GB/T 7731.1-1987
Methods for chemical analysis of ferrotungsten--The cinchonine gravimetric method for the determination of tungsten content (English Version)
- Standard No.
- GB/T 7731.1-1987
- Language
- Chinese, Available in English version
- Release Date
- 1987
- Published By
- General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
- Status
- 2022-03
- Replace By
- GB/T 7731.1-2021
- Latest
- GB/T 7731.1-2021
- Scope
- This standard applies to the determination of tungsten content in ferrotungsten. Measuring range: greater than 65%. Since molybdenum interferes with the determination of tungsten, the method for determining the amount of aluminum is given in the appendix.
GB/T 7731.1-1987 history
- 2021 GB/T 7731.1-2021 Ferrotungsten—Determination of tungsten content—Cinchonine gravimetric method and ammonium nitrate gravimetric method
- 1987 GB/T 7731.1-1987 Methods for chemical analysis of ferrotungsten--The cinchonine gravimetric method for the determination of tungsten content
GB/T 7731.1-1987 -All Parts
GB/T 7731.1-2021 Ferrotungsten—Determination of tungsten content—Cinchonine gravimetric method and ammonium nitrate gravimetric method
GB/T 7731.10-2021 Ferrotungsten—Determination of carbon content—Infrared absorption method
GB/T 7731.12-2008 Ferrotungsten. Determination of sulfur content. Infrared absorption method and combustion titration method
GB/T 7731.13-1988 Methods for chemical analysis of ferrotungsten--The combustion-neutralization titration method for the determination of sulfur content
GB/T 7731.14-2008 Ferrotungsten. Determination of lead content. The polarographic method and inductively coupled plasma-atomic emission spectrometry
GB/T 7731.15-1999 Methods for chemical analysis of ferrotungsten-The flame atomic absorption spectrometric method for the determination of copper content
GB/T 7731.16-1999 Methods for chemical analysis of ferrotungsten-The flame atomic absorption spectrometric method for the determination of manganese content
GB/T 7731.17-2023
GB/T 7731.2-2007 Ferrotungsten-Determination of manganese content-The periodate spectrophotometric method and the flame atomic absorption spectrometric method
GB/T 7731.3-2008 Ferrotungsten. Determination of copper content. Bis(cyclohexanone) oxalyldihydrazone photometric method and flame atomic absorption spectrometric method
GB/T 7731.4-2021 Ferrotungsten—Determination of phosphorus content—Phosphorus molybdenum blue spectrophotometric method
GB/T 7731.5-2021 Ferrotungsten—Determination of silicon content—Silicomolybdenum blue spectrophotometric method
GB/T 7731.6-2008 Ferrotungsten.Determination of arsenic content.The molybdenum blue photometrie method and inductively coupled plasma-atomic emission spectrometry
GB/T 7731.7-2008 Ferrotungsten. Determination of tin content. Phenylfluorone photometric method and inductively coupled plasma-atomic emission spectrometry
GB/T 7731.8-2008 Ferrotungsten.Determination of antimony content.The tetraethlrhodamine photometrie method and inductively couple plasma-atomic mission spectrometry
GB/T 7731.9-2008 Ferrotungsten.Determination of bismuth content.The bismuth iodide photonmetric method and inductively coupled plasma-atomic emission spectrometry