Chemical Fate of Oils on Indoor Surfaces: Ozonolysis and Peroxidation

Environmental Science & Technology, Год журнала: 2023, Номер 57(41), С. 15546 - 15557

Опубликована: Авг. 30, 2023

Unsaturated triglycerides found in food and skin oils are reactive ambient air. However, the chemical fate of such compounds has not been well characterized genuine indoor environments. Here, we monitored aging oil coatings on glass surfaces over a range environmental conditions, using mass spectrometry, nuclear magnetic resonance (NMR), electron paramagnetic (EPR) techniques. Upon room air exposure (up to 17 ppb ozone), characteristic ozonolysis products, secondary ozonides, were observed near cooking area commercial kitchen, along with condensed-phase aldehydes. In an office setting, is also dominant degradation pathway for films exposed enclosed spaces as drawers, depleted flow makes lipid autoxidation more favorable after induction period few days. Forming hydroperoxides major primary this radical-mediated peroxidation behavior accelerated by direct sunlight, but initiation step dark settings still unclear. These results accord radical measurements, indicating that photooxidation facilitates formation surfaces. Overall, many intermediate end products oxygen species (ROS) may induce oxidative stress human bodies. Given these can be widely both household surfaces, their toxicological properties worth further attention.

Язык: Английский

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Variation of PM_2.5 Redox Potential and Toxicity During Monsoon in Delhi, India

ACS ES&T Air, Год журнала: 2024, Номер 1(4), С. 316 - 329

Опубликована: Фев. 22, 2024

This study investigates daily variations in redox potential of water- and organic-soluble PM2.5 during Delhi's monsoon season, offering insights into its chemical composition, cytotoxicity, oxidative threat to various lung conditions. samples, categorized by pollution levels, showed an average intrinsic (OPmDTT) 27.5 pmol min–1 μg–1, OH• generation 51.1 antioxidant capacity (AOC) both gallic acid trolox equivalency 62.5 35.3 respectively. Water-soluble redox-active compounds (RACs) contributed approximately 67% the potential. The polar-phase distribution RACs can be modified atmospheric photochemistry precipitation. Biomass burning emerged as a pivotal source, with polluted samples exhibiting higher cytotoxicity stress A549 cells. All impaired cellular respiration, reducing oxygen consumption rates Intrinsic OPmDTT were influenced fluid variants, such exogenous nicotine endogenous inflammatory protein. provides comprehensive perspective on toxicity Delhi, India distinct periods also points out importance considering population disparities individual health status assessing impacts.

Язык: Английский

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Simplistic synthesis of ZnO/g-C3N4 heterojunction photocatalyst for improved photodegradation performance

Journal of Materials Science Materials in Electronics, Год журнала: 2024, Номер 35(17)

Опубликована: Июнь 1, 2024

Язык: Английский

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WSe₂–PPy-Based Type-II Heterostructure for Efficient Photocatalytic Removal of Nitrofurazone

Langmuir, Год журнала: 2024, Номер 40(35), С. 18525 - 18534

Опубликована: Авг. 19, 2024

The escalating concerns over water pollution and antimicrobial resistance have underscored the urgency of effective antibiotic degradation. Photocatalytic degradation offers a promising solution due to its efficiency environmental friendliness. In this study, I synthesized novel nanocomposite comprising WSe

Язык: Английский

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Aqueous production of sulfur-containing aerosols from nitroaromatic compounds and SO2 in wintertime urban haze

Science Bulletin, Год журнала: 2025, Номер unknown

Опубликована: Март 1, 2025

Язык: Английский

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Aerosol Toxicokinetics: A Framework for Unraveling Toxicological Dynamics from Air to the Body

Environmental Science & Technology, Год журнала: 2025, Номер unknown

Опубликована: Март 25, 2025

Exposure to atmospheric aerosols threatens human health and is yet be effectively addressed globally. Aerosol toxicity strongly depends upon components whose chemical profiles concentrations can constantly evolve throughout transformation, inhalation, distribution, metabolism, excretion. Despite the abundant studies on aerosol their toxic effects, dynamics in component related biological effects from air body remain unclear. Here, we propose a conceptual toxicokinetic framework mathematically deduce bioavailable concentration changing bulk of constituents atmosphere. The single or multiple are further predicted via toxicodynamic modeling according concentrations. Atmospheric composition turn regulated by risk-based guidelines, aiming alleviate vivo effects. This perspective demonstrates how serial toxicokinetic-toxicodynamic equations bridge knowledge gap between ambient associated bodies. prediction an inhalation also allows connecting with exposomes aggregate exposure pathways. We call for development model validity integrate quantitative adverse outcome pathways apply exposure-disease modeling, providing novel insights into quality policymaking public management.

Язык: Английский

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Deposition of secondary organic aerosol in human lung model: Effect of photochemically aged aerosol on human respiratory system

Ecotoxicology and Environmental Safety, Год журнала: 2023, Номер 265, С. 115497 - 115497

Опубликована: Сен. 18, 2023

Ultrafine particles (UFP) of Secondary Organic Aerosol (SOA) penetrate deep into the human respiratory system and exert fatal effects on health. However, there is little data potential deposited doses UFP-generated SOA in tract. This study to estimate fraction aerosol deposition using a multiple-path-particle-dosimetry (MPPD) model. For relevancy real life, model employed measured concentrations toluene-derived fresh aged produced within serially connected smog chamber PAM-OFR (Potential Mass-Oxidation Flow Reactor) under atmospheric environmental conditions (NOx relative humidity). The number chemical composition aerosols chambers were Scanning Mobility Particle Sizer (SMPS) High-Resolution Time-of-Flight Mass Spectrometer (HR-ToF-AMS), while morphology individual was analyzed Electron Microscopy (SEM). concentration SOA-w/s more than double compared that (maximum reached after 10 h) with its size less 100 nm. O:C ratio for 0.96 1.15 depending RH (0.96 at 3% 50% RH), spherical containing water present agglomerates 1 µm. In all inhalable two chambers, 5-22% Head airways, 4-8% tracheobronchial, 8-34% alveolar regions. predominant occurred alveoli (in generation 20th lobe), faction 2-3 times higher children group adults group. presented quantitative exposure assessment generated realistic simulation suggested possibility evaluating long-term health by determining system.

Язык: Английский

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Atmospheric aging modifies the redox potential and toxicity of humic-like substances (HULIS) from biomass burning

Environmental Science Atmospheres, Год журнала: 2023, Номер 3(12), С. 1791 - 1804

Опубликована: Янв. 1, 2023

Atmospheric aging through diverse reaction pathways modifies redox potential and composition of organic aerosols, leading to varied dynamic behaviors aerosols in the respiratory system endpoint toxic results.

Язык: Английский

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Modelling molecular composition of SOA from toluene photo-oxidation at urban and street scales

Environmental Science Atmospheres, Год журнала: 2024, Номер 4(8), С. 839 - 847

Опубликована: Янв. 1, 2024

Near-explicit chemical mechanisms representing toluene SOA formation are reduced using the GENOA algorithm and used in 3D simulations of air quality over Greater Paris streets a district near Paris.

Язык: Английский

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Review of health effects driven by aerosol acidity: Occurrence and implications for air pollution control

The Science of The Total Environment, Год журнала: 2024, Номер 955, С. 176839 - 176839

Опубликована: Окт. 16, 2024

Язык: Английский

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