Biogenic and Anthropogenic Secondary Organic Aerosols Become Fluorescent after Highly Acidic Aging DOI Creative Commons
Cynthia Wong,

Jett Vuong,

Sergey A. Nizkorodov

et al.

The Journal of Physical Chemistry A, Journal Year: 2024, Volume and Issue: 128(36), P. 7657 - 7668

Published: Aug. 30, 2024

Primary biological aerosol particles (PBAPs) and secondary organic (SOA) both contain compounds that share similar chemical optical properties. Fluorescence is often used to characterize PBAPs; however, this may be hindered due interferences from fluorophores in SOA. Despite extensive efforts understand the aging of SOA under elevated particle acidity conditions, little known about how these processes affect fluorescence thereby their interference with measurements PBAPs. The objective study investigate influence on properties aerosols potential for analysis bioaerosols. was generated by O3- or OH-initiated oxidation d-limonene α-pinene, as well toluene xylene. were then aged exposure varying concentrations aqueous H2SO4 2 days. Absorption spectrophotometry examine changes before after aging. key observation appearance strongly light-absorbing fluorescent at pH = ∼−1, suggesting a major driver biogenic precursors (d-limonene α-pinene) resulted stronger than absorption spectra changed drastically shape upon dilution, whereas shapes remained same, chromophores are separate sets species. overlapped PBAPs, exposed highly acidic conditions can confused PBAPs detected fluorescence-based methods. These likely play role atmospheric regions where high persist, such upper troposphere lower stratosphere.

Language: Английский

pH dependence of brown-carbon optical properties in cloud water DOI Creative Commons
Christopher J. Hennigan, Michael L. McKee, Vikram Pratap

et al.

Atmospheric chemistry and physics, Journal Year: 2023, Volume and Issue: 23(22), P. 14437 - 14449

Published: Nov. 22, 2023

Abstract. Light-absorbing organic species present in aerosols, collectively called brown carbon (BrC), have important but highly uncertain effects on climate. Clouds likely represent a significant medium for secondary BrC production and bleaching reactions, though the relative importance of formation loss processes clouds is unknown at present. The acidity (or pH) atmospheric particles affects optical properties rates. Given wide variability pH atmosphere (pH ranges from −1 to 8), its behavior are expected vary significantly, link between yet another uncertainty attempts constrain climate forcing effects. In this work, we characterize dependence – including light absorption 365 nm (Abs365), mass coefficient (MAC365), Ångström exponent (AAE) bulk cloud water sampled summit Whiteface Mountain, NY. all samples (n=17), Abs365 MAC365 increased linearly with increasing pH, highlighting reporting studies aqueous media. There was strong sensitivity normalized slopes that ranged 5.1 % 17.2 per unit. slope decreased strongly [K+], suggesting non-biomass-burning has more sensitive than associated biomass burning. AAE also showed distinct as it relatively flat 1.5–5 then significantly above 5. composition used inform thermodynamic predictions aerosol upwind and/or downwind Mountain subsequent changes properties. Overall, these results show that, addition production, photobleaching, altitudinal distribution, quite affected by pH-dependent absorption.

Language: Английский

Citations

4
Measurement report: Effects of transition metal ions on the optical properties of humic-like substances (HULIS) reveal a structural preference – a case study of PM2.5 in Beijing, China DOI Creative Commons
Juanjuan Qin, Leiming Zhang, Yuanyuan Qin

et al.

Atmospheric chemistry and physics, Journal Year: 2024, Volume and Issue: 24(13), P. 7575 - 7589

Published: July 4, 2024

Abstract. Humic-like substances (HULIS) are complex macromolecules in water-soluble organic compounds (WSOCs) containing multiple functional groups, and transition metal ions (TMs) ubiquitous atmospheric particles. In this study, potential physical chemical interactions between HULIS four TM species, including Cu2+, Mn2+, Ni2+, Zn2+, were analyzed by optical method under acidic, weakly neutral conditions. The results showed that Zn2+ only slightly enhanced mass absorption efficiency (MAE365) of winter had indiscernible effects on the Ångström exponent (AAE) both seasons all acidity All TMs fluorescence quenching HULIS, Cu2+ similar summer with highest coefficients found acidic conditions seasons. 1H-nuclear magnetic resonance (1H-NMR) Fourier-transform infrared (FTIR) spectra revealed mainly bound aromatic species tightened molecule structures HULIS. parallel factor analysis (PARAFAC) extracted components low-oxidized humic-like (C1), N-containing (C2), highly oxidized (C3), mixing residuals (C4), from summer. spectral characteristic additions three indicated electron-donating groups corresponded to C1 C3, binding replacing protons, while electron-withdrawing could correspond C2, its connection through electrostatic adsorption or colliding-induced energy transfer.

Language: Английский

Citations

1
Photochemical activity of water-soluble organic compounds in motor vehicle exhaust particulate matter DOI

Yixi Huang,

Die Zhou,

Jie Pu

et al.

