Changes in the compound classes of dissolved organic matter along an estuarine transect: A study using FTIR and 13C NMR

Abdulla, Hussain; Minor, Elizabeth C.; Dias, Robert F.; Hatcher, Patrick G.

doi:10.1016/j.gca.2010.04.006

Cited by 187 publications

(140 citation statements)

References 99 publications

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“…The freshwater DOM (river and reservoir DOM) contained much more alkyl C than the seawater DOM (coastal and marine DOM; Fig. 4B), which was also consistent with the other investigations on the alkyl C of HMW DOM in the Chesapeake Bay and the Florida Bay (Abdulla et al, 2010;Maie et al, 2005). The most abundant alkyl C was observed in the reservoir Koprivnjak et al (2009).…”

Section: Comparison Between the Ro Dom And Hmw Domsupporting

confidence: 90%

“…The riverine DOM in this investigation contained much less alkoxyl C (60-109 ppm) than the marine DOM, which was consistent with the comparison of HMW DOM (Abdulla et al, 2010;Maie et al, 2005). The dissimilarity between riverine and marine DOM was likely related to the DOM sources.…”

Section: Comparison Between the Ro Dom And Hmw Domsupporting

confidence: 83%

“…Thus, it is not surprising that the river and reservoir DOM contained higher aromatic C than marine DOM did. This was also observed for HMW DOM (Abdulla et al, 2010;Maie et al, 2005). It is noted that the peak at 45-60 ppm for the marine DOM was largely attributed to NCH (Mao et al, 2012), rather than methoxyl C of lignin.…”

Section: Comparison Between the Ro Dom And Hmw Dommentioning

confidence: 55%

“…4B). In contrast, the carboxyl C contents of HMW DOM in freshwater were higher than in seawater (Abdulla et al, 2010;Maie et al, 2005). This observation suggested that a significant fraction of carboxyl C may be present in LMW DOM in oceans.…”

Section: Comparison Between the Ro Dom And Hmw Dommentioning

confidence: 80%

“…Although the sample set is not large, it provides an initial comparison of the total DOM from various aqueous environments. Furthermore, this comparison, combined with the compositional changes of HMW DOM (Abdulla et al, 2010;Maie et al, 2005), exerts an important constraint on size and chemical transformation of DOM. The freshwater DOM (river and reservoir DOM) contained much more alkyl C than the seawater DOM (coastal and marine DOM; Fig.…”

Section: Comparison Between the Ro Dom And Hmw Dommentioning

confidence: 99%

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Compositions and constituents of freshwater dissolved organic matter isolated by reverse osmosis

Huang

Ran

Mao

2014

Marine Pollution Bulletin

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a b s t r a c tDissolved organic matter (DOM) from riverine and lacustrine water was isolated using a reverse osmosis (RO) system. Solid-state 13 C nuclear magnetic resonance ( 13 C NMR) was used to quantitatively evaluate the compositions and constituents of DOM, which are compared with previous investigations on marine DOM. Results indicated that concentration factor (CF) was a key metric controlling yield and sorption of DOM on the RO system. The sorption was likely non-selective, based on the 13 C NMR and d 13 C analyses. Carbohydrates and lipids accounted for 25.0-41.5% and 30.2-46.3% of the identifiable DOM, followed by proteins (18.2-19.8%) and lignin (7.17-12.8%). The freshwater DOM contained much higher alkyl and aromatic C but lower alkoxyl and carboxyl C than marine DOM. The structural difference was not completely accounted for by using structure of high molecular weight (HMW) DOM, suggesting a size change involved in transformations of DOM during the transport from rivers to oceans.

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Section: Comparison Between the Ro Dom And Hmw Domsupporting

confidence: 90%

Section: Comparison Between the Ro Dom And Hmw Domsupporting

confidence: 83%

Section: Comparison Between the Ro Dom And Hmw Dommentioning

confidence: 55%

Section: Comparison Between the Ro Dom And Hmw Dommentioning

confidence: 80%

Section: Comparison Between the Ro Dom And Hmw Dommentioning

confidence: 99%

See 3 more Smart Citations

Compositions and constituents of freshwater dissolved organic matter isolated by reverse osmosis

