Publication Details |
| Category | Text Publication |
| Reference Category | Journals |
| DOI | 10.1016/j.envpol.2026.127682 |
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| Title (Primary) | Simulated atmospheric transformation of the tire additives in the aqueous phase: 6-PPD, 6-PPD quinone, diphenylguanidine, and dicyclohexylamine |
| Author | Kuntz, V.; Kamprad, N.; Seiwert, B.; Schaefer, T.; Herrmann, H.; Reemtsma, T.; Zahn, D.
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| Source Titel | Environmental Pollution |
| Year | 2026 |
| Department | EAC |
| Volume | 393 |
| Page From | art. 127682 |
| Language | englisch |
| Topic | T9 Healthy Planet |
| Supplements | Supplement 1 |
| Keywords | Microplastics Atmospheric chemistry Antioxidant Oxidation product Vulcanization accelerators Particulate matter |
| Abstract | Tire
and road wear particles (TRWP) are emitted in large amounts into the
environment; a fraction of them becomes part of atmospheric aerosol. The
degradation of four tire-derived chemicals,
N-(1,3-dimethylbutyl)-N′-phenyl-p-phenylenediamine (6-PPD), its
transformation product 6-PPD quinone (6-PPDQ), diphenylguanidine (DPG),
and dicyclohexylamine (DCHA) was studied under simulated atmospheric
conditions in the aqueous phase (direct photolysis, reactions with
hydroxyl-radicals and sulfate-radical anions). A high reactivity of the
four chemicals towards radicals was observed and 141 transformation
products (TPs) were detected by liquid chromatography-high
resolution-mass spectrometry, of which more than the half were newly
reported. Key intermediates of DPG and DCHA were detected by
suspect-screening in urban and rural aerosol, thus demonstrating their
environmental relevance. TPs of 6-PPD and 6-PPDQ were not found, likely
due to the 100 times lower concentration of these compounds in the
aerosol compared to DPG and DCHA. As long as the chemicals are embedded
into the tire-matrix, their reactivity is expected to be lower. Future
monitoring studies in aerosol should consider both the tire-derived
chemicals and the TPs of their reaction with hydroxyl-radicals and
sulfate-radical anions during atmospheric transport. TPs of tire-derived
chemicals may be of relevance for human exposure and considered in
future risk assessment. |
| Kuntz, V., Kamprad, N., Seiwert, B., Schaefer, T., Herrmann, H., Reemtsma, T., Zahn, D. (2026): Simulated atmospheric transformation of the tire additives in the aqueous phase: 6-PPD, 6-PPD quinone, diphenylguanidine, and dicyclohexylamine Environ. Pollut. 393 , art. 127682 10.1016/j.envpol.2026.127682 |
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