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http://hdl.handle.net/10773/6829
Título: | Fluorescence and DOC contents of estuarine pore waters from colonized and non-colonized sediments: Effects of sampling preservation |
Autor: | OTERO, M MENDONCA, A VALEGA, M Santos, Eduarda E.B.H. Pereira, Eduarda Esteves, Valdemar I. Duarte, Armando |
Palavras-chave: | Pore water Fluorescence spectroscopy Organic matter Humic substances Sediment freezing |
Data: | 2007 |
Editora: | Elsevier |
Resumo: | 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 |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/6829 |
DOI: | 10.1016/j.chemosphere.2006.10.044 |
ISSN: | 0045-6535 |
Aparece nas coleções: | DQ - Artigos PT Mar - Artigos |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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Fluorescence_DOC_Pore Waters_2007.pdf | 220.85 kB | Adobe PDF |
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