Huang

Ran

Mao

2014

Marine Pollution Bulletin

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Modeling rates of DOC degradation using DOM composition and hydroclimatic variables

Moody

Worrall

2017

JGR Biogeosciences

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The fluvial fluxes of dissolved organic carbon (DOC) from peatlands form an important part of that ecosystem's carbon cycle, contributing approximately 35% of the overall peatland carbon budget. The in‐stream processes acting on the DOC, such as photodegradation and biodegradation, can lead to DOC loss and thus contribute CO2 to the atmosphere. The aim of this study was to understand what controls the rates of DOC degradation. Water samples from a headwater, peat‐covered catchment, were collected over a 23 month period and analyzed for the DOC degradation rate and dissolved organic matter (DOM) composition in the context of hydroclimatic monitoring. Measures of DOM composition included 13C solid‐state nuclear magnetic resonance spectroscopy, bomb calorimetry, and elemental analysis. Regression analysis showed that there was a significant role for the composition of the DOM in controlling degradation with degradation rates significantly increasing with the proportion of aldehyde and carboxylic acid functional groups but decreasing with the proportion of N‐alkyl functional groups. The highest rates of DOC degradation occurred when aldehyde functionality was at its greatest and this occurred on the recession limb of storm hydrographs. Including this knowledge into models of fluvial carbon fate for an 818 km2 catchment gave an annual average DOC removal rate of 67% and 50% for total organic carbon, slightly lower than previously predicted. The compositional controls suggest that DOM is primarily being used as a ready energy source to the aquatic ecosystem rather than as a nutrient source.

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Characterization of Functional Groups in Estuarine Dissolved Organic Matter by DNP‐enhanced ¹⁵N and ¹³C Solid‐State NMR

Venel¹,

Nagashima

Rankin

et al. 2021

ChemPhysChem

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Estuaries are key ecosystems with unique biodiversity and are of high economic importance. Along the estuaries, variations in environmental parameters, such as salinity and light penetration, can modify the characteristics of dissolved organic matter (DOM). Nevertheless, there is still limited information about the atomic-level transformations of DOM in this ecosystem. Solidstate NMR spectroscopy provides unique insights into the nature of functional groups in DOM. A major limitation of this technique is its lack of sensivity, which results in experimental time of tens of hours for the acquisition of 13 C NMR spectra and generally precludes the observation of 15 N nuclei for DOM. We show here how the sensitivity of solid-state NMR experiments on DOM of Seine estuary can be enhanced using dynamic nuclear polarization (DNP) under magic-angle spinning. This technique allows the acquisition of 13 C NMR spectra of these samples in few minutes, instead of hours for conventional solidstate NMR. Both conventional and DNP-enhanced 13 C NMR spectra indicate that the 13 C local environments in DOM are not strongly modified along the Seine estuary. Furthermore, the sensitivity gain provided by the DNP allows the detection of 15 N NMR signal of DOM, in spite of the low nitrogen content. These spectra reveal that the majority of nitrogen is in the amide form in these DOM samples and show an increased disorder around these amide groups near the mouth of the Seine.

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Changes in the compound classes of dissolved organic matter along an estuarine transect: A study using FTIR and 13C NMR

Cited by 187 publications

References 99 publications

Compositions and constituents of freshwater dissolved organic matter isolated by reverse osmosis

Compositions and constituents of freshwater dissolved organic matter isolated by reverse osmosis

Modeling rates of DOC degradation using DOM composition and hydroclimatic variables

Characterization of Functional Groups in Estuarine Dissolved Organic Matter by DNP‐enhanced ¹⁵N and ¹³C Solid‐State NMR

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Changes in the compound classes of dissolved organic matter along an estuarine transect: A study using FTIR and 13C NMR

Cited by 187 publications

References 99 publications

Compositions and constituents of freshwater dissolved organic matter isolated by reverse osmosis

Compositions and constituents of freshwater dissolved organic matter isolated by reverse osmosis

Modeling rates of DOC degradation using DOM composition and hydroclimatic variables

Characterization of Functional Groups in Estuarine Dissolved Organic Matter by DNP‐enhanced 15N and 13C Solid‐State NMR

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Characterization of Functional Groups in Estuarine Dissolved Organic Matter by DNP‐enhanced ¹⁵N and ¹³C Solid‐State NMR