Interaction of extrinsic chemical factors affecting photodegradation of dissolved organic matter in aquatic ecosystems

2014 ◽  
Vol 13 (5) ◽  
pp. 799-812 ◽  
Author(s):  
Petr Porcal ◽  
Peter J. Dillon ◽  
Lewis A. Molot
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Aquatic Ecosystems ◽  
Factors Affecting ◽  
Chemical Factors

scholarly journals Heavy-metal pollution alters dissolved organic matter released by bloom-forming Microcystis aeruginosa

RSC Advances ◽  
2017 ◽  
Vol 7 (30) ◽  
pp. 18421-18427 ◽  
Author(s):  
Haiming Wu ◽  
Li Lin ◽  
Guangzhu Shen ◽  
Ming Li
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Microcystis Aeruginosa ◽  
Metal Pollution ◽  
Heavy Metal Pollution ◽  
Aquatic Ecosystems ◽  
Eutrophic Lakes

The risk of heavy metals to aquatic ecosystems was paid much attention in recent years, however, the knowledge on effects of heavy metals on dissolved organic matter (DOM) released byMicrocystiswas quite poor, especially in eutrophic lakes.

Facilitated Heterogeneous Photodegradation of Dissolved Organic Matter by Particulate Iron

2004 ◽  
Vol 1 (3) ◽  
pp. 197 ◽  
Author(s):  
Julia A. Howitt ◽  
Darren S. Baldwin ◽  
Gavin N. Rees ◽  
Barry T. Hart
Keyword(s):  
Organic Matter ◽  
Iron Oxide ◽  
Dissolved Organic Matter ◽  
Iron Oxides ◽  
Aquatic Ecosystems ◽  
Photochemical Reactions ◽  
Freshwater Systems ◽  
Particulate Iron ◽  
Presence And Absence ◽  
Australian Freshwater

Environmental Context. Iron oxides, as suspended minerals or as a colloidal phase, are common in Australian freshwater systems. Freshwater systems are also loaded with carbon-based substances, ‘dissolved organic matter’, but not all is biologically available as food to freshwater organisms. However, photochemical interactions between these iron oxides and dissolved organic matter provide a mechanism for biologically resistant carbon to re-enter the food web. Suspended iron oxides thus need to be considered in carbon cycles in aquatic ecosystems. Abstract. The photochemical degradation of dissolved organic matter (DOM) derived from the leaves of River Red Gum (Eucalyptus camaldulensis) was examined, with a particular focus on the photochemical generation of CO2, consumption of O2, and the effect of particulate iron minerals on these photochemical reactions. Solutions of leaf leachate were irradiated with ultraviolet and visible light in the presence and absence of amorphous iron oxides. Addition of fresh iron oxide was found to increase the rate of photodegradation of the organic matter by up to an order of magnitude compared to the reactions without added iron oxide. The ratio of CO2 produced to O2 consumed was ~1:1 in both the presence and absence of iron oxyhydroxide. The reactivity of the iron oxides was dependent on the preparation method and decreased with increased storage time. These results suggest that photochemical reactions on particle surfaces should be considered when examining carbon transformation in aquatic ecosystems, especially at sites with potential for the production of iron oxyhydroxides.

Surface coating effects on the sorption and dissolution of ZnO nanoparticles in soil

2019 ◽  
Vol 6 (8) ◽  
pp. 2495-2507 ◽  
Author(s):  
Zeinah Elhaj Baddar ◽  
Chris J. Matocha ◽  
Jason M. Unrine
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Soil Ph ◽  
Zno Nanoparticles ◽  
Surface Coating ◽  
Factors Affecting ◽  
Soil P

Soil pH and dissolved organic matter (DOM) content are among the most important factors affecting the bioavailability of Zn and the binding and dissolution of ZnO nanoparticles (NPs).

scholarly journals Biological factors of water quality in a mesotrophic ecosystem

Fisheries ◽  
2021 ◽  
Vol 2021 (1) ◽  
pp. 16-19
Author(s):  
Anatoliy Sadchikov ◽  
Sergei Ostroumov
Keyword(s):  
Water Quality ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Aquatic Environment ◽  
Aquatic Ecosystems ◽  
Biological Factors ◽  
Physiological Processes ◽  
Negative Effect

Dissolved organic matter (DOM) is one of the important parameters of water quality in aquatic ecosystems. In the experiments, phyto- and bacterioplankton actively consumed 14C-labeled chlorella hydrolyzate. Removal (by filtration) of cyanobacteria from the aquatic environment leads to an increase in the rate of DOM consumption by bacteria. This indicates the possibility of a negative effect of cyanobacterial metabolites on the physiological processes of bacterioplankton.

scholarly journals Influence of sea cucumbers on chromophoric of dissolved organic matter in multitrophic aquaculture tanks

