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ISO 1694:1976

Cryolite, natural and artificial — Determination of iron content — 1,10- Phenanthroline photometric method
1. 9. 1976.

Опште информације

90.60     5. 3. 2026.

ISO

ISO/TC 226

Međunarodni standard

71.060.50  

francuski   engleski  

Kupovina

Objavljen

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Apstrakt

Applies for the determination of natural and synthetic materials having a molar ratio sodium fluoride/aluminium trifluoride between 3 and 1,7 approximately. The method is applicable to products having an iron content equal to or greater than 0,020 % (m/m). The principle consists in dissolution of a test portion by either alkaline or acid fusion. Reduction of iron(III) with hydroxylammonium chloride, formation of the complex iron(II)-1, 10-phenathroline in a buffered medium at pH value between 3,5 and 4,2. Photometric measurement of the coloured complex at a wavelength of about 510 nm. Applies ISO Recommendation R 1694-1970.

Životni ciklus

TRENUTNO

OBJAVLJEN
ISO 1694:1976
90.60 Završetak postupka preispitivanja standarda
5. 3. 2026.

Nacionalna preuzimanja

SRPS H.B8.093:1980  
ISS

Kriolit, prirodni i sintetički - Određivanje sadržaja gvožđa - Fotometrijska metoda

95.99   Povučen

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