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Zhao, Haoqi Nina ; Hu, Ximin ; Tian, Zhenyu , et al. Environ. Sci. Technol.,2023,57(14):5621-5632. DOI: 10.1021/acs.est.2c08690 PubMed ID: 36996351
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Abstract: 6PPD, a tire rubber antioxidant, poses substantial ecol. risks because it can form a highly toxic quinone transformation product (TP), 6PPD-quinone (6PPDQ), during exposure to gas-phase ozone. Important data gaps exist regarding the structures, reaction mechanisms, and environmental occurrence of TPs from 6PPD ozonation. To address these data gaps, gas-phase ozonation of 6PPD was conducted over 24-168 h and ozonation TPs were characterized using high-resolution mass spectrometry. The probable structures were proposed for 23 TPs with 5 subsequently standard-verified. Consistent with prior findings, 6PPDQ (C18H22N2O2) was one of the major TPs in 6PPD ozonation (~1 to 19% yield). Notably, 6PPDQ was not observed during ozonation of 6QDI (N-(1,3-dimethylbutyl)-N'-phenyl-p-quinonediimine), indicating that 6PPDQ formation does not proceed through 6QDI or associated 6QDI TPs. Other major 6PPD TPs included multiple C18H22N2O and C18H22N2O2 isomers, with presumptive N-oxide, N,N'-dioxide, and orthoquinone structures. Standard-verified TPs were quantified in roadway-impacted environmental samples, with total concentrations of 130 ± 3.2μg/g in methanol extracts of tire tread wear particles (TWPs), 34 ± 4μg/g-TWP in aqueous TWP leachates, 2700 ± 1500 ng/L in roadway runoff, and 1900 ± 1200 ng/L in roadway-impacted creeks. These data demonstrate that 6PPD TPs are likely an important and ubiquitous class of contaminants in roadway-impacted environments.
Keywords: 6PPD ; 6QDI ; ozone ; air ; N-oxide ; tire tread wear particles ; roadway environments
Purchased from AmBeed: 793-24-8
CAS No. : | 793-24-8 | MDL No. : | MFCD00072248 |
Formula : | C18H24N2 | Boiling Point : | - |
Linear Structure Formula : | - | InChI Key : | ZZMVLMVFYMGSMY-UHFFFAOYSA-N |
M.W : | 268.40 | Pubchem ID : | 13101 |
Synonyms : |
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Signal Word: | Danger | Class: | 9 |
Precautionary Statements: | P501-P273-P260-P270-P264-P280-P391-P314-P337+P313-P305+P351+P338-P301+P312+P330 | UN#: | 3077 |
Hazard Statements: | H302-H319-H372-H410 | Packing Group: | Ⅲ |
GHS Pictogram: |
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