Spectroscopic and Molecular-Level Characteristics of Dissolved Organic Matter in a Highly Polluted Urban River in South China DOI
Quanhui Ye,

Ziting Zhang,

Yuchen Liu

et al.

ACS Earth and Space Chemistry, Journal Year: 2019, Volume and Issue: 3(9), P. 2033 - 2044

Published: July 30, 2019

China is undergoing unprecedented rapid urbanization, which accompanied by the formation of more than 2000 black and odorous urban rivers. Dissolved organic matter (DOM) an essential component in aquatic ecosystems regulates carbon nutrient cycle, but its characteristics highly polluted rivers are still not well understood. Here, water samples from mainstream, tributaries, ponds, reservoirs within urbanized Maozhou River watershed (Shenzhen, China) were analyzed using absorption fluorescence spectroscopy, stable isotope analysis, Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) to explore impact urbanization on DOM characteristics. The results showed elevated dissolved concentrations disturbed waters (mainstream, tributary, pond) compared those reservoir water. Results spectroscopic, isotopic, FT-ICR MS analyses suggest that had lower aromaticity, average molecular weight, plant- soil-derived terrestrial (e.g., lignin-like) contributions greater microbial-derived protein-like anthropogenic sulfur-containing compounds synthetic surfactants) DOM. These strengthened upper implies downstream waters. Point-source wastewater effluent input caused increases level mainstream abrupt changes with very strong distinct chemistry natural highlights a potentially cycle ecosystems.

Language: Английский

Molecular compositions and optical properties of dissolved brown carbon in biomass burning, coal combustion, and vehicle emission aerosols illuminated by excitation–emission matrix spectroscopy and Fourier transform ion cyclotron resonance mass spectrometry analysis DOI Creative Commons
Jiao Tang, Jun Li, Tao Su

et al.

Atmospheric chemistry and physics, Journal Year: 2020, Volume and Issue: 20(4), P. 2513 - 2532

Published: March 2, 2020

Abstract. Brown carbon (BrC) plays an essential impact on radiative forcing due to its ability absorb sunlight. In this study, the optical properties and molecular characteristics of water-soluble methanol-soluble organic (OC; MSOC) emitted from simulated combustion biomass coal fuels vehicle emissions were investigated using ultraviolet–visible (UV–vis) spectroscopy, excitation–emission matrix (EEM) Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) coupled with electrospray ionization (ESI). The results showed that these smoke aerosol samples burning (BB) (CC) had a higher absorption efficiency at 365 nm (MAE365) than emission samples. A stronger MAE365 value was also found in MSOC (WSOC), indicating low polar compounds would possess light capacity. Parallel factor (PARAFAC) analysis identified six types fluorophores (P1–6) WSOC including two humic-like substances (HULIS-1) (P1 P6), three protein-like (PLOM) (P2, P3, P5), one undefined substance (P4). HULIS-1 mainly aging exhaust particles; P2 only abundant BB aerosols; P3 ubiquitous all tested P4 fossil P5 more intense fresh particles. chromophores (six components; C1–6) exhibited consistent WSOC, suggesting method could be used indicate origins chromophores. FT-ICR spectra CHO CHON most components but S-containing appeared abundance CC aerosols aerosols, while considerably fewer largely detected MSOC. unique formulas different sources van Krevelen (VK) diagram presented distributions. To specific, medium H ∕ C O ratio, opposite ratio. Moreover, capacity positively associated unsaturation degree weight source aerosols. above are potentially applicable further studies EEM-based or molecular-characteristic-based apportionment atmospheric

Language: Английский

Citations

186
Transformation of dissolved organic matter during full-scale treatment of integrated chemical wastewater: Molecular composition correlated with spectral indexes and acute toxicity DOI
Bingliang Zhang, Chao Shan,

Zhineng Hao

et al.

Water Research, Journal Year: 2019, Volume and Issue: 157, P. 472 - 482

Published: April 5, 2019

Language: Английский

Citations

168
Aqueous secondary organic aerosol formation from the direct photosensitized oxidation of vanillin in the absence and presence of ammonium nitrate DOI Creative Commons

Brix Raphael Go,

Yan Lyu, Yan Ji

et al.

Atmospheric chemistry and physics, Journal Year: 2022, Volume and Issue: 22(1), P. 273 - 293

Published: Jan. 10, 2022

Abstract. Vanillin (VL), a phenolic aromatic carbonyl abundant in biomass burning emissions, forms triplet excited states (3VL∗) under simulated sunlight leading to aqueous secondary organic aerosol (aqSOA) formation. Nitrate and ammonium are among the main components of aerosols cloud or fog water. Under atmospherically relevant conditions, solutions composed either VL only with nitrate were subjected irradiation compare aqSOA formation via direct photosensitized oxidation absence presence nitrate. The reactions characterized by examining decay kinetics, product compositions, light absorbance changes. Both conditions generated oligomers, functionalized monomers, oxygenated ring-opening products, promoted functionalization nitration, likely due its photolysis products (⚫OH, ⚫NO2, NO2- HONO). Moreover, potential imidazole derivative observed suggested that participated reactions. majority most from both brown carbon (BrC) chromophores. effects oxygen (O2), pH, reactants concentration molar ratios on also explored. Our findings show O2 plays an essential role reactions, oligomer was enhanced at pH <4. Also, dominant low concentrations, whereas oligomerization favored high concentrations. Furthermore, oligomers hydroxylated detected guaiacol (a non-carbonyl phenol) Last, pathways proposed. This study indicates may be important source areas influenced underscores importance aqueous-phase processing carbonyls.

