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|title: ||Fluorescence and DOC contents of estuarine pore waters from colonized and non-colonized sediments: Effects of sampling preservation|
|authors: ||OTERO, M|
Santos, Eduarda E.B.H.
Esteves, Valdemar I.
|keywords: ||Pore water|
|issue date: ||2007|
|abstract: ||The influence of the colonization of salt marsh sediments with Halimione portulacoides was evaluated by analysing the fluorescent
dissolved organic matter (FDOM) in sediment pore waters from a salt marsh at different depths. Cores of sediments at colonized and
non-colonized sites were collected from a coastal lagoon (Ria de Aveiro, Portugal). The DOC content of extracted pore waters was determined
and characterized by synchronous molecular fluorescence (Dk = 60 nm) and UV–visible spectroscopies. The common practice of
freezing sediment cores for further and later chemical investigation was shown not to be an appropriate methodology of sample preservation.
On the contrary, freezing of extracted and filtered pore water seemed not to affect either the DOC content or the fluorescence
properties of pore waters. Two types of fluorescent substances were found in the pore waters spectra; one corresponding to humic-like
substances and another one resembling proteins. However, major differences were found in the spectra of pore waters depending on both
depth and the presence/absence of vegetation colonization|
|publisher version/DOI: ||http://dx.doi.org/10.1016/j.chemosphere.2006.10.044|
|appears in collections||DQ - Artigos|
PT Mar - Artigos
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