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 Chromium Determination in Salt Rocks. Measuring range: diphenylcarbazide photometric method, 10-2000μg/g chromium. Ammonium hydroxide-ammonium chloride-α, α' bipyridine-sodium nitrite sodium sulfite bottom liquid polarography, 10~150μg/g chromium. This standard complies with the provisions of GB/T14505.
GB/T 14506.23-1993 history
2010GB/T 14506.23-2010 Methods for chemical analysis of silicate rocks.Part 23:Determination of chromium content