Mixed Acid System Research Articles

Spectrophotometric determination of silicon by a standard addition procedure

The pH ranges suitable for the development of yellow molybdosilicate in sulphuric, hydrochloric, nitric, and perchloric acids have been established, and the effect of sodium salts of these acids, fluoride-boric acid mixtures, zirconium-fluoride and titanium-fluoride system on the pH various acid media has been studied. A method is given for calculating the required minimum pH in mixed acid systems. Procedures are described for determining silicon in steels, aluminium, nickel-silicon, uranium-silicon, potassium hydrogen difluoride and titanium sponge by a standard addition procedure.