Abstract
Natural particles in suspension in fresh, marine, and estuarine surface waters generally display a narrow range of negative electrophoretic mobilities. The measured mobilities are thought to be controlled by organic and oxide surface coatings, and there is considerable evidence for control by the organic coatings. Here we present results which indicate that oxide‐hydroxide coatings can control the mobility under conditions found in a river fed by acid‐mine drainage, but that organic coatings, when present, assume overall mobility control. Electrophoretic measurements show positively charged river particles acquiring less positive and then negative charges in estuarine waters. In the river and at low salinities mobility is affected by the pH of the water. At higher salinities the oxide‐hydroxide character is less evident, and particles assume the negative mobilities normally found in natural waters and attributed to organic surface coatings.
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