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ISO 1693:1976

Cryolite, natural and artificial — Determination of fluorine content — Modified Willard-Winter method
1. 9. 1976.

Опште информације

90.60     5. 3. 2026.

ISO

ISO/TC 226

Međunarodni standard

71.060.50  

francuski   engleski  

Kupovina

Objavljen

Jezik na kome želite da primite dokument.

Apstrakt

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.

Životni ciklus

TRENUTNO

OBJAVLJEN
ISO 1693:1976
90.60 Završetak postupka preispitivanja standarda
5. 3. 2026.

Nacionalna preuzimanja

SRPS H.B8.092:1980  
ISS

Kriolit, prirodni i sintetički - Određivanje sadržaja fluora - Volumetrijska metoda

95.99   Povučen

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