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Simulated Leaching and Photodegradation of Tire Tread Particle-Derived Compounds in Natural Water.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Simulated Leaching and Photodegradation of Tire Tread Particle-Derived Compounds in Natural Water./
Author:	Hollman, Kelly Vitancol.
Description:	1 online resource (105 pages)
Notes:	Source: Masters Abstracts International, Volume: 84-10.
Contained By:	Masters Abstracts International84-10.
Subject:	Civil engineering. -
Online resource:	click for full text (PQDT)
ISBN:	9798379426606

Simulated Leaching and Photodegradation of Tire Tread Particle-Derived Compounds in Natural Water.
Hollman, Kelly Vitancol.

Simulated Leaching and Photodegradation of Tire Tread Particle-Derived Compounds in Natural Water. - 1 online resource (105 pages)

Source: Masters Abstracts International, Volume: 84-10.

Thesis (M.S.)--San Diego State University, 2023.

Includes bibliographical references

Tire wear particles (TWP) are microplastics (< 5 mm) released from tire abrasion against road surfaces. TWP accumulate on roads in dry weather and are transported into surface water via atmospheric deposition and stormwater runoff. Like other microplastics, TWP are persistent in the environment and may transport various contaminants. Previous research has shown that tires contain known toxic chemicals, such as 6PPD (antiozonant), plasticizers, and polycyclic aromatic hydrocarbons (PAHs). There is a need to better understand the behavior of TWP in water under realistic environmental conditions, including sunlight exposure. To investigate the leaching of chemicals, cryomilled tire tread particles (TTP) were suspended in laboratory-created freshwater under photoirradiated (simulated sunlight) or dark (nonirradiated) conditions. Dissolved organic carbon (DOC) and total dissolved nitrogen (TDN) concentrations were measured to quantify dissolved constituents or leachates. DOC and TDN range from 0.47 to 1.04 mg DOC/g TTP and 0.09 to 0.38 mg TDN/g TTP, and concentrations increased with longer leaching time and decreased when samples were photoirradiated compared to dark controls. Leachates were also photoirradiated to isolate the effects of sunlight, which resulted in losses of 1.06 to 1.48 mg/L DOC and 0.29 to 0.38 mg/L TDN due to photodegradation.Leaching and photochemical degradation rates were estimated by measuring fluorescence intensities over time. Some fluorescent compounds leached from TTP were resistant to photodegradation, resulting in a zero-order decay rate of 0.04 ± 0.0007 Raman Units (RU) h-1 and first-order decay rates of 0.015 ± 0.00047 h-1 and 0.017 ± 0.0012 h-1 . Others were photo-labile and experienced double exponential decay, resulting in photo-labile decay rates of 1.78 h-1 and 1.17 ± 0.057 h-1 and photo-semilabile decay rates of 0.010 h-1 and 0.0033 ± 0.0024 h-1 . Parallel factor analysis (PARAFAC) was also completed to identify fluorophores that were not visible from peak picking. Additionally, fluorescent spectral signatures of TTP-specific compounds were obtained to evaluate whether some compounds could be traced directly with fluorescence. Overall, evaluating spectral signatures of persistent and removed compounds and the kinetics of sunlight-driven leaching and degradation aim to inform policies regulating chemicals and materials used in tire manufacturing.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9798379426606Subjects--Topical Terms:

561339
Civil engineering.
Subjects--Index Terms:

PhotodegradationIndex Terms--Genre/Form:

554714
Electronic books.

Simulated Leaching and Photodegradation of Tire Tread Particle-Derived Compounds in Natural Water.
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520 $a Tire wear particles (TWP) are microplastics (< 5 mm) released from tire abrasion against road surfaces. TWP accumulate on roads in dry weather and are transported into surface water via atmospheric deposition and stormwater runoff. Like other microplastics, TWP are persistent in the environment and may transport various contaminants. Previous research has shown that tires contain known toxic chemicals, such as 6PPD (antiozonant), plasticizers, and polycyclic aromatic hydrocarbons (PAHs). There is a need to better understand the behavior of TWP in water under realistic environmental conditions, including sunlight exposure. To investigate the leaching of chemicals, cryomilled tire tread particles (TTP) were suspended in laboratory-created freshwater under photoirradiated (simulated sunlight) or dark (nonirradiated) conditions. Dissolved organic carbon (DOC) and total dissolved nitrogen (TDN) concentrations were measured to quantify dissolved constituents or leachates. DOC and TDN range from 0.47 to 1.04 mg DOC/g TTP and 0.09 to 0.38 mg TDN/g TTP, and concentrations increased with longer leaching time and decreased when samples were photoirradiated compared to dark controls. Leachates were also photoirradiated to isolate the effects of sunlight, which resulted in losses of 1.06 to 1.48 mg/L DOC and 0.29 to 0.38 mg/L TDN due to photodegradation.Leaching and photochemical degradation rates were estimated by measuring fluorescence intensities over time. Some fluorescent compounds leached from TTP were resistant to photodegradation, resulting in a zero-order decay rate of 0.04 ± 0.0007 Raman Units (RU) h-1 and first-order decay rates of 0.015 ± 0.00047 h-1 and 0.017 ± 0.0012 h-1 . Others were photo-labile and experienced double exponential decay, resulting in photo-labile decay rates of 1.78 h-1 and 1.17 ± 0.057 h-1 and photo-semilabile decay rates of 0.010 h-1 and 0.0033 ± 0.0024 h-1 . Parallel factor analysis (PARAFAC) was also completed to identify fluorophores that were not visible from peak picking. Additionally, fluorescent spectral signatures of TTP-specific compounds were obtained to evaluate whether some compounds could be traced directly with fluorescence. Overall, evaluating spectral signatures of persistent and removed compounds and the kinetics of sunlight-driven leaching and degradation aim to inform policies regulating chemicals and materials used in tire manufacturing.
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653 $a Photodegradation
653 $a Microplastics
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653 $a Fluorescence intensities
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