Abstract
The effects of salinity and dissolved organic matter upon the surface charge characteristics of selected phytoplankton were investigated by means of microelectrophoresis. Nannochloris oculata Droop, Monochrysis lutheri Droop, and Cyclotella meneghiniana Kutzing, were negatively charged in diluted sea water. The magnitude of the electrophoretic mobility (EPM) of two of the phytoplankton species decreased as the salinity of the medium increased. Heat killing influenced the EPMs of the three phytoplankton species, suggesting the possibility that the surface charge of these phytoplankton organisms is influenced by surface biological processes. The EPM of C. meneghiniana decreased when the dissolved organic content of the medium was greater than 0.3 mg/1. Dissolved humic acids also inhibited the rate and magnitude of mercury sorption by C. meneghiniana.
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