This standard is applicable to biotite granite, rhyolite, granodiorite, quartz hornblend andesite, olivine basalt, gabbro, trachyandesite, nexia syenite, sandstone, shale and other silica with similar composition Determination of ferric oxide in salt rocks. Measuring range: Potassium dichromate volumetric method, greater than 5% ferric oxide. Sulfosalicylic acid photometric method, 0.05% to 15% ferric oxide. O-diazephenanthrene photometry, 0.01% to 5% ferric oxide. This standard complies with the provisions of GB/T14505.
GB/T 14506.5-1993 history
2010GB/T 14506.5-2010 Methods for chemical analysis of silicate rocks.Part 5:Determination of ferric oxide content