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Excretion of organic matter during an experimental phytoplankton bloom followed using o-nitrophenol as an electrochemical probe

Gašparović, Blaženka; Vojvodić, Vjeročka; Ćosović, Božena (1998) Excretion of organic matter during an experimental phytoplankton bloom followed using o-nitrophenol as an electrochemical probe. Croatica Chemica Acta, 71 (2). pp. 271-284. ISSN 0011-1643

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Abstract

Extracellular excretion of the surface active organic matter during a nutrient enriched phytoplankton culture growth was studied using o-nitrophenol (ONP) as an electrochemical probe. Changes in the hydrophilic and hydrophobic acid fractions, as compared to the unfractionated seawater sample, were followed during the twelve days of the experiment. Diatoms were the dominant phytoplankton species growing during the experiment. It was observed that the enrichment of natural seawater by nutrients caused increased concentrations of both polysaccharides and proteins, in dissolved and particulate phases. At the end of the experiment, polysaccharides were the dominant adsorbable organic matter on the mercury electrode according to the changes of the electrochemical characteristics of the ONP probe. The excreted polysaccharides were weakly acidic. Their estimated concentration was equivalent to 1.2 mg dm(-3) as neutral dextran T-500 or 3 mg dm(-3) as weakly acidic hyaluronic acid.

Item Type: Article
Uncontrolled Keywords: surface-active substances; marine-phytoplankton; seawater samples
Subjects: NATURAL SCIENCES > Chemistry
Divisions: Division for Marine and Enviromental Research
Projects:
Project titleProject leaderProject codeProject type
Priroda i reaktivnost organskih tvari u moru i kopnenim vodaBožena Ćosović00981503MZOS
Depositing User: Blaženka Gašparović
Date Deposited: 28 Nov 2013 09:31
Last Modified: 07 Mar 2014 09:34
URI: http://fulir.irb.hr/id/eprint/1157

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