2017 ◽  
Author(s):  
Seyed Mohammad Sadeghi-Nassaj ◽  
Teresa S. Catalá ◽  
Pedro A. Álvarez ◽  
Isabel Reche
Keyword(s):  
Water Quality ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Aquatic Ecosystems ◽  
Light Transmission ◽  
Optical Parameters ◽  
Absorption Coefficients ◽  
Sea Cucumbers ◽  
Anemonia Sulcata ◽  
High Concentrations

Background. The effluents of the mono-specific aquaculture contain high concentrations of dissolved nutrients and organic matter, which affect negatively water quality of the recipient aquatic ecosystems. A key feature of water quality is its transparency. Chromophoric dissolved organic matter (CDOM) determines most of the light transmission in the ultraviolet and blue bands in the aquatic ecosystems. A sustainable alternative to mono-specific aquaculture is the integrated multitrophic aquaculture that includes species trophically complementary named “extractive” species. Sea cucumbers are recognized as efficient extractive species, with a high potential to improve water quality, due to the consumption of particulate organic matter (POM). However, the effects of sea cucumbers on CDOM are still unknown. Methods. During one year, we biweekly monitored CDOM in two aquaculture tanks with different trophic structure. One of the tanks (-holothurian tank) only contained the primary species, Anemonia sulcata, whereas the other tank (+ holothurian tank) also contained individuals of Holothuria tubulosa and H. forskali. We routinely performed CDOM absorption spectra from 200 nm to 750 nm and determined quantitative (absorption coefficients at 325 nm) and qualitative (spectral slopes and molar absorption coefficients at 325 nm) optical parameters in the inlet waters, in the tanks, and in their corresponding effluents. Results. Absorption coefficients at 325 nm (a325) and spectral slopes from 275 to 295 nm (S275-295) were significantly lower in the effluents of the +holothurian tank (average: 0.33 and 16 μm-1, respectively) than in the effluents of the −holothurian tank (average: 0.69 m-1 and 34 μm-1, respectively), being the former similar to those found in the inlet waters (average: 0.32 m-1 and 22 μm-1, respectively). This reduction in CDOM absorption appears to be mediated by the POM consumption by the holothurians. The reduction of POM concentration in the +holothurian tank may weaken the process of POM disaggregation into dissolved organic matter, which ultimately might have generated CDOM in the –holothurian tank. Discussion. Extractive species such as holothurians improve water transparency through POM consumption, likely because reduces POM disaggregation into CDOM. We suggest that CDOM monitoring in aquaculture facilities, using automatic probes or even remote sensing, could be a useful tool to trace the effectiveness of extractive species at large scales of time and space.

Increases in humic and bioavailable dissolved organic matter in a forested New England headwater stream with increasing discharge

2016 ◽  
Vol 67 (9) ◽  
pp. 1279 ◽  
Author(s):  
Henry F. Wilson ◽  
Peter A. Raymond ◽  
James E. Saiers ◽  
William V. Sobczak ◽  
Na Xu
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
New England ◽  
Aquatic Ecosystems ◽  
Redox State ◽  
Headwater Stream ◽  
Four Component Model ◽  
Parallel Factor ◽  
Aquatic Sciences ◽  
Hillslope Processes

Understanding the processes controlling the transfer of organic matter from terrestrial to aquatic ecosystems is of fundamental importance for the aquatic sciences. Over the course of a full year, fluorescence, absorbance and bioavailability of dissolved organic matter (DOM) were characterised in Bigelow Brook, a forested headwater stream in Massachusetts, USA. Parallel factor analysis (PARAFAC) identified a four-component model to describe observed DOM fluorescence (C1–C4). Component C2 exhibited the characteristics of a more humic-like fluorophore, with a potentially more reduced redox state and increased with discharge, whereas more fulvic-like (C1) and protein-like (C3, C4) fluorophores decreased. Under both dark and light-exposed conditions, percentage bioavailable dissolved organic carbon (%BDOC) increased with discharge (R2 = 0.37 and R2 = 0.56). C2 and specific absorptivity (SUVA) were reduced following BDOC incubations, whereas C1, C3 and C4 increased. These changes to DOM characteristics with increasing discharge were observed under both baseflow and stormflow conditions, indicating that with rising watertable, loading from a large riparian or hyporheic pool of organic matter is likely occurring. Other headwater streams, where loading is controlled by hillslope processes, are likely to exhibit a similar pattern of increasing export of more humic and bioavailable DOM during hydrologic events.

Convergence of Terrestrial Dissolved Organic Matter Composition and the Role of Microbial Buffering in Aquatic Ecosystems

2019 ◽  
Vol 124 (10) ◽  
pp. 3125-3142 ◽  
Author(s):  
Jennifer L. Harfmann ◽  
François Guillemette ◽  
Karl Kaiser ◽  
Robert G. M. Spencer ◽  
Chia‐Ying Chuang ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Aquatic Ecosystems ◽  
Organic Matter Composition
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