Über die Anwendung der Farbstoffadsorptionsmethode zur Charakterisierung von Natriumsilicat‐(Wasserglas‐)lösungen

Investigations of the influence of sodium silicate solutions on the dye spectrum of pinacyanol chloride showed a depending of the spectrum on the average condensation degree of the silicate anions, the concentration of impurities and the thermal treatment of silicate solutions. Water glass solutions characterized by similar molar Na: Si ratio (0.59-O.G1), SiO, concentration (5.9- 6.3 M), and average condensation degree show in dependence on impurities, temperature, and time of thermal treatment of the solutions different dye spectra, which hint at different structures and properties, respectively, of the water glass solutions. Solutions with a low content of impurities attain an equilibrium state even after a short thermal treatment (0.75 h; 16OOC). Those of a larger content of impurities need for an eqilibrium, different from the former one, a thermal treatment of several hours. The pinacyanol chloride adsorption method renders a distinction of sodium water glass solution considered for as long as identical.