ISO 1620:1976

$13.00

Cryolithe, naturelle et artificielle — Dosage de la silice — Méthode spectrophotométrique au molybdosilicate réduit

Published By	Publication Date	Number of Pages
ISO	1976-09	8

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Categories: 71.060.50 - Salts, ISO

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Description

Specifies methods of test for natural and synthetic materials having a molar ratio sodium fluoride/aluminium trifluoride between 3 and 1,7 approximately. The method is applicable to products the phosphorus pentoxide content of which does not exceed 0,02 % (m/m). The procedure consists in alkaline fusion of a test portion by means of a mixture of sodium carbonate and boric acid. Dissolution of the fused mass in excess nitric acid so that the pH value is between 0,7 and 0,9. Formation of the (Yellow) oxidized molybdosilicate under clearly defined conditions of acidity, temperature, time and concentration of reagents. Selective reduction in the presence of tartaric acid and measurement at a wvelength of about 815 nm.

Additional information

Published Code	ISO
Published By	International Organization for Standardization
Publication Date	1976-09
Pages Count	8
Language	France
Edition	1
File Size	1.0 MB
ICS Codes	71.060.50 - Salts

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ISO 1620:1976

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