Fluorescent matter in the eastern Atlantic Ocean. Part 1: method of measurement and near-surface distribution

Determann, S.; Reuter, R.; Wagner, Peter; Willkomm, R.

doi:10.1016/0967-0637(94)90048-5

Cited by 129 publications

(75 citation statements)

References 17 publications

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“…Two groups of fluorophoric material were detected in all samples: the first, excited at 280 nm, exhibited an emission maximum at 340-350 nm; this fluorescence has been attributed to proteinaceous material and it should be mainly due to the tryptophan and tyrosine structures as previously reported (Mopper and Schultz, 1993;Determann et al, 1994;Seritti et al, 1994a). The second, excited at 355 nm, exhibited an emission maximum at 450-460 nm and it should be attributed to unidentified 'humic like' structures.…”

Section: Fluorescence Propertiesmentioning

confidence: 69%

DOC, absorption and fluorescence properties of estuarine and coastal waters of the Northern Tyrrhenian Sea

Seritti¹,

Russo²,

Nannicini³

et al. 1998

Chemical Speciation & Bioavailability

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Section: Fluorescence Propertiesmentioning

confidence: 69%

DOC, absorption and fluorescence properties of estuarine and coastal waters of the Northern Tyrrhenian Sea

Seritti¹,

Russo²,

Nannicini³

et al. 1998

Chemical Speciation & Bioavailability

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“…The AG model shared two components with a five-component PARAFAC model explaining florescence DOM collected from five of the major Arctic rivers sampled here over 2004(Walker et al, 2013. AG6 was similar (TCC > 0.95) to C1 from this model (Walker et al, 2013), while AG7 was identical to C5, which can be described as tryptophan-like and has been commonly associated with biological production in surface waters (Determann et al, 1994).…”

Section: Parallel Factor Analysis (Parafac)mentioning

confidence: 99%

Pan-Arctic Trends in Terrestrial Dissolved Organic Matter from Optical Measurements

et al. 2016

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Climate change is causing extensive warming across Arctic regions resulting in permafrost degradation, alterations to regional hydrology and shifting amounts and composition of dissolved organic matter (DOM) transported by streams and rivers. Here, we characterize the DOM composition and optical properties of the six largest Arctic rivers draining into the Arctic Ocean to examine the ability of optical measurements to provide meaningful insights into terrigenous carbon export patterns and biogeochemical cycling. The chemical composition of aquatic DOM varied with season, spring months were typified by highest lignin phenol and dissolved organic carbon (DOC) concentrations with greater hydrophobic acid content, and lower proportions of hydrophilic compounds, relative to summer and winter months. Chromophoric DOM (CDOM) spectral slope (S 275-295 ) tracked seasonal shifts in DOM composition across river basins. Fluorescence and parallel factor analysis identified seven components across the six Arctic rivers. The ratios of "terrestrial humic-like" vs. "marine humic-like" fluorescent components co-varied with lignin monomer ratios over summer and winter months, suggesting fluorescence may provide information on the age and degradation state of riverine DOM. CDOM absorbance (a 350 ) proved a sensitive proxy for lignin phenol concentrations across all six river basins and over the hydrograph, enabling for the first time the development of a single pan-arctic relationship between a 2 350 and terrigenous DOC (R = 0.93). Combining this lignin proxy with high-resolution monitoring of a 350 , pan-arctic estimates of annual lignin flux were calculated to range from 156 to 185 Gg, resulting in shorter and more constrained estimates of terrigenous DOM residence times in the Arctic Ocean (spanning 7 months to 2½ years). Furthermore, multiple linear regression models incorporating both absorbance and fluorescence variables proved capable of explaining much of the variability in lignin composition across rivers and seasons. Our findings suggest that synoptic, high-resolution optical measurements can provide improved understanding of northern high-latitude organic matter cycling and flux, and prove an important technique for capturing future climate-driven changes.

