Dissolved organic matter fluorescence spectroscopy as a tool to estimate biological activity in a coastal zone submitted to anthropogenic inputs

Parlanti, E.; Wörz, K.; Geoffroy, Laurent; Lamotte, M.

doi:10.1016/s0146-6380(00)00124-8

Cited by 755 publications

(501 citation statements)

References 21 publications

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“…FI values typically range from 1.3 to 2.0, i.e., from terrestrial, higher-plant DOM sources to predominant microbial DOM sources. The b:a ratio was calculated as the ratio of the emission intensity measured at 380 nm (b region) divided by the emission intensity maximum recorded between 420 and 435 nm (a region) at an excitation wavelength of 310 nm (Parlanti et al 2000). The b:a ratio-typically ranging from 0.4 to [ 1.0-is an indicator of recently microbially produced DOM, with higher values representing a higher proportion of fresh DOM.…”

Section: Characterization Of Dom Composition From Uvvis and Fluorescementioning

confidence: 99%

Effects of human land use on the terrestrial and aquatic sources of fluvial organic matter in a temperate river basin (The Meuse River, Belgium)

et al. 2017

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The impact of human activities on the concentrations and composition of dissolved organic matter (DOM) and particulate organic matter (POM) was investigated in the Walloon Region of the Meuse River basin (Belgium). Water samples were collected at different hydrological periods along a gradient of human disturbance (50 sampling sites ranging from 8.0 to 20,407 km 2 ) and during a 1.5 year monitoring of the Meuse River at the city of Liège. This dataset was completed by the characterization of the DOM pool in groundwaters. The composition of DOM and POM was investigated through elemental (C:N ratios), isotopic (d 13 C) and optical measurements including excitation emission matrix fluorescence with parallel factor analysis (EEM-PARAFAC). Land use was a major driver on fluvial OM composition at the regional scale of the Meuse Basin, the composition of both fluvial DOM and POM pools showing a shift toward a more microbial/algal and less plant/soil-derived character as human disturbance increased. The comparison of DOM composition between surface and groundwaters demonstrated that this pattern can be attributed in part to the transformation of terrestrial sources by agricultural practices that promote the decomposition of soil organic matter in agricultural lands and subsequent microbial inputs in terrestrial sources. In parallel, human land had contrasting effects on the autochthonous production of DOM and POM. While the in-stream generation of fresh DOM through biological activity was promoted in urban areas, summer autochthonous POM production was not influenced by land use. Finally, soil erosion by agricultural management practices favored the transfer of terrestrial organic matter via the particulate phase. Stable isotope data suggest that the hydrological transfer of terrestrial DOM and POM in humanimpacted catchment are not subject to the same controls, and that physical exchange between these two pools of organic matter is limited.

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Section: Characterization Of Dom Composition From Uvvis and Fluorescementioning

confidence: 99%

Effects of human land use on the terrestrial and aquatic sources of fluvial organic matter in a temperate river basin (The Meuse River, Belgium)

et al. 2017

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“…It is known that macromolecular dissolved organic matter cycles rapidly in coastal regions (Santschi et al, 1995). A fluorescence study of both marine and freshwater samples showed that organic matter freshly excreted by algae may be partially remineralized, but a fraction of the degraded products may be transformed into humic-like matter (Parlanti et al, 2000). A model study developed for the North Adriatic Sea, suggests that this region has significant microbial recycling (Vichi et al, 1998).…”

Section: Determination Of the Relative Acidity Of The Sasmentioning

confidence: 99%

Surface-active properties of organic matter in the North Adriatic Sea

Gašparović

Ćosović

2003

Estuarine, Coastal and Shelf Science

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Characterization of surface-active organic substances has been performed in the North Adriatic Sea, in surface and bottom layers, during the year 2000. Surfaceactive substances (SAS), their hydrophobicity and acidity, were estimated with alternating current voltammetry (in-phase mode) using o-nitrophenol as an electrochemical probe. Depending on hydrophobicity and acidity of present SAS electrochemical characteristics of the o-nitrophenol probe are changing in a specific way. Normalization of the change of prepeak height as an indication of organic matter acidity to shift of peak potential as a measure of hydrophobicity give indication of relative acidity of present SAS. Experiment with model substances showed that humic and fulvic acids contribute the highest to the relative acidity, while biogenic surface-active organic substances as proteins, polysaccharides and lipids contribute lower to the relative acidity.Surface water layer is characterized with higher phytoplankton excretion during whole year concluded from higher contribution of biogenic organic substances to surfactant activity. Humic and fulvic substances dominate in surfactant activity in the bottom layer. Proteinaceous material is found in a heterodispersed fraction during supposed phytoplankton blooms that were in March, July, September and even December, in the Northern Adriatic, connected to unexpectedly high temperatures. Surfactant activity of particulate fraction was found to be mainly less than 10 %. Exceptions were obtained in April and October when surfactant activity of particulate fraction contributed up to 55 and 20 %, respectively. 2

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“…The fluorescence (excitation-emission matrix) properties of allochthonous fulvic acid or humic acid and autochthonous fulvic acid are characterized by differences in peak positions and intensities (Fig. 1a-c) [4,10,11]. [195][196][197][198] Studies revealed that the two fluorescence peaks (C and A) were typically observed for standard SRFA (Fig.…”

Section: Canadian Chemical Transactionsmentioning

confidence: 99%

“…c) of algal origin whilst at least three fluorescence peaks were detected at peak C-region for standard SRHA, possibly the occurrence of high aromaticity in its molecular structure (Fig. 1b) [4,[10][11][12].…”

Section: Canadian Chemical Transactionsmentioning

confidence: 99%

Biological Formation of Organic Substances from Particulate Organic Matter

Mostofa¹,

Liu²,

Minella³

et al. 2015

Can. Chem. Trans.

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Biological degradation of terrestrially derived macromolecules including lignin and cellulose has been shown to produce a large number of environmentally relevant phenolic compounds. It has demonstrated that extracellular superoxide (O 2  ) is produced by heterotrophic bacteria that are common in lakes, soil, hydrothermal vents, marine sediments, estuaries and oceans. Rates of superoxide production normalized to the proportion of metabolically active cells vary between 0.02  0.02 amol cell −1 hour −1 (mean ± standard error) and 19.4  5.2 amol cell −1 hour −1 . Such findings provide insights into the mechanism of two key and yet unclear processes, including the biological degradation of particulate organic matter (POM) that can form dissolved organic substances, and the structural diversification of dissolved organic substances originated from POM such as plant material or algal biomass.

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Dissolved organic matter fluorescence spectroscopy as a tool to estimate biological activity in a coastal zone submitted to anthropogenic inputs

Cited by 755 publications

References 21 publications

Effects of human land use on the terrestrial and aquatic sources of fluvial organic matter in a temperate river basin (The Meuse River, Belgium)

Effects of human land use on the terrestrial and aquatic sources of fluvial organic matter in a temperate river basin (The Meuse River, Belgium)

Surface-active properties of organic matter in the North Adriatic Sea

Biological Formation of Organic Substances from Particulate Organic Matter

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