWPs, with a particular focus on benzothiazole and its derivative 2-hydroxy benzothiazole. However, chemical mapping via high-resolution tandem mass spectrometry detected another derivative: 2-mercaptobenzothiazole. The benzothiazole groups were observed to have different leaching tendencies, implying that using benzothiazole as a marker compound may lead to incorrect TWP quantitation. The results of this research also suggest that the ecotoxicological influence of TWPs can vary with the treadwear rating of a tire.
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