ALUMINIUM SOLUBILITY IN RAINWATER AND MOLTEN SNOW
Résumé
Large variations of aluminium solubilities are found in marine and rural precipitations. The results of seven field experiments are used to produce a model of the solubilization of aluminium independent of the sampling site. Large variations of solubility appear, and the pH seems to be a major factor explaining this solubility changes. Thermodynamic calculations at T= 278K suggest that, at higher pHs (>5), equilibrium with gibbsite (ctAl(OI03) or a trivatent alkaline insoluble form acts as a limiting of aluminium solubility and at lower pHs (<5), AI could be in equilibrium with a hydroxysulfate salt Al(OH) l.5(SO4)0.75.