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ISO 1693:1976 PDF

ISO 1693:1976 PDF

Name:
ISO 1693:1976 PDF

Published Date:
09/01/1976

Status:
Active

Description:

Cryolite, natural and artificial -- Determination of fluorine content -- Modified Willard-Winter method

Publisher:
International Organization for Standardization

Document status:
Active
Format:
Electronic (PDF)
Delivery time:
10 minutes
Delivery time (for Russian version):
200 business days
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Choose Document Language:
$16.2
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Specifies the determination for natural and synthetic materials having a molar ratio sodium fluoride/aluminium trifluoride between 3 and 1,7 approximately. The principle consists in fusion of a test portion with sodium carbonate, separation of fluorine by distillation with sulphuric acid or perchloric acid. Titration with thorium nitrate solution in presence of sodium alizarinsulphonate/methylene blue as indicator. Alternatively, the thorium nitrate titration may be made using only sodium alizarinsulphonate, the end-point being*spectrophotometrically determined at 525 nm.


File Size : 1 file , 480 KB
Note : This product is unavailable in Ukraine, Russia, Belarus
Number of Pages : 6
Published : 09/01/1976

History

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