The relationship between dissolved organic matter and percolation water chemistry in northern Finland

1995 ◽  
Vol 79 (1-4) ◽  
pp. 191-200 ◽  
Author(s):  
Antti -Jussi Lindroos ◽  
John Derome ◽  
Kaarina Niska
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Water Chemistry ◽  
The Relationship ◽  
Percolation Water

scholarly journals Sedimentary supply of humic-like fluorescent dissolved organic matter and its implication for chemoautotrophic microbial activity in the Izu-Ogasawara Trench

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
M. Shigemitsu ◽  
T. Yokokawa ◽  
H. Uchida ◽  
S. Kawagucci ◽  
A. Murata
Keyword(s):  
Organic Matter ◽  
Community Structure ◽  
Dissolved Organic Matter ◽  
Oxygen Utilization ◽  
Fluorescent Dissolved Organic Matter ◽  
Vertical Distributions ◽  
The Difference ◽  
The Relationship ◽  
Apparent Oxygen Utilization

AbstractMicrobial community structure in the hadal water is reported to be different from that in the upper abyssal water. However, the mechanism governing the difference has not been fully understood. In this study, we investigate the vertical distributions of humic-like fluorescent dissolved organic matter (FDOMH), chemoautotrophic production, apparent oxygen utilization (AOU), and N* in the Izu-Ogasawara Trench. In the upper abyssal waters (< 6000 m), FDOMH has a significantly positive correlation with AOU; FDOMH deviates from the relationship and increases with depth without involving the increment of AOU in the hadal waters. This suggests that FDOMH is transferred from the sediments to the hadal waters through pore water, while the FDOMH is produced in situ in the upper abyssal waters. Chemoautotrophic production and N* increases and decreases with depth in the hadal waters, respectively. This corroborates the effluxes of dissolved substances, including dissolved organic matter and electron donors from sediments, which fuels the heterotrophic/chemoautotrophic microbial communities in the hadal waters. A simple box model analysis reveals that the funnel-like trench topography facilitates the increase in dissolved substances with depth in the hadal waters, which might contribute to the unique microbiological community structure in these waters.

Using diffusive gradients in thin films to probe the kinetics of metal interaction with algal exudates

2011 ◽  
Vol 8 (5) ◽  
pp. 517 ◽  
Author(s):  
Jacqueline Levy ◽  
Hao Zhang ◽  
William Davison ◽  
Rene Groben
Keyword(s):  
Thin Films ◽  
Organic Matter ◽  
Organic Carbon ◽  
Dissolved Organic Matter ◽  
Chlorella Vulgaris ◽  
Metal Speciation ◽  
The Relationship ◽  
Diffusive Gradients ◽  
Kinetics Of

Environmental context Interaction of metals with dissolved organic matter is one of the key processes defining metal bioavailability in water. The technique of diffusive gradients in thin films was used to investigate the kinetics of the interaction between metals and dissolved organic matter released by algae. For most metals the rate at which they were released from the organic matter was fast, but release of iron was kinetically limited. AbstractThe interaction of metals with organic matter is one of the key processes determining metal speciation and bioavailability in water. Fulvic acid tends to dominate dissolved organic carbon (DOC) in freshwaters, but organic carbon produced in situ, e.g. exudates released by algae and bacteria, is also significant. The technique of diffusive gradients in thin films (DGT) was used to investigate the lability of metal–exudate complexes using a kinetic signature approach. Exudates were harvested from three cultured freshwater alga (Chlorella vulgaris, Cryptomonas pyrenoidifera, Anabaena flos-aquae) and the filtered media supplemented with trace metals. DGT-labile metal concentrations and kinetic signatures were determined (24-h deployment). The relationship between Fe and DOC was a defining feature of the kinetic signatures. Iron was the most kinetically limited metal followed by Al and Cu, whereas Co, Ni and Pb were effectively completely labile. Exudates from Chlorella vulgaris produced the most DOC and the most marked kinetic limitation.

Regional variability in stream dissolved organic matter characteristics across forested regions of Canada, and its implications for drinking water treatability

2020 ◽  
Author(s):  
Julia Orlova ◽  
David Olefeldt ◽  
Fariba Amiri ◽  
Alyssa Bourgeois ◽  
Jim Buttle ◽  
...  
Keyword(s):  
Drinking Water ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Water Chemistry ◽  
Industrial Development ◽  
Headwater Streams ◽  
Drinking Water Treatment ◽  
System Stability ◽  
Spatial And Temporal Variability ◽  
Surface Water Chemistry

