Revealing the characteristics of dissolved organic matter in urban runoff at three typical regions via optical indices and molecular composition

Liao, Zhenliang; Chu, Jiangyong; Luo, Chongjia; Chen, Hao

doi:10.1016/j.jes.2021.02.012

Cited by 18 publications

(16 citation statements)

References 55 publications

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“…The humification degree of the aquatic systems in NRD and NRU is more significant than HER and HR. The high value of the humification in the water means that more conjugated benzene ring structures, hydrophobic components, and quinone groups, and the π → π * transition of unsaturated organic molecules is more active in DOM [38]. The distribution of S R and E2/E3 among the study areas indicates no significant differences (P>0.05, ANOVA).…”

Section: General Water Quality Indices Analysismentioning

confidence: 91%

Spectral Characteristic Changes of Dissolved Organic Matter in Aquatic Systems Under the Influences of Agriculture and Coal Mining

Chen¹,

Gao²,

Chen³

et al. 2022

Pol. J. Environ. Stud.

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Under the combined influence of various factors, the dissolved organic matter (DOM) in the drainage basin presents complex variation characteristics. In this study, we investigated the spectral characteristics of DOM in the middle reach of the Huai River aquatic systems under the influence of complex conditions (i.e., agricultural nonpoint pollution, coal mining activities, photovoltaics on the water surface, and rural sewage). In addition to the general water quality indices, ultraviolet-visible (UV-Vis) absorption spectroscopy, the excitation-emission matrix spectroscopy (EEMs) combined with the parallel factor analysis (PARAFAC), the fluorescence regional integration (FRI), and the fluorescence indices were used to describe the spectral characteristics of DOM. The results show that agricultural non-point source input from agricultural activities deteriorates water quality, but the coal mining activities weaken the agricultural non-point pollution intensity (i.e., occupy farmland, and subsidence area collected agricultural runoff). The PARAFAC model was composed of the following three chemical components: fulvic-like (C1), humic-like (C2), and tryptophan-like (C3). The results of PRAFAC and FRI indicated that the photovoltaic industry significantly influenced the properties of DOM in the aquatic systems by slowing the photochemical reactions. The principal component analysis (PCA) and Adonis test showed that under different influencing conditions, the aquatic systems within the four study areas showed significant differences. Spectral characteristics of DOM can sensitively indicate water distinction. It is of practical significance to monitor the change characteristics of DOM in a minor watershed under complex influencing factors by spectroscopy.

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Section: General Water Quality Indices Analysismentioning

confidence: 91%

Spectral Characteristic Changes of Dissolved Organic Matter in Aquatic Systems Under the Influences of Agriculture and Coal Mining

Chen¹,

Gao²,

Chen³

et al. 2022

Pol. J. Environ. Stud.

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“…The experimental data (11 precipitation events) are newly sampled, detected, and analyzed. The detailed information of sampling is described in the Supporting Information and the previous literature …”

Section: Methodsmentioning

confidence: 99%

“…Concern about stormwater runoff polluting different environmental compartments is mounting. − The research agenda for characterizing stormwater dissolved organic matter (DOM) in aquatic and terrestrial systems was mainly optical or molecular properties individually, rather than correlations. , Whether it is the source tracing or component identification of DOM, the optical methods lack detailed characterization at the molecular level. ,, Therefore, unraveling the associations can facilitate mutual verification of the two results and further unveil the molecular mechanism of DOM in the environment.…”

Section: Introductionmentioning

confidence: 99%

“…It can be used as a substrate to participate in the metabolism of organisms and the biogeochemical cycles of carbon (C) and nitrogen (N) elements. , Moreover, DOM can interact heavily with organic and inorganic contaminants, influencing their transport, transformation, bioavailability, toxicity, and ultimate fate . Therefore, the characterization of DOM in urban stormwater runoff is of great significance for clarifying its environmental behavior and can provide a scientific basis for reducing and controlling stormwater pollution. , …”

Section: Introductionmentioning

confidence: 99%

“…Several studies have used optical methods and ultrahigh-resolution mass spectrometry to characterize DOM across various environments. ,, Direct comparisons of fluorescence and ultrahigh-resolution MS analyses have suggested that humic-like fluorescence co-varies with aromatic and lignin-like molecules in boreal rivers and water reservoirs. , Nevertheless, molecular-level associations with optical variables of DOM in urban stormwater remain poorly understood, and the molecular basis of DOM that influences its persistence is still deficiently defined. The research, characterizing DOM in urban stormwater runoff by spectroscopy and mass spectrometry separately, found that optical and molecular signatures may be related to each other but have not been revealed effectively.…”

Section: Introductionmentioning

confidence: 99%

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Insights into the Associations between Optical and Molecular Signatures of Dissolved Organic Matter from Urban Stormwater Runoff

et al. 2022

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Modern fluorescence techniques are widely employed to determine the dissolved organic matter (DOM) fluorescent components and quality in urban stormwater runoff. However, its molecular basis is still poorly defined, leading to unclear and unspecific interpretations of fluorescence characterization. This research focused on the correlation analysis between optical and molecular signatures of DOM. The optical parameters are effectively correlated with the individual molecules detected by mass spectrometry. Moreover, molecular characterization parameters are also associated with three-dimensional fluorescence spectroscopy in reverse. Through nonmetric multidimensional scaling (NMDS), the fluorescence indices tracing the source of DOM are effectively categorized and verified by molecular characteristics. Meanwhile, Spearman rank correlation analysis indicated that humic-like components derived from microbial-and tryptophan-like compositions are associated with aromaticity; however, terrestrial humic-like constituents are closely correlated with H/C, O/C, and N/C ratios. In addition, the molecular mechanism of four fluorescent components indicated that the nitrogen (N)-containing components, reduced constituents, and aliphatic compounds are resistant to degradation, while the oxidized and aromatic components are preferentially removed. Those signatures observed for individual molecules are consistent with the bulk characteristics of DOM, as reflected by optical properties.

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Molecular formula assignment of dissolved organic matter by ultra-performance liquid chromatography quadrupole time-of-flight mass spectrometry using two non-targeted data processing approaches: A case study from recirculating aquaculture systems

Aguilar-Alarcón,

Gonzalez,

Mikkelsen

et al. 2024

Analytica Chimica Acta

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Revealing the characteristics of dissolved organic matter in urban runoff at three typical regions via optical indices and molecular composition

Cited by 18 publications

References 55 publications

Spectral Characteristic Changes of Dissolved Organic Matter in Aquatic Systems Under the Influences of Agriculture and Coal Mining

Spectral Characteristic Changes of Dissolved Organic Matter in Aquatic Systems Under the Influences of Agriculture and Coal Mining

Insights into the Associations between Optical and Molecular Signatures of Dissolved Organic Matter from Urban Stormwater Runoff

Molecular formula assignment of dissolved organic matter by ultra-performance liquid chromatography quadrupole time-of-flight mass spectrometry using two non-targeted data processing approaches: A case study from recirculating aquaculture systems

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