New insight into the applicability of spectroscopic indices for dissolved organic matter (DOM) source discrimination in aquatic systems affected by biogeochemical processes

Lee, Mi-Hee; Osburn, Christopher L.; Shin, Kyung‐Hoon; Hur, Jin

doi:10.1016/j.watres.2018.09.048

Cited by 107 publications

(42 citation statements)

References 67 publications

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“…DOM composition and the anoxic conditions may have suppressed the mineralization rate of permafrost DOM, potentially explaining its high proportion in deep layers of thermokarst bogs. However, several studies have linked higher degradability of DOM to lower aromaticity 6,7,11,56 , and lower degradation states of phenols 6,57 , inferring limited lability of peatland permafrost DOM at our site. However, since no direct measurement were made, the fate of DOM originating from permafrost remains uncertain.…”

Section: Peatland Permafrost Influence On Dom Composition: Link To Pomentioning

confidence: 82%

Contribution of Peatland Permafrost to Dissolved Organic Matter along a Thaw Gradient in North Siberia

Gandois

Hoyt

Hatté

et al. 2019

Environ. Sci. Technol.

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Permafrost peatlands are important carbon stocks currently experiencing rapid evolution after permafrost thaw. Following thaw, dissolved organic matter (DOM) is a potentially important pathway for the release of permafrost carbon. This study investigates the origin and composition of DOM across sites at different stages of thaw in a discontinuous permafrost area of North Siberia. We determine the optical properties, molecular composition, stable (δ 13 C) and radiocarbon (14 C) content of DOM. Early stages of thaw are characterized by high DOC concentrations, high aromaticity, contribution of vegetation-derived DOM, and a high contribution of permafrost carbon. In contrast, in later stages, the microbial contribution to DOM increases, and only modern carbon is detected.

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Section: Peatland Permafrost Influence On Dom Composition: Link To Pomentioning

confidence: 82%

Contribution of Peatland Permafrost to Dissolved Organic Matter along a Thaw Gradient in North Siberia

Gandois

Hoyt

Hatté

et al. 2019

Environ. Sci. Technol.

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“…Our data support that in-situ production mainly releases protein-like substances, as already observed by (Osburn et al, 2012), making their contribution to the total fluorescence increasing from 11.4% in February to 30.1% in July. The high solar irradiance in summer can further contribute to the change in DOM pool not only stimulating biological production, but also leading to the photodegradation of humic-like substances, that are more susceptible to photodegradation than protein-like substances, due to higher MW and the aromaticity degree (Lee et al, 2018).…”

Section: Dom In the River End-membermentioning

confidence: 99%

“…CDOM and FDOM studies, therefore, can be helpful in order to gain qualitative information on DOM pool, such as average aromaticity degree and molecular weight as well as the occurrence of humic-like, fulvic-like and protein-like substances. In the literature, FDOM has been also used to distinguish DOM sources and biological lability (Dainard et al, 2015;Fellman et al, 2011;Galletti et al, 2019;Lee et al, 2018;Osburn et al, 2012;Yamashita et al, 2011). DOM in the oceans contain the largest pool of dissolved organic carbon (DOC) compared to all other ecosystems (Hansell et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Dissolved organic matter dynamics in the pristine Krka River estuary (Croatia)

et al. 2020

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In many estuarine systems, riverine discharge is the main source of dissolved organic matter (DOM). In contrast, karstic Krka River, with self-purifying ability, is characterized by very low DOM concentrations (~30 µM) and a diluting effect on DOM in the estuary. Interestingly, within the estuary a marked in-situ production is observed, particularly in summer. Pristine nature of the estuary makes it a natural laboratory to study the DOM dynamics, originated from 3 sources: the river the seawater and in-situ production. With this work we aim at reporting the first information on DOM dynamics in the Krka estuary in two contrasting seasons, winter and summer 2019. The quality of DOM was assessed using absorbance and fluorescence measurements coupled with PARAFAC analysis. During winter, the estuary is characterized by extremely low DOC concentrations, for which optical properties indicate that is mainly of terrestrial origin. In summer, due to the low riverine discharge and high temperature, DOC concentrations are higher than in winter and a marked increase in absorption and protein-like fluorescence is observed in the estuary. The permanent stratification determines DOC accumulation in the surface layer with values up to 147 µM, suggesting a decoupling between production and removal processes. Our work opens intriguing questions about the main processes responsible for DOC accumulation in this system and highlights the need of new studies combing chemical and biological information.

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“…Specific UV absorbance (SUVA), ascertained as the UV absorbance of a solution at a given wavelength normalized for DOC concentration, is strongly correlated with the degree of aromaticity of DOM (Weishaar et al, 2003). This indicator of DOM aromaticity is often calculated at 254 nm (SUVA 254 ) (Kim et al, 2018;Lee et al, 2018). Numerous studies have shown that the variation of the SUVA 254 descriptor is directly bound to metal complexation.…”

Section: Electronic Spectral Changesmentioning

confidence: 99%

Natural organic matter-cations complexation and its impact on water treatment: A critical review

et al. 2019

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a b s t r a c tThe quality and quantity of natural organic matter (NOM) has been observed to evolve which poses challenges to water treatment facilities. Even though NOM may not be toxic itself, its presence in water has aesthetic effects, enhances biological growth in distribution networks, binds with pollutants and controls the bioavailability of trace metals. Even though NOM has heterogeneous functional groups, the predominant ones are the carboxyl and the phenolic groups, which have high affinities for metals depending on the pH. The properties of both the NOM and the trace elements influence the binding kinetics and preferences. Ca 2þ prefers to bind with the carboxylic groups especially at a low pH while Zn 2þ prefers the amine groups though practically, most cations bind to several functions groups. The nature of the chemical environment (neighboring ligands) the ligand finds itself equally influences its preference for a cation. The presence of NOM, cations or a complex of NOM-cations may have significant impact on the efficiency of water processes such as coagulation, adsorption, ion exchange resin and membrane filtration. In coagulation, the complexation between the coagulant salts and NOM helps to remove NOM from solution. This positive influence can further be enhanced by the addition of Ca 2þ . A negative influence is however, observed in lime-softening method as NOM complexes with Ca 2þ . A negative influence is also seen in membrane filtration where divalent cations partially neutralize the carboxyl functional groups of NOM thereby reducing the repulsion effect on NOM and increasing membrane fouling. The formation of disinfection by-products could either be increased or reduced during chlorination, the speciation of products formed is modified with generally the enhancement of haloacetic acid formation observed in presence of metal cations. This current work, presents in details the interactions of cations and NOM in the environment, the preference of cations for each functional group and the possible competition between cations for binding sites, as well as the possible impacts of the presence of cations, NOM, or their complex on water treatment processes.

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New insight into the applicability of spectroscopic indices for dissolved organic matter (DOM) source discrimination in aquatic systems affected by biogeochemical processes

Cited by 107 publications

References 67 publications

Contribution of Peatland Permafrost to Dissolved Organic Matter along a Thaw Gradient in North Siberia

Contribution of Peatland Permafrost to Dissolved Organic Matter along a Thaw Gradient in North Siberia

Dissolved organic matter dynamics in the pristine Krka River estuary (Croatia)

Natural organic matter-cations complexation and its impact on water treatment: A critical review

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