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|title: ||Study of the effect of pH, salinity and DOC on fluorescence of synthetic mixtures of freshwater and marine salts|
|authors: ||Esteves, Valdemar I.|
Santos, Eduarda B. H.
Duarte, Armando C.
|issue date: ||1999|
|publisher: ||Royal Society of Chemistry|
|abstract: ||In order to provide support for the discussion of the fate of organic matter in estuaries, a laboratory simulation was
performed by changing freshwater ionic strength, pH and organic matter content. The change in spectroscopic
characteristics caused by variations in salinity, pH and organic matter concentration in the filtered samples was
observed by UV-Vis and fluorescence spectroscopy. The increase in emission fluorescence intensity of dissolved
organic matter (DOM) due to increasing salinity (in the range 0 to 5 g l−1) is affected by the pH of the samples. The
emission fluorescence intensity at the three maxima observed in the fluorescence spectra, is linearly correlated with
dissolved organic carbon (DOC) concentration at several salinity values in the same sample. The increase in organic
matter concentration caused a shift in the emission peak wavelength at 410 nm for several salinity values.We
concluded that it is necessary to take into account the influence of salinity and pH on emission fluorescence of
dissolved organic matter if it is to be used as a tracer in estuarine or near shore areas.|
|publisher version/DOI: ||http://dx.doi.org/10.1039/A902529D|
|source: ||Journal of Environmental Monitoring|
|appears in collections||DQ - Artigos|
PT Mar - Artigos
Ria - Artigos
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