Silicate species in solution. Part 1. Experimental observations
作者:Lesley S. Dent Glasser、Eric E. Lachowski
DOI:10.1039/dt9800000393
日期:——
Changes in the pH or concentration of sodium silicatesolutions produce changes in the degree of polymerisation of the silicatespecies, and these have been followed by the technique of trimethylsilylation. Provided that the pH remains relatively high, above ca. 10 or 11 according to concentration, equilibrium is rapidly re-established after such changes. At lower pH, equilibrium is approached more
Polymerization of silicic acid adsorbed on iron (III) hydroxide from dilute monosilicicacid solutions in the concentration range 5–40ppm (SiO2) was studied over the pH range 6–12. Silicic acid species formed on the hydroxide were trimethylsilylated and trimethylsilyl derivatives were detected by gas chromatography. Monosilicicacid adsorbed polymerized, and dimer (Si2O76−), linear trimer (Si2O108−)