Department of Earth Sciences, University of Bristol
Prof. D.M. Sherman
Lecture 11: Estuaries
Estuaries provide an essential habitat for wildlife but they are susceptible to pollution from rivers
and urban runoff.
The chemical processes at estuaries determine the fluxes of riverine species into the ocean.
At estuaries, river water (pH 4-7, salinity < 5 ppt) mixes with seawater (pH 8.3, salinity 35 ppt)
causing metals to sorb to FeOOH and colloidal FeOOH/organic complexes to flocculate and be incorporated
You should be able to outline:
the concepts conservative vs. non-conservative mixing
the concept of flocculation and how it affects the dissolved vs. suspended
concentrations of trace metals.