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- W2052809618 abstract "Three-dimensional excitation–emission matrix (EEM) fluorescence with thermal quenching has been applied to raw and size-fractionated freshwaters. To size-fractionate organic matter, sequential filtration through mixed-ester-cellulose membrane filters with nominal pore size of 1.2, 0.1 and 0.025 μm were used. Humic-like fluorophores (peaks A and C) have been found to dominate EEMs of raw and all size fractions of studied waters. Peak A fluorescence intensity has been found to be more thermally sensitive than peak C fluorescence intensity. Humic-like fluorescence intensity was generally size independent, which indicated that it was present mainly in the smallest size fraction (<0.025 μm). This was confirmed by total organic carbon (TOC) measurements. Peak T (tryptophan-like) fluorescence, that is widely associated with biological activity, exhibited a greater thermal sensitivity of fluorescence intensity in the larger size fractions, demonstrating the presence of more than one fluorophore in different size fractions at this location in optical space. Thermal fluorescence quenching provides insights into organic matter variability and associated colloidal characteristics." @default.
- W2052809618 created "2016-06-24" @default.
- W2052809618 creator A5005344720 @default.
- W2052809618 creator A5008509235 @default.
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- W2052809618 date "2007-07-01" @default.
- W2052809618 modified "2023-10-10" @default.
- W2052809618 title "Characterisation of colloidal and particulate organic carbon in freshwaters by thermal fluorescence quenching" @default.
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- W2052809618 doi "https://doi.org/10.1016/j.watres.2007.04.017" @default.
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