Discussion
State whether the following is true or false.
Flocculation of clay particles is promoted by the salinity of estuarine water.
Answer: D
Correct answer: True
The dissolved ions in seawater compress the electrical double layer around each clay particle, reducing the repulsion that kept them dispersed, so collisions result in adhesion and flocs form. Even quite low salinities are enough. It is the reason fine sediment that travelled hundreds of kilometres in suspension settles within a few kilometres of the salt intrusion.
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