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 Fluorescence and DOC contents of estuarine pore waters from colonized and non-colonized sediments: Effects of sampling preservation
Please use this identifier to cite or link to this item http://hdl.handle.net/10773/6829

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.
Pereira, Eduarda
Esteves, Valdemar I.
Duarte, Armando
keywords: Pore water
Fluorescence spectroscopy
Organic matter
Humic substances
Sediment freezing
issue date: 2007
publisher: Elsevier
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
URI: http://hdl.handle.net/10773/6829
ISSN: 0045-6535
publisher version/DOI: http://dx.doi.org/10.1016/j.chemosphere.2006.10.044
source: Chemosphere
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PT Mar - Artigos

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