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ISO 6676:1993

Acid-grade and ceramic-grade fluorspar -- Determination of total phosphorus content -- Reduced-molybdophosphate spectrometric method

General information
Withdrawn from 03.03.2010
Directives or regulations
None
Standard history
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Date
Type
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ISO 6676:1981
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ISO 6676:1990
The method specified is based on dissolution of a test portion by fusion with a mixture of sodium carbonate, boric acid and sodium nitrate and subsequent acidification with nitric acid, formation of the molybdophosphate complex and extraction with a mixture of ethyl acetate and butyl acetate, followed by selective reduction of the complex to molybdenum blue by means of tin(II) chloride added to the organic phase, spectrometric measurement of the absorbance of the coloured complex at the wavelength of maximum absorption (about 710 nm). Applies to products having total phosphorus contents, expressed as PO4^3-, in the range 0,01 % (m/m) to 1,0 % (m/m).
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