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- Publisher
- CSIRO Publishing
- Copyright
- Copyright © The Author(s). Published by CSIRO Publishing
- ISSN
- 1448-2517
- eISSN
- 1449-8979
- DOI
- 10.1071/EN13122
- Publisher site
- See Article on Publisher Site
Abstract
Environmental contextWe determined seasonal changes in the organic matter content of the northern Adriatic with newly applied electrochemical techniques able to measure catalytically active organics. The inflow of the Po River and its nutrient load are responsible for the observed changes in the type and concentrations of organic matter in the area.AbstractCatalytically active polysaccharides (Cat PSs) and nitrogen-containing polymeric organic material (N-POM) were determined in seawater from the northern Adriatic station ST101. Catalytically active organics were measured by applying electrochemical methods of adsorptive transfer chronopotentiometric stripping with medium exchange and chronopotentiometric stripping in unmodified seawater. Their concentrations were expressed in milligrams per cubic decimetre of equivalents of the model calibrating substances, polysaccharide xanthan and protein human serum albumin. The optimal electroanalytical conditions for determination of Cat PSs in seawater were evaluated and defined. Seasonal changes of Cat PSs and N-POM were observed during the period 20112013. The highest values were determined in the springsummer period and the lowest in winter. Cat PSs and N-POM were present in both the dissolved and particulate organic carbon fractions. Cat PSs and N-POM showed a statistically significant positive correlation with the concentrations of surface-active substances. A weak but statistically significant correlation was found between Cat PSs and dissolved organic carbon concentrations. Copper complexing capacities in the period 20112013 were in the range of 41130nmoldm3.
Journal
Environmental Chemistry – CSIRO Publishing
Published: Mar 25, 2014