Abstract
The adsorption of palmitic acid by calcite was determined as a function of palmitic acid concentration and salinity. Adsorption isotherms were generally of the S-type, indicating probable hydrophobic interaction of adsorbed species. The effect of increased salinity was to increase adsorption from 0–25 ppt, then to decrease adsorption from 25–35 parts per thousand. The adsorption increase results from decreased solubility, whereas the adsorption decrease may be related to micelle formation. Dissolved Mg 2+ was found to strongly inhibit fatty acid adsorption. Desorption of surface-bound phosphate was associated with palmitic acid adsorption. The relationship between adsorbed Mg 2+, phosphate and palmitic acid suggests investigation of adsorption behavior of natural phospholipid compounds.
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