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Adhesion signals of organic particles on mercury electrodes

The research of the occurrence of adhesion signals at mercury electrodes of constant surface area has been carried out in this work in the purpose of developing an electrochemical particle counter. Cell suspensions of marine phytoplankton Dunaliella tertiolecta in 0.1 M NaCl aquatic solution are used as a monodispersed system model (particle diameter 6-10 micrometers, cell density in the range of 1.19 × 10^6 to 1.19 × 10^8/L). Well-resolved signals in chronoamperometric curves of dissolved oxygen are the result of the cell attachment to the mercury electrode surface. The calibration curve presents dependence of attachment frequency on the cell density in the concentration range 1.19 × 10^6 to 1.19 × 10^8 particles/L. Frequency of attachment signals is proportional to the surface area of mercury drop at constant cell density.

adhesion signals; organic particles; mercury electrodes

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