engleski

Capacity of the Electrochemical Adhesion Sensor for Simultaneous Detection of Dissolved Molecules and Organic Particles in Seawater

Molecules adsorb and soft particles adhere at the mercury electrode/seawater interface. Adhesion of soft particles which results in electrical signals well-defined by duration in milliseconds and amplitude in microamperes (0.1-10 μ A) is affected by the presence of adsorbed organic molecules. This is the basic principle for simultaneous detection of dissolved and particulate organic matter in aquatic systems. Nonpolar and negatively charged dextrans were selected as models of dissolved polymers and marine nanoflagellate Dunaliella tertiolecta as model soft microparticle. The experiments were performed in 0.1 M NaCl and pH 8. The amplitude and frequency of adhesion signals decrease significantly both at positively and negatively charged electrode upon addition of nonpolar dextran to the cell suspension. In contrast, the presence of negatively charged dextran does not change the amplitude nor the frequency of adhesion signals at the negatively charged electrode. Results obtained from the experiments done on a model system show the capacity of the electrochemical adhesion sensor, here the static mercury drop electrode, for simultaneous detection and characterization of soft microparticles and polarity of dissolved molecules in seawater.

adsorption of biopolymers; cell adhesion; electrochemical adhesion sensor

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