Photochemical Release of Dissolved Organic Nitrogen from Algal Detritus and Sediment Particles in Lake Taihu, China DOI Open Access
Yanan Liu, Xiaolong Yao

Water, Journal Year: 2023, Volume and Issue: 15(19), P. 3346 - 3346

Published: Sept. 24, 2023

Solar irradiation in aquatic systems can induce the conversion of substances from solid to dissolved phase (photodissolution). Yet, photochemical release organic nitrogen (DON) internal particles lakes remains largely unknown. In this study, suspensions algal detritus and sediment a shallow eutrophic lake were exposed simulated solar irradiation, compositional changes matter explored by measuring their UV–Visible absorption spectroscopy ultrahigh resolution Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS). The inorganic during incubations was also investigated. Results showed that light induced stronger carbon DON production suspensions, with rates 1.17 mg C L−1 h−1 0.14 N h−1, respectively, at an concentration 0.1 dry g L−1. Light both suspensions. A larger number molecules lower molecular weight continuously released e.g., total formulas increased 1349 4135 8 h irradiation. contrast, upon decreased diversity aromaticity. ammonium (photoammonification) higher rate 0.015 which may contribute eutrophication lake. This study provides new insights into typical lakes.

Language: Английский

Mechanisms of photochemical release of dissolved organic matter and iron from resuspended sediments DOI
Bin Hu, Peifang Wang,

Tianli Bao

et al.

Journal of Environmental Sciences, Journal Year: 2020, Volume and Issue: 104, P. 288 - 295

Published: Dec. 24, 2020

Language: Английский

Citations

11
A weak-light-responsive TiO2/g-C3N4 composite film: photocatalytic activity under low-intensity light irradiation DOI
Peifang Wang, Xiang Guo,

Lei Rao

et al.

Environmental Science and Pollution Research, Journal Year: 2018, Volume and Issue: 25(20), P. 20206 - 20216

Published: May 10, 2018

Language: Английский

Citations

11
Impact of Contrasted Weather Conditions on CDOM Absorption/Fluorescence and Biogeochemistry in the Eastern Lagoon of New Caledonia DOI Creative Commons
Cécile Dupouy, Rüdiger Röttgers, Marc Tedetti

et al.

Frontiers in Earth Science, Journal Year: 2020, Volume and Issue: 8

Published: March 20, 2020

New Caledonia (Southwest Pacific), like all tropical Pacific Island countries, is impacted by weather events, climate change, and local anthropogenic forcing. Strong erosion of particles dissolved organic matter (DOM) from ultramafic rocks, associated with trace metals dissemination (i.e., nickel, manganese cobalt), potentially affects lagoon waters coral reefs surrounding the main island. The CALIOPE (CALedonian Inherent Optical PropErties) cruises were performed along Eastern Lagoon (ELNC) (400 km, 13 transects Bay to open ocean, 51 stations) during contrasted meteorological conditions: a dry period (October 2011), windy situation (March 2014), strong rainy event 2016). CDOM absorption fluorescence (FDOM), particulate absorption, backscattering, suspended (SPM), total chlorophyll (TChla), nutrients (NOx), pigment phytoplankton composition measured. Among four fluorophores, humic-like component (λEx/λEm: 235/460 nm), assimilated photoproduct terrestrial matter, had relatively low compared protein-like fluorophores. As (TChla) nutrient (NOx) concentrations, this material generally showed highest values rainfall latter inducing an increase in riverine terrigeneous inputs change towards higher size classes. tyrosine 1-like 220, 275/304 nm) tryptophan-like fluorophores 230, 300/352 strongly influenced wind displaying 7-fold 3-fold increase, respectively calm conditions. These increases could be related enhancements autochthonous biological activities (highest mean concentrations Synechococcus spp., phycoerythrin, pico- nano-eukaryotes, heterotrophic bacteria nanoplankton observed condition) through mineral materials issued wind-induced sediment resuspension, atmospheric deposition water mass mixing. By contrast, 2-like fluorophore 245, substantially increased rain events presented lowest may linked stimulation planktonic due inputs. Therefore, study emphasizes significant differential influence conditions (calm/wind/rain) on biogeochemistry CDOM/FDOM distributions ELNC.

Language: Английский

Citations

10
Effects of titanium dioxide (TiO 2 ) nanoparticles on the photodissolution of particulate organic matter: Insights from fluorescence spectroscopy and environmental implications DOI
Bin Hu, Peifang Wang, Jun Hou

et al.

Environmental Pollution, Journal Year: 2017, Volume and Issue: 229, P. 19 - 28

Published: May 31, 2017

Language: Английский

Citations

8
Photochemical Release of Dissolved Organic Nitrogen from Algal Detritus and Sediment Particles in Lake Taihu, China DOI Open Access
Yanan Liu, Xiaolong Yao

Water, Journal Year: 2023, Volume and Issue: 15(19), P. 3346 - 3346

Published: Sept. 24, 2023

Solar irradiation in aquatic systems can induce the conversion of substances from solid to dissolved phase (photodissolution). Yet, photochemical release organic nitrogen (DON) internal particles lakes remains largely unknown. In this study, suspensions algal detritus and sediment a shallow eutrophic lake were exposed simulated solar irradiation, compositional changes matter explored by measuring their UV–Visible absorption spectroscopy ultrahigh resolution Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS). The inorganic during incubations was also investigated. Results showed that light induced stronger carbon DON production suspensions, with rates 1.17 mg C L−1 h−1 0.14 N h−1, respectively, at an concentration 0.1 dry g L−1. Light both suspensions. A larger number molecules lower molecular weight continuously released e.g., total formulas increased 1349 4135 8 h irradiation. contrast, upon decreased diversity aromaticity. ammonium (photoammonification) higher rate 0.015 which may contribute eutrophication lake. This study provides new insights into typical lakes.

Language: Английский

Citations

2