&lt;p&gt;Forested watersheds are a major source of drinking water for more than two thirds of Canadians. However, drinking water security is increasingly pressured by the combination of higher demands resulting from population growth and industrial development and climate change-exacerbated landscape disturbances (e.g., wildfires, hurricanes). These may lead to deteriorated, more variable source water quality that can challenge treatment operations beyond their response capacities and have the potential to cause service disruptions. The character and concentration of dissolved organic matter (DOM), as well their shifts in response to seasonal and event-based changes in streamflow, make DOM a key driver of drinking water treatment infrastructure needs and operational challenges. As part of the &lt;em&gt;for&lt;/em&gt;Water NSERC Network, which seeks to evaluate the impacts of pre-emptive forest management approaches on drinking water treatability in Canada, the objective of this study is to characterize differences in DOM concentrations and composition in headwater streams in different forested regions, including both undisturbed and disturbed catchments, and to evaluate the implications for drinking water treatability.&lt;/p&gt;&lt;p&gt;Our pan-Canadian study was conducted using existing long-term research sites, which span an area from 48.5&amp;#176; to 63&amp;#176; N between Canada&amp;#8217;s east and west coasts, and represent six major forested ecozones. These ecozones exhibit significant differences in soils, vegetation, hydrological systems, and consequently surface water chemistry. At each research site, 2 to 6 headwater streams were sampled several times in 2019 and 2020 to characterize seasonal and spatial variations in water chemistry. Where relevant, both disturbed (harvested or burned) and undisturbed catchments were sampled.&lt;/p&gt;&lt;p&gt;The spatial and temporal variability in DOM characteristics, including the effects of disturbances, were evaluated, and the links between DOM characteristics and drinking water treatability were explored. Distinct regional differences in the concentrations of major ions, dissolved organic carbon and nutrients were observed. Variations in DOM composition, as assessed through UV-vis absorbance and excitation-emission matrix (EEM) fluorescence spectroscopy, Fourier-transform ion cyclotron mass spectrometry (FT-ICR-MS), and asymmetric flow field-flow fractionation (AF4), were also detected. To characterize drinking water treatability, relative implications to coagulant demand, membrane fouling, and distribution system stability were evaluated. The true disinfection by-product formation potential for trihalomethanes and haloacetic acids after complete oxidation resulting from chlorination was also assessed. Collectively, the results of this study underscore the importance of better understanding and anticipating natural variations in stream DOM as well as the impacts of landscape disturbance to ensure the uninterrupted supply of safe drinking water.&lt;/p&gt;

Dissolved organic matter dynamics in Mediterranean lagoons: The relationship between DOC and CDOM

2018 ◽  
Vol 202 ◽  
pp. 37-48 ◽  
Author(s):  
A. Specchiulli ◽  
L. Cilenti ◽  
R. D'Adamo ◽  
A. Fabbrocini ◽  
W. Guo ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Mediterranean Lagoons ◽  
Organic Matter Dynamics ◽  
The Relationship

scholarly journals ANALISIS HUBUNGAN TOTAL BAKTERI, BAHAN ORGANIK TERLARUT, NITRAT DAN FOSFAT DI PERAIRAN MOROSARI, DEMAK

2018 ◽  
Vol 7 (4) ◽  
pp. 379-386
Author(s):  
Rijal Galih Amta Nursubekhi ◽  
Niniek Widyorini ◽  
Oktavianto Eko Jati
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Sampling Technique ◽  
Nutrient Content ◽  
Survey Method ◽  
Purposive Sampling ◽  
Fishing Boat ◽  
Dissolved Organic Matters ◽  
Boat Traffic ◽  
The Relationship

Perairan Morosari terletak di wilayah Kabupaten Demak. Perairan ini telah banyak dimanfaatkan masyarakat sekitar untuk berbagai macam aktivitas seperti pembuangan limbah domestik maupun industri, jalur lalu lintas perahu nelayan, kawasan wisata dan kegiatan perikanan baik budidaya maupun tangkap. Limbah yang dibuang langsung ke perairan ini diperkirakan telah menyebabkan terjadinya peningkatan kandungan nutrien, seperti bahan organik, nitrat dan fosfat di perairan Morosari, Demak. Tujuan dari penelitian ini adalah untuk mengetahui kelimpahan total bakteri, bahan organik terlarut, nitrat, dan fosfat di Perairan Morosari, Demak. serta mengetahui hubungan antara total bakteri dengan bahan organik terlarut, nitrat dan fosfat di Perairan Morosari, Demak. Penelitian ini dilaksanakan pada bulan Mei 2018. Metode yang digunakan dalam penelitian ini adalah metode survei dan teknik pengambilan sampel menggunakan metode purposive sampling yang dilakukan pada lima stasiun. Hasil penelitian menunjukkan nilai total bakteri berkisar <1x101 – 3,6x1011 CFU/ml, bahan organik terlarut 12,77 – 33,81 mg/l, nitrat 4,43 – 7,97 mg/l, fosfat 0,099 - 2,112 mg/l. Morosari Waters is located in Demak Regency. This waters have been widely used by the surrounding community for various activities such as the disposal of domestic and industrial waste, fishing boat traffic lanes, tourist areas and fishing activities both aquaculture and capture. Waste that directly enters  the water is thought to have caused an increase in nutrient content, such as organic matter, nitrate and phosphate in the waters of Morosari, Demak. The purpose of this study was to determine the total abundance of bacteria, dissolved organic matters, nitrate and phosphate in waters of Morosari, Demak. and knowing the relationship between total bacteria and dissolved organic matter, nitrate and phosphate in waters of Morosari, Demak. This research was carried out in May 2018. The method used in this research was survey method and the sampling technique used was purposive sampling method which was carried out at five stations. The results showed the total value of bacteria ranged from <1 x 101 – 3.6 x 1011 CFU / ml, dissolved organic matter 12.77 – 33.81 mg / l, nitrate 4.43 – 7.97 mg / l, phosphate 0.099 – 2,112 mg / l.

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