ISO 2369:1972

$12.35

Aluminium fluoride for industrial use — Determination of silica content — Spectrophotometric method using the reduced silicomolybdic complex

Published By	Publication Date	Number of Pages
ISO	1972-12	6

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Categories: 71.060.50 - Salts, ISO

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Description

The method can be applied provided the phosphorus pentoxide content does not exceed 0,02 % (m/m). The principle is based on alkaline fusion of a test portion by means of a mixture of sodium carbonate and boric acid. Solution of the fused mass in excess nitric acid so that the pH of the final solution is between 0,3 and 0,5 after being diluted. Formation, in a suitable aliquot portion, of the (yellow) oxidized silicomolybdic complex under clearly defined conditions of acidity, concentration of reagents, temperature and time. Selective reduction in a high acidity sulphuric acid medium and in the presence of tartaric acid. Spectrophotometric measurement at a wavelength of about 815 nm.

Additional information

Published Code	ISO
Published By	International Organization for Standardization
Publication Date	1972-12
Pages Count	6
Language	English
Edition	1
File Size	368.6 KB
ICS Codes	71.060.50 - Salts

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ISO 2369:1972

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