The structure and origin of dissolved organic matter studied by UV-vis spectroscopy and fluorescence spectroscopy in lake in arid and semi-arid region

2011 ◽  
Vol 63 (5) ◽  
pp. 1010-1017 ◽  
Author(s):  
Guo Xu-jing ◽  
Xi Bei-dou ◽  
Yu Hui-bin ◽  
Ma Wen-chao ◽  
He Xiao-song
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Water Samples ◽  
Industrial Wastewater ◽  
Reclaimed Water ◽  
Domestic Sewage ◽  
Aromatic Structure ◽  
Vis Spectroscopy ◽  
Humification Degree ◽  
Semi Arid Region

To develop a proper indicator which could predict water quality and trace pollution sources is critically important for the management of sustainable aquatic ecosystem. In our study, seven water samples collected from Wuliangsuhai Lake in Inner Mongolia were used. UV-visible spectra and synchronous fluorescence spectra were applied to investigate the humification degree and aromatic structure of dissolved organic matter (DOM) extracted from water samples. The results showed that both samples from W1 site and W3 site display lower humification degree and less aromatic structure, where industrial wastewater and domestic sewage, and reclaimed water of farmland irrigation, were accepted respectively. After computing the values of SUVA254, A280, A250/365, A253/203 and A226–400, we reached the conclusion that they have a consistent trend (W4> W6> W5> W2> W7> W1> W3). Fluorescence index (f450/500) was always utilised to interpret the origin of organic matter in a complex aquatic environment system. Values of f450/500 are closer to 1.60, indicating that humic substances derived from terrestrial sources and biological sources. Our study demonstrated that reclaimed water of farmland irrigation, industrial wastewater and domestic sewage will definitely influence the humification degree and amount of the aromatic structure of DOM.

Sunlight-induced changes in naturally stored reclaimed water: Dissolved organic matter, micropollutant, and ecotoxicity

2021 ◽  
Vol 753 ◽  
pp. 141768
Author(s):  
Yongkun K. Wang ◽  
Xiaoyan Y. Ma ◽  
Shiying Zhang ◽  
Lei Tang ◽  
Hengfeng Zhang ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Reclaimed Water ◽  
Induced Changes

Removal of fluorescence and ultraviolet absorbance of dissolved organic matter in reclaimed water by solar light

2016 ◽  
Vol 43 ◽  
pp. 118-127 ◽  
Author(s):  
Qianyuan Wu ◽  
Chao Li ◽  
Wenlong Wang ◽  
Tao He ◽  
Hongying Hu ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Reclaimed Water ◽  
Solar Light ◽  
Ultraviolet Absorbance

scholarly journals Fast-freezing with liquid nitrogen preserves bulk dissolved organic matter concentrations, but not its composition

2016 ◽  
Author(s):  
Lisa Thieme ◽  
Daniel Graeber ◽  
Martin Kaupenjohann ◽  
Jan Siemens
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Liquid Nitrogen ◽  
Water Samples ◽  
Terrestrial Ecosystems ◽  
Spectroscopic Properties ◽  
Fluorescence Excitation ◽  
Total Fluorescence ◽  
Fluorescence Excitation Emission Matrices ◽  
Fast Freezing

Abstract. Freezing can affect concentrations and spectroscopic properties of dissolved organic matter (DOM) in water samples. Nevertheless, water samples are regularly frozen for sample preservation. In this study we tested the effect of different freezing methods (standard freezing at −18 °C and fast-freezing with liquid nitrogen) on DOM concentrations measured as organic carbon (DOC) concentrations and on spectroscopic properties of DOM from different terrestrial ecosystems (forest and grassland). Fresh and differently frozen throughfall, stemflow and soil solution samples were analyzed for DOC concentrations, UV-vis absorption and fluorescence excitation-emission matrices combined with parallel factor analysis (PARAFAC). Fast-freezing with liquid nitrogen prevented a significant decrease of DOC concentrations observed after freezing at −18 °C. Nonetheless, the share of PARAFAC components 1 (EXmax < 250 nm (340 nm), EMmax: 480 nm) and 2 (EXmax: 335 nm, EMmax: 408 nm) to total fluorescence and the humification index (HIX) decreased after both freezing treatments, while the shares of component 3 (EXmax: < 250 nm (305 nm), EMmax: 438 nm) as well as SUVA254 increased. The contribution of PARAFAC component 4 (EXmax: 280 nm, EMmax: 328 nm) to total fluorescence was not affected by freezing. We recommend fast-freezing with liquid nitrogen for preservation of bulk DOC concentrations of samples from terrestrial sources, whereas immediate measuring is preferable to preserve spectroscopic properties of DOM.

scholarly journals Spatial and seasonal variations in the composition of dissolved organic matter in a tropical catchment: the Lower Kinabatangan River, Sabah, Malaysia

2016 ◽  
Vol 18 (1) ◽  
pp. 137-150 ◽  
Author(s):  
Sahana Harun ◽  
Andy Baker ◽  
Chris Bradley ◽  
Gilles Pinay
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Seasonal Variations ◽  
Water Samples ◽  
River Catchment ◽  
Lower Kinabatangan

Dissolved organic matter (DOM) was characterised in water samples sampled in the Lower Kinabatangan River Catchment, Sabah, Malaysia between October 2009 and May 2010.

