Abstract
Differential Pulse Voltammetry was applied to measure the redox potential of the Cr6+/Cr3+ pair in alkali silicates. After it was carried out in the Na2O–SiO2 system, where Na2O activity had been previously measured and the basicity was defined in such terms, it was extended to the xNa2O(1−x)K2O 2SiO2 quasi-binary and M2O 2SiO2 (M=Li, Rb and Cs) systems. The redox significantly depends on the basicity and it seems promising that a basicity scale based on this redox potential may be applicable to alkali silicate melts in general.
