2023
DOI: 10.26434/chemrxiv-2023-0mnh8-v2
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Reactive oxygen species and chromophoric dissolved organic matter drive the aquatic photochemical pathways and photoproducts of 6PPD-Quinone under simulated high-latitude conditions

Zachary Redman,
Jessica Begley,
Isabel Hillestad
et al.

Abstract: The photochemical degradation pathways of 6PPD-quinone (6PPDQ, 6PPD-Q), a toxic transformation product of the tire antiozonant 6PPD, were determined under simulated sunlight conditions typical of high-latitude surface waters. Direct photochemical degradation resulted in 6PPDQ half-lives ranging from 17.5 h at 20 °C to no observable degradation over 48 h at 4 °C. Sensitization of excited triplet state pathways using Cs+ and Ar purging demonstrated that 6PPDQ does not decompose significantly from a triplet state… Show more

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“…Dealkylation reactions were also observed in a study on 6PPD-quinone photodegradation induced by •OH and 1 O 2 . 58 Among the reactions occurring in DOM Re , only the quantity of the decarboxylation reaction (loss of CO 2 ) was notably greater than that in DOM Ri . This may be due to the presence of more saturated (H/C > 1.0) molecules in DOM Re than in DOM Ri (Figure 1D), as the saturated molecules were prone to undergo a decarboxylation reaction due to the •OH attack.…”
Section: Differences In Composition Andmentioning
confidence: 96%
“…Dealkylation reactions were also observed in a study on 6PPD-quinone photodegradation induced by •OH and 1 O 2 . 58 Among the reactions occurring in DOM Re , only the quantity of the decarboxylation reaction (loss of CO 2 ) was notably greater than that in DOM Ri . This may be due to the presence of more saturated (H/C > 1.0) molecules in DOM Re than in DOM Ri (Figure 1D), as the saturated molecules were prone to undergo a decarboxylation reaction due to the •OH attack.…”
Section: Differences In Composition Andmentioning
confidence: 96%