A gravimetric method for the determination of silica
JSGT 1959 V43 T059-T061
A rapid method for the gravimetric determination of silica in simple aluminosilicates has found widespread use in the ceramic industries. The sample is fused in sodium hydroxide and dissolved in hydrochloric acid. Ammonium molybdate is added to an aliquot to form silico-molybdic acid, which is then precipitated as quinoline silico-molybdate. This precipitate is then filtered off, dried, and weighed. The accuracy of the method is about +0·0%, −0·5% SiO2, and the precision about ±0·25%. Borate and fluoride do not interfere.
H. Bennett
