Colloidal hydrous ferric and manganese oxides

Hydrous ferric and manganese oxides are readily reduced and hence become 

Some of the consequences for lead speciation of mixing inland waters with sea water have already been noted. The results of Hem s study [27] (Section 3.4.2) suggest that lead would be released from ion exchange sites on sediments. Rohatgi and Chen [30] have indeed found a release of lead from sediments upon mixing with sea water (Table 3.14). However, their results showed that equilibrium was achieved only after 20 days, although a major part of the 

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