Evaluating the contributions of different organic matter sources to urban river water during a storm event via optical indices and molecular composition

Lee, Mi-Hee; Lee, Yun Kyung; Derrien, Morgane; Choi, Kwang-Soon; Shin, Kyung‐Hoon; Jang, Kyoung-Soon; Hur, Jin

doi:10.1016/j.watres.2019.115006

Cited by 76 publications

(14 citation statements)

References 51 publications

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“…Sites S1, S8, and S9 stand out on the right-hand side of the x -axis, dominated by humiclike FDOM intensity and CDOM absorption coefficients. Samples from S8 and S9 were collected poststorm, implying that pulses of high-flow events carry more terrestrial-derived DOM from surrounding catchments into rivers, consistent with prior studies that terrestrial aromatic and polyphenolic compounds were quickly flushed into fluvial networks. − Characteristic of a relatively higher elevation, sites S1–S7 are scatted on the top part of the y -axis dominated by FI, BIX, and FDOM composition. The remainder sites are clustered very closely, implying rather similar DOM optical properties (UV–vis and EEM-PARAFAC) dominated by smaller-molecular-weight CDOM and proteinlike fluorescence.…”

Section: Discussionsupporting

confidence: 73%

“…Agricultural land use is intense (>50%) at the lower elevation of the Himalayan south slope, which is expected to affect riverine DOM characteristics. Agriculture has been found to impact fluvial DOM composition by producing more low-molecular-weight microbially derived DOM triggered by abundant nutrient inputs into fluvial ecosystems. − In addition, hydrology has been found to affect DOM sources and composition. − The steep gradients in a mountainous watershed can potentially amplify the influences of agricultural land use and hydrology on DOM sources and composition.…”

Section: Introductionmentioning

confidence: 99%

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Characteristics of Dissolved Organic Matter from a Transboundary Himalayan Watershed: Relationships with Land Use, Elevation, and Hydrology

Chen

Zeng

Zhang

et al. 2020

ACS Earth Space Chem.

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Himalayan rivers play pivotal roles in regional water and food supplies, global sediments, and carbon budgets. We studied a transboundary mountainous Kosi River in the Himalayas by utilizing ultraviolet–visible spectroscopy and excitation–emission matrix coupled with parallel factor analysis. We have found that agricultural land use promoted the production of abundant proteinlike fluorescence in the surface waters [∼1.1–1.8 Raman unit (RU) for two proteinlike components that accounts for ≥97% of relative abundance] as opposed to natural vegetation land cover (e.g., forests and grasslands), despite the low dissolved organic carbon (DOC, 0.50–1.02 mg L–1), implying more reactive fluorescent dissolved organic matter (FDOM) that can potentially cause more CO2 outgassing. Furthermore, we observed a decreasing trend of slope ratio (S R) and proteinlike fluorescence with elevation as opposed to a humiclike component, potentially due to more concentrated croplands and consequent nutrient inputs to rivers at lower elevations. In addition, poststorm samples shifted to more humiclike FDOM and chromophoric DOM (CDOM) sides compared to baseflow water. These findings highlighted the importance of land uses and other environmental conditions, such as elevation and hydrology, on DOM characteristics and dynamics and water quality, which can potentially be amplified due to the steep gradients in mountainous watersheds. Measures should be taken for proper and sustainable land uses to mitigate river water eutrophication and pollution and to protect drinking water sources for millions of populations.

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Section: Discussionsupporting

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Characteristics of Dissolved Organic Matter from a Transboundary Himalayan Watershed: Relationships with Land Use, Elevation, and Hydrology

Chen

Zeng

Zhang

et al. 2020

ACS Earth Space Chem.

