This standard applies to the determination of the total amount of rare earths in iron ore, iron concentrate, sinter and pellets. Measuring range: below 1.000%.
GB/T 6730.24-1986 history
2006GB/T 6730.24-2006 Iron ores Determination of total rare earth contentd Chlorophosphonazo mA spectrophotometric method
1986GB/T 6730.24-1986 Methods for chemical analysis of iron ores--The arsenazo 3 photometric method for the determination of rare earth elements content