ISO 6676:1993

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

Published By	Publication Date	Number of Pages
ISO	1993-03	7

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Categories: 73.080 - Non-metalliferous minerals, ISO

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Description

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).

Additional information

Published Code	ISO
Published By	International Organization for Standardization
Publication Date	1993-03
Pages Count	7
Language	English
Edition	3
File Size	348.2 KB
ICS Codes	73.080 - Non-metalliferous minerals

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ISO 6676:1993

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