GB/T 26416.6-2023
Methods for chemical analysis of rare earth iron alloys - Part 6: Determination of molybdenum, tungsten, titanium content by inductively coupled plasma emission spectrometry (English Version)
- Standard No.
- GB/T 26416.6-2023
- Language
- Chinese, Available in English version
- Release Date
- 2023
- Published By
- General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
- Latest
- GB/T 26416.6-2023
- Scope
- Rare earth iron alloys (lanthanum iron alloy, cerium iron alloy, lanthanum cerium iron alloy, tantalum iron alloy, dysprosium iron alloy, ferroalloy, tantalum iron alloy, yttrium iron alloy)
- Introduction
Interpretation of GB/T 26416.6—2023 National Standard of the People's Republic of China
1. Background and significance of standard formulation
Rare earth iron alloys are important functional materials, widely used in NdFeB permanent magnet materials, magnetostrictive materials and other fields. Chemical composition is its core assessment indicator. GB/T 26416 integrates a number of industry standards and establishes a unified chemical analysis method system. This part (Part 6) focuses on the determination of non-rare earth impurities such as molybdenum, tungsten and titanium, using inductively coupled plasma optical emission spectrometry (ICP-OES), which is accurate, fast and low-cost.
2. Comparative analysis of standard frameworks
Standard part Determination object Scope of application Core method Part 1 Total amount of rare earth elements Total content of rare earth elements such as lanthanum and cerium Volumetric method Part 2 Rare earth impurities Rare earth purity assessment ICP-OES Part 3 Calcium, magnesium, etc. Analysis of non-rare earth impurities ICP-OES 3. Recommendations for the implementation of the standard
3.1 Instrument selection and calibration
It is recommended to use ICP-OES equipment with a resolution of less than 0.006 nm (at 200 nm) and an RSD of no more than 1.5%. It is recommended to calibrate the instrument regularly to ensure its stability and accuracy.
3.2 Sample pretreatment optimization
Note when preparing samples:
- Break the block sample into crumbs or granules to avoid oxidation.
- The weighing accuracy is 0.0001 g.
- Control the amount of nitric acid and hydrofluoric acid during the dissolution process to prevent the rare earth matrix from over-suppressing the signal intensity.
GB/T 26416.6-2023 Referenced Document
- GB/T 6682 Water for analytical laboratory use.Specification and test methods
- GB/T 8170 Rules of rounding off for numerical values & expression and judgement of limiting values
GB/T 26416.6-2023 history
- 2023 GB/T 26416.6-2023 Methods for chemical analysis of rare earth iron alloys - Part 6: Determination of molybdenum, tungsten, titanium content by inductively coupled plasma emission spectrometry