Results 211 to 220 of about 10,837 (254)
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The fluorescence of dissolved organic matter in seawater
Marine Chemistry, 1992A total of 28 vertical profiles of seawater fluorescence was measured in the Sargasso Sea, the Straits of Florida, the Southern California Borderlands, and the central Pacific Ocean. In all cases, surface seawater fluorescence was low as a result of photochemical bleaching which occurs on the timescale of hours.
Robert F Chen, Jeffrey L Bada
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Relating dissolved organic matter fluorescence and functional properties
Chemosphere, 2008The fluorescence excitation-emission matrix properties of 25 dissolved organic matter samples from three rivers and one lake are analysed. All sites are sampled in duplicate, and the 25 samples include ten taken from the lake site, and nine from one of the rivers, to cover variations in dissolved organic matter composition due to season and river flow.
Baker, A. +3 more
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Fluorescence of Dissolved Organic Matter as a Natural Tracer of Ground Water
Groundwater, 2001Abstract The fluorescence properties of dissolved organic matter (DOM) in ground water in the Permian limestone of northeast England is determined from six monitoring boreholes, a private water supply well and from a natural resurgence in a flooded collapse doline in the environs of Darlington, County Durham, northeast England ...
Baker A, Lamont-Black J
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Environmental Science & Technology, 2010
The fluorescent properties of dissolved organic matter (DOM) are often studied in order to infer DOM characteristics in aquatic environments, including source, quantity, composition, and behavior. While a potentially powerful technique, a single widely implemented standard method for correcting and presenting fluorescence measurements is lacking ...
Murphy, Kathleen R. +5 more
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The fluorescent properties of dissolved organic matter (DOM) are often studied in order to infer DOM characteristics in aquatic environments, including source, quantity, composition, and behavior. While a potentially powerful technique, a single widely implemented standard method for correcting and presenting fluorescence measurements is lacking ...
Murphy, Kathleen R. +5 more
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Fluorescent Dissolved Organic Matter in Natural Waters
2012Dissolved organic matter (DOM), of allochthonous and autochthonous origin, is a heterogeneous mixture of organic compounds, with molecular weights ranging from less than 100 to over 300,000 Da in natural waters. The DOM components are involved into key biogeochemical processes such as global carbon cycle, nutrient dynamics, photosynthesis, biological ...
Khan M. G. Mostofa +5 more
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Characterization of Dissolved Organic Matter with Intermittent Aeration by Fluorescence
Analytical Letters, 2016ABSTRACTThis work characterized the fluorescence of dissolved organic matter in water under intermittent aeration and the correlation between the fluorescence and ammonia concentration. The fluorescence spectra allowed determination of proteins using two excitation wavelengths for tyrosine and tryptophan.
Hua Zhang +4 more
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The fluorescence of dissolved organic matter in porewaters of marine sediments
Marine Chemistry, 1994Abstract The fluorescence of porewaters from marine sediment cores from six different areas was measured. In most cases, fluorescence was affected primarily by the diagenesis of organic carbon first through sulfate reduction and subsequently by methane generation.
Robert F. Chen, Jeffrey L. Bada
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Fluorescence of nanoparticles of organic matter dissolved in natural water
Moscow University Physics Bulletin, 2007The fluorescence of nanoparticles of dissolved organic matter under 270-, 310-, and 355-nm excitation is studied for different molecular fractions. The fluorescence quantum yield of the colloidal (molecules of size 5–200 nm) and low-molecular-weight (molecules smaller than 5 nm) fractions are obtained.
A. S. Milyukov +4 more
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Thermal fluorescence quenching properties of dissolved organic matter
Water Research, 2005The fluorescence excitation-emission matrices of dissolved organic matter (DOM) are investigated between 10 and 45 degrees C for river and waste waters and organic matter standards. With increased temperature, fluorescence intensity is quenched. It is demonstrated that for a range of river and wastewater samples, that tryptophan-like fluorescence ...
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Biological lability of streamwater fluorescent dissolved organic matter
Limnology and Oceanography, 2012We investigated the biological lability of fluorescent dissolved organic matter (FDOM) from a temperate Piedmont stream. Plug‐flow bioreactors, colonized and maintained with natural stream water, were used to determine the concentrations of stream‐water biodegradable dissolved organic carbon (BDOC) and relative concentrations of FDOM within ...
Rose M. Cory, Louis A. Kaplan
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