Abstract
Radiotracer experiments are described in which the effects of (i) suspended sediment particles and, (ii) changes in salinity, on the precipitation of iron in sea water are studied. It is shown that both increasing salinity and the presence of suspended particles increase the rate and extent of iron precipitation in sea water. Electrophoretic measurements made during the experiments showed that the surface charge on sediment particles becomes less negative during the hydrolysis and precipitation of iron. This is interpreted as a result of the sediment particles acting as negative nuclei for the aggregation of iron hydrolysis products. The geochemical consequences of the precipitation of iron in estuarine environments are considered in terms of the experimental results.
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