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“…In this regard, the combination of fluorescence spectroscopy with UHR-MS not only affords more comprehensive information but also increases the understanding of EOM (Derrien et al, 2017;He et al, 2016;Osterholz et al, 2015;Perminova et al, 2019;Tfaily, Corbett, Wilson, et al, 2015). Lee et al (2019) evaluated the change in the composition of DOM and contributions of different organic sources to an urban river during a storm via fluorescence index-based end-member mixing analysis (EEMA) and FT-ICR MS. A new assessment tool for the molecular characterization of DOM was proposed by correlating both the EEMA data and elemental formulae obtained by FT-ICR MS (Herzsprung et al, 2012). Multiple analytical techniques such as fluorescence and FT-ICR MS were utilized for the in-depth assessment of structural and composition changes of DOM after SPE (Chen, Kim, Park, Jung, et al, 2016;Herzsprung et al, 2017).…”

Section: Orthogonal Approaches For Structural Identificationmentioning

confidence: 99%

Analysis of environmental organic matters by Ultrahigh‐Resolution mass spectrometry—A review on the development of analytical methods

Kim

Jung

et al. 2021

Mass Spectrometry Reviews

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Owing to the increasing environmental and climate changes globally, there is an increasing interest in the molecular-level understanding of environmental organic compound mixtures, that is, the pursuit of complete and detailed knowledge of the chemical compositions and related chemical reactions.Environmental organic molecule mixtures, including those in air, soil, rivers, and oceans, have extremely complex and heterogeneous chemical compositions. For their analyses, ultrahigh-resolution and sub-ppb level mass accuracy, achievable using Fourier-transform ion cyclotron resonance mass spectrometry (FT-ICR MS), are important. FT-ICR MS has been successfully used to analyze complex environmental organic molecule mixtures such as natural, soil, particulate, and dissolved organic matter. Despite its success, many limitations still need to be overcome. Sample preparation, ionization, structural identification, chromatographic separation, and data interpretation are some key areas that have been the focus of numerous studies. This review describes key developments in analytical techniques in these areas to aid researchers seeking to start or continue investigations for the molecular-level understanding of environmental organic compound mixtures.

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“…The spectroscopic techniques are important tools for the identification of the origin of the organic matter in water bodies, which can be allochthonous, i.e., produced outside the system and carried by runoff, or autochthonous. Another important role is related to the possibility of identification of natural processes of modification of the organic matter, which results in the classification of refractory pedogenic and composed of aromatic chains, or aliphatic aquagenic and composed of simpler aliphatic chains (Lee et al 2019).…”

Section: Organic Matter: Composition Chemistry and Quantificationmentioning

confidence: 99%

The importance of organic carbon as a coadjutant in the transport of pollutants

Iubel

Braga

2021

Water Science and Technology

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Dissolved organic carbon is a physicochemical parameter widely used in the evaluation of surface water quality, however, its role as an agent of transport and transference of pollutants sometimes is still disregarded. The DOC heterogeneous composition, predominantly composed of humin, humic and fulvic acids, renders it an inherent capacity to bound to organic and inorganic pollutants. This is an important feature when the knowledge of present and future conditions of aquatic environments is of concern. Some authors concluded that DOC is a controlling agent of mobility of metals, phosphorus, herbicides, and pesticides, among others. Nevertheless, some physical and chemical conditions in the water column and in the sediment can immobilize the contaminants and make the DOC less soluble, which will hamper the formation of DOC-pollutant complexes. This mini review is intended to present the importance of DOC quantification and some information on its association with water contaminants, which could render them unavailable for uptaking.

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Evaluating the contributions of different organic matter sources to urban river water during a storm event via optical indices and molecular composition

Cited by 76 publications

References 51 publications

Characteristics of Dissolved Organic Matter from a Transboundary Himalayan Watershed: Relationships with Land Use, Elevation, and Hydrology

Characteristics of Dissolved Organic Matter from a Transboundary Himalayan Watershed: Relationships with Land Use, Elevation, and Hydrology

Analysis of environmental organic matters by Ultrahigh‐Resolution mass spectrometry—A review on the development of analytical methods

The importance of organic carbon as a coadjutant in the transport of pollutants

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