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“…The chemical identity of Class II is unknown. Fluorescence in Class III was reported to be due to the presence of dissolved proteins, derivatives of amino acids, and other heterocyclic compounds containing the indole group, and was referred to as protein-like fluorescence (Traganza, 1969;Mopper and Schultz, 1993;Determann et al, 1994;Coble, 1996).…”

Section: The Typical 3deem Features Of Natural Dommentioning

confidence: 99%

Fluorescence properties of organic ligands for copper(II) in Lake Biwa and its rivers.

Midorikawa

Tanoue

2001

Geochem. J.

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Organic ligands for copper(II) were isolated from lake waters in Lake Biwa and its river waters by immobilized metal ion affinity chromatography (IMAC), and were characterized by three-dimensional excitation/emission matrix spectroscopy (3DEEM) and fluorescence quenching titration. The results show that the contribution of total organic ligands was 0.63-4.68% of the bulk dissolved organic matter (DOM), in terms of UV absorbance, in lake and river waters. Three characteristic excitation/emission (Ex/Em) fluorescence peaks were identified in organic ligands from both lake and river waters, at Ex/Em 310-330/ 374-434 nm (Peak A), 250/414-454 nm (Peak B), and 260-270/306-330 nm (Peak C). Peaks A and B were referred to as humic-like fluorescence, Peak C as protein-like fluorescence. All Ex/Em maxima of organic ligands in lake waters were shifted towards shorter wavelength, and the fluorescence intensities were higher than those in river waters. The results of fluorescence quenching titration show that the IMAC ligands were weak ligands, with conditional stability constants (logK′ CuL ) around 7.27 for river ligands, and 7.84-9.23 for lake ligands. The differences of fluorescence properties indicate the variability of fluorescent ligands between river terrestrial and lake aquatic environments. a significant role in the mobilization and transport of nutrients and pollutants (As, Zn, Cd, Pb, and Ce), and soil weathering in terrestrial ecosystems (Tegen and Dorr, 1996;Li and Shuman, 1997;Kalbitz and Wennrich, 1998). However, most previous studies have only provided concentrations and conditional stability constants of organic ligands, the fundamentals pertaining to the properties of organic ligands are poorly understood since they have never been isolated (Gordon et al., 1996; Tanoue, 1996, 1998).Immobilized metal ion affinity chromatography (IMAC) has been successfully applied to isolate organic ligands for copper(II) from estuarine, coastal and oceanic waters (Gordon, 1992; Gordon INTRODUCTIONNaturally occurring organic ligands have been extensively studied in terms of metal speciation in aquatic environments during the past decades (Tanoue and Midorikawa, 1995). In oceanic waters, copper speciation is controlled by complexation with organic ligands (Donat and Bruland, 1995). In freshwaters, there are at least three ligand classes with logK values ranging from 15 to 8.6 (Xue and Sunda, 1997), which may control the bioavailability, toxicity and speciation of copper. Organic ligands were also reported to be responsible for other trace metal speciation (e.g., Hg) in freshwater (Mantoura et al., 1978), and play 334 F. Wu et al. et al., 1996; Tanoue, 1996, 1998;Donat et al., 1997). 3DEEM and UV-VIS spectroscopy have been demonstrated to be useful methods for characterizing DOM in natural waters (Coble et al., 1990;Mopper and Schultz, 1993;Coble, 1996;Smith and Kramer, 1999;Del Castillo et al., 1999). Absorbing and fluorescing complexes such as humic substances and proteins were expected to be good candidates for organic li...

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Fluorescent matter in the eastern Atlantic Ocean. Part 1: method of measurement and near-surface distribution

Cited by 129 publications

References 17 publications

DOC, absorption and fluorescence properties of estuarine and coastal waters of the Northern Tyrrhenian Sea

DOC, absorption and fluorescence properties of estuarine and coastal waters of the Northern Tyrrhenian Sea

Pan-Arctic Trends in Terrestrial Dissolved Organic Matter from Optical Measurements

Fluorescence properties of organic ligands for copper(II) in Lake Biwa and its rivers.

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