ALUMINIUM SOLUBILITY IN RAINWATER AND MOLTEN SNOW

R. Losno (1) , J.L. Colin (2) , N. Le Bris (3) , G Bergametti (2) , T. Jickells (4) , B Lim

1 IPGP - Institut de Physique du Globe de Paris
2 LISA (UMR_7583) - Laboratoire Interuniversitaire des Systèmes Atmosphériques
3 LECOB - Laboratoire d'Ecogéochimie des environnements benthiques
4 LGMAC - Laboratory for Global Marine and Atmospheric Chemistry [Norwich]

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.

Mots clés: solubility; aluminium; rainwater chemistry

Domaines: Planète et Univers [physics]; Océan, Atmosphère

R. Losno, J.L. Colin, N. Le Bris, G Bergametti, T. Jickells, et al.. ALUMINIUM SOLUBILITY IN RAINWATER AND MOLTEN SNOW. Journal of Atmospheric Chemistry, 1993, 17 (1), pp.29-43. ⟨10.1007/BF00699112⟩. ⟨hal-02327089⟩