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ISO 4280:1977

Cryolite, natural and artificial, and aluminium fluoride for industrial use — Determination of sulphate content — Barium sulphate gravimetric method
1. 11. 1977.

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

Applicable to products having a content, expressed as sulphur trioxide, equal to or more than 0.1 % (m/m). Bases on alkaline fusion of a test portion with a mixture of sodium carbonate and boric acid. Extraction of the fused mass with perchloric acid solution and precipitation of the sulphate ions with barium chloride in an acidified medium. Filtration on a fine-texture, ashless filter paper (pore diameter approximately 0.4 to 1.0 m). Calcination after drying in an electric oven at (850 20) °C. Weighing of the residue.

Životni ciklus

TRENUTNO

OBJAVLJEN
ISO 4280:1977
90.60 Završetak postupka preispitivanja standarda
5. 3. 2026.

Nacionalna preuzimanja

SRPS H.B8.127:1980  
ISS

Kriolit, prirodni i sintetički - Određivanje sadržaja sulfata - Gravimetrijska metoda

95.99   Povučen

B082 Saznaj više

SRPS H.B8.192:1979  
ISS

Aluminijum-fluorid, tehnički - Određivanje sadržaja sulfata - Gravimetrijska metoda

95.99   Povučen

B082 Saznaj više