GB/T 12690.11-2025 Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides—Part 11:Determination of magnesium content—Flame atomic absorption spectrometric method

GB/T 12690.11-2003 Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides—Determination of magnesium content—Flame atomic absorption spectrometric method

GB/T 6379.2-2004 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 6682-1992 Water for analytical laboratory use—Specification and test methods GB/T 6682-2008 Water for analytical laboratory use—Specification and test methods GB/T 8170-1987 Rules for rounding off of numberical values GB/T 8170-2008 Rules of rounding off for numerical values & expression and judgement of limiting values JJG 694-2009 Atomic Absorption Spectrophotometers JJG 694-1990 Verification Regulation for Atomic Absorption Spectrophotometer JJG 694-2025 Verification Regulation of Atomic Absorption Spectrophotometers