You are here: Home :: Area NEM :: Chemistry :: Physical chemistry

B. Lothenbach, Michael Ochs, D. Hager

Thermodynamic data for the solubility of tin(IV) in aqueous cementitious environments

The solubility of Sn(IV) in cementitious systems is directly related to the presence of dissolved Ca. In the presence of typical Ca concentrations, solid Ca[Sn(OH)₆](s) is precipitated, resulting in dissolved tin(IV) concentrations that are about four to six orders of magnitude lower than observed in alkaline, Ca-free systems. From different experiments carried out in initially oversaturated and undersaturated solutions, solubility products have been evaluated.
A constant of 10^9.85 at I=0 has been derived for the formation of fresh Ca[Sn(OH)₆](precip) according to the reaction Ca²⁺+{Sn(OH)₆^2- ↔ Ca[Sn(OH)₆](s). A constant of 10^10.93 has been derived in undersaturation experiments for the equilibrium with crystalline Ca[Sn(OH)₆](cr).

Radiochimica Acta, Oldenbourg Wissenschaftsverlag

Print ISSN: 0033-8230
Volume: 88, 09/2000
Pages: 521

Journal homepage (external site)

Show all available items of this journal

 

Area NEM