GB 6730.27-1986 Methods for chemical analysis of iron ores--The lanthanum-alizarin complexon photometric method for the determination of fluorine content (English Version)
2017GB/T 6730.27-2017 Iron ores—Determination of fluorine content—Lanthanum-alizarin complexion spectrophotometric method
1986GB 6730.27-1986 Methods for chemical analysis of iron ores--The lanthanum-alizarin complexon photometric method for the determination of fluorine content