Chemosphere, Journal Year: 2024, Volume and Issue: 364, P. 143270 - 143270

Published: Sept. 1, 2024

Language: Английский

Citations

1
Measurement Report: Effects of transition metal ions on the optical properties of humic-like substances revealing structural preference DOI Creative Commons
Juanjuan Qin, Leiming Zhang, Yuanyuan Qin

et al.

Published: Jan. 5, 2024

Abstract. Humic-like substances (HULIS) are complex macromolecules in water-soluble organic compounds containing multiple functional groups, and transition metal ions (TMs) ubiquitous atmospheric particles. In this study, potential physical chemical interactions between HULIS four TM species including Cu2+, Mn2+, Ni2+, Zn2+ were analyzed by optical method under acidic, weakly acidic neutral conditions. The results showed that only slightly enhanced mass absorption efficiency (MAE365) of winter, had indiscernible effects on Ångström exponent (AAE) both seasons all acidity All TMs fluorescence quenching winter HULIS, Cu2+ similar summer with the highest coefficients found condition seasons. 1H-nuclear magnetic resonance (1H-NMR) Fourier-transform infrared (FT-IR) spectra revealed mainly bound aromatic tightened molecule structures HULIS. parallel factor analysis (PARAFAC) extracted components low-oxidized humic-like (C1), N-containing (C2), highly-oxidized (C3), mixing residentials (C4), from summer. divergent variations spectral additions three conditions indicated electron-donating groups corresponded to C1 C3, binding replacing proton, while electron-withdrawing could correspond C2, its connection through electrostatic adsorption or colliding induced energy transfer.

Language: Английский

Citations

1
Research progress on the characteristics, sources, and environmental and potential health effects of water-soluble organic compounds in atmospheric particulate matter DOI

Linxiao Wang,

Ke Gao, Wei Li

et al.

Environmental Science and Pollution Research, Journal Year: 2024, Volume and Issue: 31(8), P. 11472 - 11489

Published: Jan. 10, 2024

Language: Английский

Citations

1
pH-dependent spectra of particulate water-soluble organic carbon (WSOC) from typical emission sources using EEM-PARAFAC and 2D-COS DOI
Yuanyuan Qin, Kang Xiao, Ziyin Zhang

et al.

Atmospheric Environment, Journal Year: 2022, Volume and Issue: 287, P. 119262 - 119262

Published: July 1, 2022

Language: Английский

Citations

6
Atmospheric humic-like substances (HULIS) in Chongqing, Southwest China: Abundance, light absorption properties, and potential sources DOI

Tian Tang,

Huanbo Wang,

Hongli Tao

et al.

Atmospheric Research, Journal Year: 2023, Volume and Issue: 295, P. 107016 - 107016

Published: Sept. 13, 2023

Language: Английский

Citations

3
Compact fiber sensor for rapid trypsin detection based on the whispering gallery mode with a liquid crystal microdroplet DOI

Zhenyu Ma,

Jing Sun, Xiaolan Li

et al.

Sensors and Actuators B Chemical, Journal Year: 2023, Volume and Issue: 402, P. 135125 - 135125

Published: Dec. 12, 2023

Language: Английский

Citations

3
Molecular-level transformations of biomass burning-derived water-soluble organic carbon during dark aqueous OH oxidation: Insights from absorption, fluorescence, high-performance size exclusion chromatography and high-resolution mass spectrometry analysis DOI

Xingjun Fan,

Shuwen Xie,

Xufang Yu

et al.

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 912, P. 169290 - 169290

Published: Dec. 15, 2023

Language: Английский

Citations

2
Highly Acidic Conditions Drastically Alter the Chemical Composition and Absorption Coefficient of α-Pinene Secondary Organic Aerosol DOI Creative Commons
Cynthia Wong, Sijia Liu, Sergey A. Nizkorodov

et al.

ACS Earth and Space Chemistry, Journal Year: 2022, Volume and Issue: 6(12), P. 2983 - 2994

Published: Nov. 22, 2022

Secondary organic aerosols (SOA), formed through the gas-phase oxidation of volatile compounds (VOCs), can reside in atmosphere for many days. The formation SOA takes place rapidly within hours after VOC emissions, but undergo much slower physical and chemical processes throughout their lifetime atmosphere. acidity atmospheric spans a wide range, with most acidic particles having negative pH values, which promote acid-catalyzed reactions. goal this work is to elucidate poorly understood mechanisms rates aging mixtures representative compounds. were generated by ozonolysis α-pinene continuous flow reactor then collected using foil substrate. samples extracted aged exposure varying concentrations aqueous H2SO4 1-2 Chemical analysis fresh was conducted ultra-performance liquid chromatography coupled photodiode array spectrophotomety high-resolution mass spectrometry. In addition, UV-vis spectrophotometry fluorescence used examine changes optical properties before aging. We observed that moderately conditions (pH from 0 4) experienced small composition, while highly environment -1 0) more dramatic including containing sulfur. Additionally, at conditions, light-absorbing fluorescent appeared, identities could not be ascertained due relative abundance. This study shows major driver aging, resulting large change composition regions where high persist, such as upper troposphere lower stratosphere.

Language: Английский

Citations

4