ISO 1620:1976
ISO 1620:1976 Cryolite, natural and artificial – Determination of silica content – Reduced molybdosilicate spectrophotometric method
CDN $76.00
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.
Edition
1
Published Date
1976-09-01
Status
PUBLISHED
Pages
5
Language
English
Format
Secure PDF
Secure – PDF details
- Save your file locally or view it via a web viewer
- Viewing permissions are restricted exclusively to the purchaser
- Device limits - 3
- Printing – Enabled only to print (1) copy
See more about our Environmental Commitment
Abstract
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.
Previous Editions
Can’t find what you are looking for?
Please contact us at:
Related Documents
-
ISO 2831:1973 Sodium fluoride for industrial use – Determination of water-insoluble matter
CDN $76.00 Add to cart -
ISO 2462:1973 Sodium chlorate for industrial use – Determination of moisture content – Gravimetric method
CDN $76.00 Add to cart -
ISO 2833:1973 Sodium fluoride for industrial use – Determination of fluorine content – Modified Willard-Winter method
CDN $76.00 Add to cart -
ISO 3199:1975 Sodium chlorate for industrial use – Determination of chlorate content – Dichromate titrimetric method
CDN $76.00 Add to cart
