Abstract
The solubility of aluminum hydroxide in seawater of 35‰ salinity at pH = 7.4−8.2 and 25°C was determined experimentally for three samples synthesized in different ways. The solubilities of two phases subjected to ageing and precipitated (a) from a boiling solution of aluminum sulfate and (b) immediately from seawater at room temperature were a little different and showed the minimum within pH = 8.05−8.10. The solubility of aluminum hydroxide precipitated from a solution of sulfate aluminum at room temperature and not subjected to ageing was about twofold at pH∼7.9. The analysis of the pH dependence of the concentration of dissolved aluminum allows one to suppose that an Al(OH) 2 + hydroxo complex is the primary form of the aluminum occurrence in seawater at pH 8.10. Electrically neutral Al(OH) 3 0 hydroxocomplexes may be prevailing within the narrow range of pH = 8.05−8.10 and, in general, are of secondary importance.
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