GB/T 7731.1-2021
Ferrotungsten—Determination of tungsten content—Cinchonine gravimetric method and ammonium nitrate gravimetric method (English Version)

Standard No.
GB/T 7731.1-2021
Language
Chinese, Available in English version
Release Date
2021
Published By
国家市场监督管理总局、中国国家标准化管理委员会
Latest
GB/T 7731.1-2021
Replace
GB/T 7731.1-1987
Scope
This document specifies the cinchonine gravimetric method and the ammonium nitrate gravimetric method for the determination of tungsten content in ferrotungsten. This document is applicable to the determination of tungsten content in ferrotungsten. Measuring range (mass fraction): 50.00%~90.00%.

GB/T 7731.1-2021 Referenced Document

  • GB/T 4010 Ferroallys sampling and preparation of samples for chemical analysis
  • 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 7731.1-2021 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
Ferrotungsten—Determination of tungsten content—Cinchonine gravimetric method and ammonium nitrate gravimetric method

GB/T 7731.1-2021 -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 Determination of tungsten cobalt, nickel and aluminum content by inductively coupled plasma atomic emission spectrometry 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


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