Language: Английский

Citations

82
Microbial metabolism influences microplastic perturbation of dissolved organic matter in agricultural soils DOI Creative Commons

Xinran Qiu,

Sirui Ma,

Jianrui Pan

et al.

The ISME Journal, Journal Year: 2024, Volume and Issue: 18(1)

Published: Jan. 1, 2024

Abstract An estimated 258 million tons of plastic enter the soil annually. Joining persistent types microplastic (MP), there will be an increasing demand for biodegradable plastics. There are still many unknowns about pollution by either type, and one large gap is fate composition dissolved organic matter (DOM) released from MPs as well how they interact with microbiomes in agricultural systems. In this study, polyethylene MPs, photoaged to different degrees, virgin polylactic acid were added at levels incubated 100 days address knowledge gap. We find that, upon MP addition, labile components low aromaticity degraded transformed, resulting increased oxidation degree, reduced molecular diversity, changed nitrogen sulfur contents DOM. Terephthalate, acetate, oxalate, L-lactate DOM 4-nitrophenol, propanoate, nitrate major molecules available microbiomes. The bacteria involved metabolism mainly concentrated Proteobacteria, Actinobacteriota, Bacteroidota, fungi Ascomycota Basidiomycota. Our study provides in-depth understanding microbial transformation its effects evolution soils.

Language: Английский

Citations

35
Identification of species and sources of atmospheric chromophores by fluorescence excitation-emission matrix with parallel factor analysis DOI
Qingcai Chen, Jinwen Li, Xiaoyu Hua

et al.

The Science of The Total Environment, Journal Year: 2020, Volume and Issue: 718, P. 137322 - 137322

Published: Feb. 14, 2020

Language: Английский

Citations

127
Molecular Characterization of Water- and Methanol-Soluble Organic Compounds Emitted from Residential Coal Combustion Using Ultrahigh-Resolution Electrospray Ionization Fourier Transform Ion Cyclotron Resonance Mass Spectrometry DOI
Jianzhong Song,

Meiju Li,

Xingjun Fan

et al.

Environmental Science & Technology, Journal Year: 2019, Volume and Issue: 53(23), P. 13607 - 13617

Published: Nov. 4, 2019

Water-soluble organic compounds (WSOC) and methanol-soluble (MSOC) in smoke particles emitted from residential coal combustion were characterized by ultrahigh-resolution mass spectrometry. The results showed that the molecular compositions of WSOC MSOC are different. S-containing (CHOS CHONS) found to be dominant components (65-87%) WSOC, whereas CHO CHON make a great contribution (79-96%) samples. It is worth noting greater abundance was produced compared biomass burning atmospheric also varied significantly depending on maturity coal. derived low-maturity contained higher proportion oxidized functional groups but with lower degree aromaticity than high-maturity Our findings suggest molecules high modified index, low O/C ratio, polarity stronger light absorption. This study suggests contributed absorption may stronger.

Language: Английский

Citations

126
Fluorescence characteristics of water-soluble organic carbon in atmospheric aerosol☆ DOI
Guangming Wu, Pingqing Fu, Kirpa Ram

et al.

Environmental Pollution, Journal Year: 2020, Volume and Issue: 268, P. 115906 - 115906

Published: Oct. 20, 2020

Language: Английский

Citations

115
Linking microbial community structure with molecular composition of dissolved organic matter during an industrial-scale composting DOI

Jiangang Che,

Yudan Bai,

Xi Li

et al.

Journal of Hazardous Materials, Journal Year: 2020, Volume and Issue: 405, P. 124281 - 124281

Published: Oct. 15, 2020

Language: Английский

Citations

106
Dissolved organic matter characteristics in soils of tropical legume and non-legume tree plantations DOI
Quanhui Ye, Yinghui Wang,

Ziting Zhang

et al.

Soil Biology and Biochemistry, Journal Year: 2020, Volume and Issue: 148, P. 107880 - 107880

Published: June 7, 2020

Language: Английский

Citations

90
Molecular Characterization of Nitrogen-Containing Compounds in Humic-like Substances Emitted from Biomass Burning and Coal Combustion DOI
Jianzhong Song,

Meiju Li,

Chunlin Zou

et al.

Environmental Science & Technology, Journal Year: 2021, Volume and Issue: 56(1), P. 119 - 130

Published: Dec. 9, 2021

N-containing organic compounds (NOCs) in humic-like substances (HULIS) emitted from biomass burning (BB) and coal combustion (CC) were characterized by ultrahigh-resolution mass spectrometry the positive electrospray ionization mode. Our results indicate that NOCs include CHON+ CHN+ groups, which are detected as a substantial fraction both BB- CC-derived HULIS, suggest not only BB but also CC is potential important source of atmosphere. The mainly consist reduced nitrogen with other oxygenated functional straw- coal-smoke HULIS exhibit lower degree oxidation than pine-smoke HULIS. In addition, higher N atoms (N2 and/or N3) generally bear modified aromaticity index (AImod) values contained especially straw-smoke whereas atom (N1) always have relatively AImod dominant These findings imply primary emission may be significant N1 compounds, high number (e.g., N2–3) could associated materials. Further study warranted to distinguish more sources.

Language: Английский

Citations

85