Dilatometric study of the adsorption of heavy-metal cations on goethite.

摘要: The specific volumes of adsorption Cd, Co, Cu, Ni, Pb, and Zn on goethite determined by means the dilatometric method are 21, 32, 31, 42 cm3/mol, respectively, independent pH. effect NaCl (up to 0.5 mol dm-3) volume is rather insignificant. precipitation corresponding hydroxides (determined experimentally calculated) about 60 cm3/mol. Apparently, adsorbed heavy-metal cations lose half their hydration water. constant decreases as pressure increases, becomes significant at pressures >107 Pa, i.e., more than 1 km water column.