ISO 7693:1984 Preview
Ferrotungsten -- Determination of tungsten content -- Cinchonine gravimetric method
This standard was last reviewed and confirmed in 2016. Therefore this version remains current.
The method is applicable to ferrotungsten having tungsten contents between 70 and 90 % (m/m). Specifies principle, reagents, apparatus, sample, procedure, expression of results and test report. It also specifies, in the annex, a spectrometric method for the determination of molybdenum which interferes with the determination.
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