GB 6730.48-1986 Method for chemical analysis of iron ore-Dithiodiantipyridine methane spectrophotometric method for determination of bismuth content (English Version)
2021GB/T 6730.48-2021 Iron ores—Determination of bismuth content— Dithiodiantipyryl methane spectrophotometric method
1986GB 6730.48-1986 Method for chemical analysis of iron ore-Dithiodiantipyridine methane spectrophotometric method for determination of bismuth content