CSA Group Cryolite, natural and artificial - Determination of fluorine content - Modified Willard-Winter method ISO 1693:1976

Description
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/m ethylene blue as indicator. Alternatively, the thorium nitrate titration may be made using only sodium alizarinsulphonate, the end-point being*spectrophotome trically determined at 525 nm.
  • Cryolite, natural and artificial - Determination of fluorine content - Modified Willard-Winter method - ISO 1693:1976 - CSA Group
    CSA Group
Description
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/m ethylene blue as indicator. Alternatively, the thorium nitrate titration may be made using only sodium alizarinsulphonate, the end-point being*spectrophotome trically determined at 525 nm.

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Cryolite, natural and artificial - Determination of fluorine content - Modified Willard-Winter method - ISO 1693:1976 - CSA Group
CSA Group
Toronto, Ontario, Canada
Cryolite, natural and artificial - Determination of fluorine content - Modified Willard-Winter method
ISO 1693:1976
Cryolite, natural and artificial - Determination of fluorine content - Modified Willard-Winter method ISO 1693:1976
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/m ethylene blue as indicator. Alternatively, the thorium nitrate titration may be made using only sodium alizarinsulphonate, the end-point being*spectrophotome trically determined at 525 nm.

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.

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Technical Specifications

  CSA Group
Product Category Standards and Technical Documents
Product Number ISO 1693:1976
Product Name Cryolite, natural and artificial - Determination of fluorine content - Modified Willard-Winter method
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