Excretion of Organic Matter during an Experimental Phytoplankton Bloom Followed Using o-Nitrophenol as an Electrochemical Probe

摘要

Extracellular excretion of the surface active organic matter during a nutrient enriched phytoplandton culture growth was studied us- ing 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 con- centratins of both polysaccharides and proteins, in dissolved and particulate phases.