Determination of Tungsten in Ferrotungsten by Thiocyanate Colorimetry

Colorimetry (American English) or Colourimetry (British English; see spelling differences) is "the science and technology used to quantify and describe physically the human color perception." It is similar to spectrophotometry, but is distinguished by its interest in reducing spectra to the physical correlates of color perception, most often the CIE 1931 XYZ color space tristimulus values and related quantities.

According to the characteristic of tungsten being complexed in medium of phosphoric acid, the specimen is reduced via stannous chloride, catalyzed by titanium trichloride, in strongly acidic medium, tungsten and thiocyanate form yellow complex, and then photometric analysis is made.

 

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