scholarly journals Fast-freezing with liquid nitrogen preserves bulk dissolved organic matter concentrations, but not its composition

2016 ◽  
Vol 13 (16) ◽  
pp. 4697-4705 ◽  
Author(s):  
Lisa Thieme ◽  
Daniel Graeber ◽  
Martin Kaupenjohann ◽  
Jan Siemens
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Liquid Nitrogen ◽  
Water Samples ◽  
Terrestrial Ecosystems ◽  
Spectroscopic Properties ◽  
Fluorescence Excitation ◽  
Total Fluorescence ◽  
Litter Leachate ◽  
Fast Freezing

Abstract. Freezing can affect concentrations and spectroscopic properties of dissolved organic matter (DOM) in water samples. Nevertheless, water samples are regularly frozen for sample preservation. In this study we tested the effect of different freezing methods (standard freezing at −18 °C and fast-freezing with liquid nitrogen) on DOM concentrations measured as organic carbon (DOC) concentrations and on spectroscopic properties of DOM from different terrestrial ecosystems (forest and grassland). Fresh and differently frozen throughfall, stemflow, litter leachate and soil solution samples were analyzed for DOC concentrations, UV-vis absorption and fluorescence excitation–emission matrices combined with parallel factor analysis (PARAFAC). Fast-freezing with liquid nitrogen prevented a significant decrease of DOC concentrations observed after freezing at −18 °C. Nonetheless, the share of PARAFAC components 1 (EXmax < 250 nm (340 nm), EXmax: 480 nm) and 2 (EXmax: 335 nm, EXmax: 408 nm) to total fluorescence and the humification index (HIX) decreased after both freezing treatments, while the shares of component 3 (EXmax: < 250 nm (305 nm), EXmax: 438 nm) as well as SUVA254 increased. The contribution of PARAFAC component 4 (EXmax: 280 nm, EXmax: 328 nm) to total fluorescence was not affected by freezing. We recommend fast-freezing with liquid nitrogen for preservation of bulk DOC concentrations of samples from terrestrial sources, whereas immediate measuring is preferable to preserve spectroscopic properties of DOM.

scholarly journals Fluorescence analysis allows to predict the oxidative capacity of humic quinones in dissolved organic matter: implication for pollutant degradation

2020 ◽  
Author(s):  
Davide Palma ◽  
Edith Parlanti ◽  
Mahaut Sourzac ◽  
Olivier Voldoire ◽  
Aude Beauger ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Water Samples ◽  
Three Dimensional ◽  
Complex Mixture ◽  
Fluorescence Analysis ◽  
Oxidative Capacity ◽  
Reactive Species ◽  
Solar Light ◽  
Pollutant Degradation

AbstractDissolved organic matter (DOM) controls the degradation and sequestration of aquatic pollutants and, in turn, water quality. In particular, pollutant degradation is performed by oxidant species that are generated by exposure of DOM to solar light, yet, since DOM is a very complex mixture of poorly known substances, the relationships between potential oxidant precursors in DOM and their oxydative capacity is poorly known. Here, we hypothesized that production of oxidant species could be predicted using fluorescence analysis. We analysed water samples from an alluvial plain by fluorescence spectroscopy; the three-dimensional spectra were then decomposed into seven individual components using a multi-way algorithm. Components include a protein-like fluorophore, e.g. tryptophan-like and tyrosine-like, three humic fluorophores, 2-naphthoxyacetic acid, and a by-product. We compared component levels with the ability of water samples to generate reactive species under solar light. The results show a strong correlation between reactive species production and the intensity of two humic-like fluorophores assigned to reduced quinones. Monitoring these fluorophores should thus allow to predict the ability of DOM degradation of pollutants in surface waters.

Molecular characterization of dissolved organic matter in various urban water resources using Orbitrap Fourier transform mass spectrometry

2014 ◽  
Vol 14 (4) ◽  
pp. 547-553 ◽  
Author(s):  
M. Urai ◽  
I. Kasuga ◽  
F. Kurisu ◽  
H. Furumai
Keyword(s):  
Mass Spectrometry ◽  
Organic Matter ◽  
Fourier Transform ◽  
Water Resources ◽  
Dissolved Organic Matter ◽  
River Water ◽  
Fourier Transform Mass Spectrometry ◽  
Reclaimed Water ◽  
Urban Water

Molecular-level characterization of dissolved organic matter (DOM) in different urban water resources (river water, groundwater, reclaimed water, and rainwater) was performed by Orbitrap Fourier transform mass spectrometry (FT-MS). The mass spectra, which were fingerprints of DOM composition, were clearly different among samples. Based on accurate molecular mass determination, about 300 molecular formulae were identified. Most of the DOM molecules were composed of carbon, hydrogen and oxygen. Molecular formulae in river water consisted of CHO mostly and much less N- and S-containing compounds than other water samples. The percentage of CHO molecules was the highest for reclaimed water. The reclaimed water sample was characterized by a few peaks with strong intensities, which were presumed to be linear alkylbenzene sulfonates, their co-products and their biodegradation products based on their molecular formulae. Some of these compounds were also detected from river water, probably indicating the impact of wastewater treatment plants located upstream of the sampling point. Orbitrap FT-MS analysis is a powerful tool to discriminate DOM composition of urban water resources.

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