Abstract
A method of analysis of alkaline descaling solution containing sodium hydroxyd, sodium cyanide and “Chelate compound” was developed.
A satisfactory result was obtained by titrating EDTA with Ca++ using NN as indicator, calculating sodium cyanide by Liebig method and titrating sodium hydroxyde with an acid using indigo-carmine as indicator.
Consumption of sodium cyanide of descaling solution in action is considerably great, amount of sodium hydroxyde is apt to increase, but the EDTA remains constant.
Effect of descaling, consumption of sodium cyanide and increase of sodium hydroxyde vary depending upon the wave types of the current.
