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Chronopotentiometric stripping method in the analysis of polymeric organic material in seawater

Polymeric organic material, mainly polysaccharides(PS), represents the main fraction of phytoplankton organic exudates. Organic material from seawater samples and from diatom culture Skeletonema costatum sample was electrochemically characterized. Emphasis was on the determination of N-containing polymeric organic material(N-PM) as well as surface active substances(SAS) and copper complexing capacity(CuCC). Concentration of N-PM was expressed with respect to model protein-human serum albumin(HSA) which plot is a straight line. HSA contains 15% of nitrogen. Chronopotentiometric stripping signal (called "peak H") is a result of a "presodium" catalysis of electroreduction of hydrogen ion. Nitrogen carries hydrogen ions from bulk solution to the surface of mercury drop where they get reduced to form hydrogen, and "peak H" appears. It is situated at a quite negative potential (Ep~-1.70 to -1.80 V). Sensitive and fast chronopotentiometric stripping method (CPS) can be usefully applied for quantitative determination and characterization of different types of organic polymeric material in seawater.

Chronopotentiometric stripping analysis; N-containing polymeric organic material; seawater

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