Humic Substances and the Surface Properties of Iron Oxides in Freshwaters
Adsorption by iron oxides in natural waters, sediments and soils is commonly studied in order to understand the biogeochemical behaviour of the adsorbing species, or adsorbate. Prominent examples of such adsorbates are inorganic phosphate (see e.g. Hingston et al. 1968; Ryden et al. 1977) silicate (Hingston et al. 1968; Mott 1970) and trace metals (see e.g. Jenne 1968; Gadde & Laitinen 1974; Forbes et al. 1976). Another reason for studying adsorption is to see how it affects the particulate material itself, by influencing the surface presented to the environment. It is this surface which decides rates and extents of physical association with other particles — and consequently settling rates, grain size etc. In addition, processes such as crystallization and dissolution, as well as catalytic properties, are surface dependent.
KeywordsIron Oxide Humic Substance Electrophoretic Mobility Shear Plane Iron Oxide Particle
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