Seawater's organic polymers – how to behave on mercury drop?

Strmečki Kos, Slađana Seawater's organic polymers – how to behave on mercury drop?. In: Znanstveni susreti 3. vrste (7 July 2011 - 8 July 2011) Zagreb, Hrvatska. (Unpublished)

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Abstract

Polymeric organic material, mainly composed from polysaccharides (PS), represents the main fraction of phytoplankton exudates. Catalytic properties and surface activity of polymeric organic material were analyzed by constant current chronopotentiometric stripping analysis (CPSA) and alternating current (AC) voltammetry. CPSA proved to be a suitable method for determination of low concentrations of nitrogen containing polymeric organic material (N-POM) in seawater by measuring its presodium catalytic “peak H”, which is due to the catalytic hydrogen evolution on mercury drop. The concentration of N-POM in seawater samples was expressed as equivalents of a model protein HSA (15% of N) for which a calibration line has been done. The concentrations of N-POM as well as SAS in seawater samples were variable through the seasons. Electrochemically inactive molecules of PS, if carrying sulphated groups (e.g. ι-carrageenan) produce in buffered solutions also well-developed chronopotentiometric peak HPS due to catalytic hydrogen evolution at mercury drop electrode. Here neither N nor –SH groups are expected, thus sulphate residues appear as a new type of groups responsible for the electrocatalysis. Nanomolar concentrations of i-carrageenan can be determined at moderate accumulation times.

Item Type:	Unpublished conference/workshop items or lecture materials
Uncontrolled Keywords:	Polymeric organic material; phytoplankton exudates; mercury;
Subjects:	NATURAL SCIENCES > Interdisciplinary Natural Sciences > Marine Science NATURAL SCIENCES > Interdisciplinary Natural Sciences > Environmental Science
Divisions:	Division for Marine and Enviromental Research
Depositing User:	Slađana Strmečki Kos
Date Deposited:	25 Sep 2012 11:44
URI:	http://fulir.irb.hr/id/eprint/364

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