This document specifies the method for the determination of the total amount of rare earths by the oxalate gravimetric method. This document is applicable to the determination of the total amount of rare earths in natural iron ore, iron concentrate and lump ore, including sintered products. Measuring range (mass fraction): 1.00%~20.00%.
GB/T 6730.25-2021 Referenced Document
GB/T 10322.1 Iron ore sampling and sample preparation methods*, 2023-08-06 Update
GB/T 12690.12 Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides-Determination of thorium content-Arsenazo III spectrophotometric method and inductively coupled plasma mass spectrum method
GB/T 12808 Laboratory glass instrument single marked line pipette
GB/T 6379.1 Accuracy(trueness and precision)of measurement methods and results Part 1:General principles and definitions
GB/T 6379.2 Accuracy(trueness and precision)of measurement methods and results-Part 2:Basic method for the determination of repeatability and reproducibility of a standard measurement method
GB/T 6682 Water for analytical laboratory use.Specification and test methods
GB/T 6730.1 Iron ores.Preparation of predried test samples for chemical analysis
GB/T 8170 Rules of rounding off for numerical values & expression and judgement of limiting values
GB/T 6730.25-2021 history
2021GB/T 6730.25-2021 Iron ores—Determination of total rare earth contents—Oxalate gravimetric method
2006GB/T 6730.25-2006 Iron ores Determination of total rare earth contents Oxalate gravimetric method
1986GB/T 6730.25-1986 Methods for chemical analysis of iron ores--The gravimetric method for the determination of rare earth elements content