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Sedimentary humic substances in the northern Adriatic sea (Mediterranean sea)

TitoloSedimentary humic substances in the northern Adriatic sea (Mediterranean sea)
Tipo di pubblicazioneArticolo su Rivista peer-reviewed
Anno di Pubblicazione2006
AutoriCalace, N., Cardellicchio N., Petronio B.M., Pietrantonio Massimiliana, and Pietroletti M.
RivistaMarine Environmental Research
Parole chiaveAdriatic Sea, Aliphatic carbon, article, Benzopyrans, carbon, Carboxylic acids, cluster analysis, concentration (parameters), Correlation analysis, Decomposition, Environmental monitoring, Eurasia, Europe, Fourier Transform Infrared, fresh water, fulvic acid, Geologic Sediments, Humic acid, humic substance, Humic substances, humification, Italy, Magnetic Resonance Spectroscopy, Mediterranean Sea, Nitrogen, nutrient, Organic carbon, organic compounds, organic matter, oxidation reduction potential, Oxidation-Reduction, Phosphorus, Po River, Redox reactions, River, Rivers, scoring system, sea, seashore, sediment, sediment analysis, Sediments, Southern Europe, Spectroscopy, statistics, Substitution reactions, thermogravimetry, Total organic carbon (TOC)

Humic compounds were determined in sediments collected in an area of the Adriatic sea receiving fresh waters from the river Po. Sediment cores (10 cm) were sectioned into four layers which were analysed separately for redox potential (Eh), total phosphorus (TP), total organic carbon (TOC), humic (HA) and fulvic acid (FA) content. The structure of HA and FA was also investigated. The results showed that the TOC and TP content decreased from the coast to the open-sea stations. Humic and fulvic acid concentrations were also inversely correlated to the distance from the coast. Moreover, the humic and fulvic acids were closely correlated to the total organic content and to the total phosphorus content. The correlations found between humic substances (HS) and TOC and TP, respectively, could be explained both by an in situ formation due to the high content of nutrients and organic matter, and by a common source of HS, TOC and TP, namely the River Po discharge. The predominant presence of aliphatic carbon in the humic structures, the low degree of substitution and the high nitrogen content suggest that primarily humified compounds were formed in situ. Nevertheless, the River Po can act both as supplier of organic matter of which decomposition products lead to the formation of humic compound and as carrier of humified compounds. © 2005 Elsevier Ltd. All rights reserved.


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Citation KeyCalace200640