GB/T 6730.90-2025 Iron ores—Determination of gold,silver,platinum,palladium contents—Inductively coupled plasma mass spectrometry method

GB/T 6730.11-2025 Iron ores—Determination of aluminium content—EDTA titrimetric method GB/T 6730.13-2025 Iron ores—Determination of calcium and magnesium content—EGTA-CyDTA titrimetric method GB/T 6730.23-2025 Iron ores—Determination of titanium content—The ferric ammonium sulfate titrimetric method GB/T 6730.24-2025 Iron ores—Determination of total rare earth contents—Arsenazo Ⅲ spectrophotometric method GB/T 6730.45-2025 Iron ores—Determination of arsenic content—Arseno-molybdenum blue spectrophotometric method after hydrogen arsenide separation GB/T 6730.46-2025 Iron ores—Determination of arsenic content—Arseno-molybdenum blue spectrophotometric method after the distillation separation

GB/T 602-2002 Chemical reagent—Preparations of standard solutions for impurity GB/T 6379.1-2004 Accuracy(trueness and precision)of measurement methods and results—Part 1:General principles and definitions 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 6730.1-1986 Methods for chemical analysis of iron ores—Preparation of predried test samples for chemical analysis GB/T 6730.1-2016 Iron ores—Preparation of predried test samples for chemical analysis 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 GB/T 10322.1-2000 Iron ores—Sampling and sample preparation procedures GB/T 10322.1-2014 Iron ores—Sampling and sample preparation procedures GB/T 10322.1-2023 Iron ores—Sampling and sample preparation procedures GB/T 12806-1991 Laboratory glassware—One-mark volumetric flasks GB/T 12806-2011 Laboratory glassware—One-mark volumetric flasks GB/T 602-2026 Chemical reagent—Preparations of standard solutions for impurity