GB/T 3286.2-2025 Active

This document describes the determination of silica content using the silicomolybdenum blue spectrophotometry, perchloric acid dehydration gravimetry, and inductively coupled plasma emission spectrometry; and the determination of alumina content using the chromotropic S spectrophotometry, complexometric titration, and inductively coupled plasma emission spectrometry. This document is applicable to the determination of silica and alumina content in limestone, dolomite, and metallurgical lime. - Silicomolybdenum blue spectrophotometry: Determination range (mass fraction): 0.050% to 4.00% silica content. - Perchloric acid dehydration gravimetry: Determination range (mass fraction): silica content greater than 2.00%. - Inductively coupled plasma emission spectrometry: Determination range (mass fraction): 0.070% to 3.50% silica content. - Chromotropic S spectrophotometry: Determination range (mass fraction): 0.010% to 0.75% alumina content. - Complexometric titration: Determination range (mass fraction): alumina content greater than 0.50%. - Inductively coupled plasma emission spectrometry: Determination range (mass fraction): 0.040% to 1.00% alumina content.