ISO/TR 7955:1982

Ferroniobium -- Determination of niobium content -- Gravimetric method

Specifies a photometric method for the determination of the titanium content (annex A), a gravimetric method for the determination of tantalum contents greater than 1 % (m/m) (annex B) and a photometric method for the determination of tantalum contents less than 1 % (m/m) (annex C). The methods are applicable to ferroniobium having niobium contents between 40 and 75 % (m/m), tantalum contents between 0,25 and 8,0 % (m/m) and titanium contents between 0,05 and 5,0 % (m/m). Interference may arise if bismuth or trivalent antimony are present.


General information

  • Status :  Withdrawn
    Publication date : 1982-12
  • Edition : 1
  • :
    ISO/TC 132
    Ferroalloys
  • 77.100
    Ferroalloys

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